Holtek HT66F0175 User manual

A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
Revision: V1.50 Date: August 28, 2017August 28, 2017

Rev. 1.50 2 August 28, 2017 Rev. 1.50 3 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Table of Contents
Features................................................................................................................ 7
CPU Features ..............................................................................................................................7
Peripheral Features......................................................................................................................7
General Description............................................................................................. 8
Selection Table..................................................................................................... 8
Block Diagram...................................................................................................... 9
Pin Assignment.................................................................................................... 9
Pin Descriptions ................................................................................................ 11
Absolute Maximum Ratings.............................................................................. 17
D.C. Characteristics........................................................................................... 17
A.C. Characteristics........................................................................................... 19
HIRC Electrical Characteristics ........................................................................ 20
A/D Converter Electrical Characteristics......................................................... 21
LVD/LVR Electrical Characteristics.................................................................. 22
Comparator Electrical Characteristics ............................................................ 22
Software Controlled LCD Driver Electrical Characteristics........................... 23
Power-on Reset Characteristics....................................................................... 23
System Architecture.......................................................................................... 24
Clocking and Pipelining..............................................................................................................24
Program Counter........................................................................................................................25
Stack ..........................................................................................................................................26
Arithmetic and Logic Unit – ALU ................................................................................................26
Flash Program Memory..................................................................................... 27
Structure.....................................................................................................................................27
Special Vectors ..........................................................................................................................27
Look-up Table.............................................................................................................................28
Table Program Example.............................................................................................................28
In Circuit Programming – ICP ....................................................................................................29
On-Chip Debug Support – OCDS ..............................................................................................30
Data Memory ...................................................................................................... 31
Structure.....................................................................................................................................31
Special Function Register Description............................................................ 33
Indirect Addressing Registers – IAR0, IAR1 ..............................................................................33
Memory Pointers – MP0, MP1 ...................................................................................................33
Bank Pointer – BP......................................................................................................................34
Accumulator – ACC....................................................................................................................34
Program Counter Low Register – PCL.......................................................................................34
Look-up Table Registers – TBLP, TBHP, TBLH..........................................................................34
Status Register – STATUS.........................................................................................................35

Rev. 1.50 2 August 28, 2017 Rev. 1.50 3 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
EEPROM Data Memory...................................................................................... 37
EEPROM Data Memory Structure .............................................................................................37
EEPROM Registers ...................................................................................................................37
Reading Data from the EEPROM ..............................................................................................39
Writing Data to the EEPROM.....................................................................................................39
Write Protection..........................................................................................................................39
EEPROM Interrupt .....................................................................................................................39
Programming Considerations.....................................................................................................40
Oscillator ............................................................................................................ 41
Oscillator Overview ....................................................................................................................41
System Clock Congurations.....................................................................................................41
External Crystal/Ceramic Oscillator – HXT ................................................................................42
Internal High Speed RC Oscillator – HIRC ................................................................................43
External 32.768 kHz Crystal Oscillator – LXT ............................................................................43
Internal 32kHz Oscillator – LIRC................................................................................................44
Supplementary Oscillators .........................................................................................................44
Operating Modes and System Clocks ............................................................. 45
System Clocks ...........................................................................................................................45
System Operation Modes...........................................................................................................46
Control Registers .......................................................................................................................47
Fast Wake-up .............................................................................................................................49
Operating Mode Switching .........................................................................................................50
Standby Current Considerations ................................................................................................54
Wake-up.....................................................................................................................................54
Programming Considerations.....................................................................................................55
Watchdog Timer................................................................................................. 55
Watchdog Timer Clock Source...................................................................................................55
Watchdog Timer Control Register ..............................................................................................55
Watchdog Timer Operation ........................................................................................................57
Reset and Initialisation...................................................................................... 58
Reset Functions .........................................................................................................................58
Reset Initial Conditions ..............................................................................................................60
Input/Output Ports ............................................................................................. 64
Pull-high Resistors .....................................................................................................................65
Port A Wake-up ..........................................................................................................................65
I/O Port Control Registers ..........................................................................................................66
I/O Port Source Current Control.................................................................................................66
Pin-remapping Functions ...........................................................................................................68
I/O Pin Structures.......................................................................................................................69
Programming Considerations.....................................................................................................70

Rev. 1.50 4 August 28, 2017 Rev. 1.50 5 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Timer Modules – TM .......................................................................................... 71
Introduction ................................................................................................................................71
TM Operation .............................................................................................................................71
TM Clock Source........................................................................................................................72
TM Interrupts..............................................................................................................................72
TM External Pins........................................................................................................................72
TM Input/Output Pin Control Register ........................................................................................73
Programming Considerations.....................................................................................................75
Compact Type TM – CTM .................................................................................. 76
Compact TM Operation..............................................................................................................76
Compact Type TM Register Description.....................................................................................77
Compact Type TM Operation Modes .........................................................................................81
Standard Type TM – STM .................................................................................. 87
Standard TM Operation..............................................................................................................87
Standard Type TM Register Description ....................................................................................88
Standard Type TM Operation Modes .........................................................................................92
Periodic Type TM – PTM.................................................................................. 102
Periodic TM Operation .............................................................................................................102
Periodic Type TM Register Description....................................................................................103
Periodic Type TM Operation Modes.........................................................................................108
Analog to Digital Converter ............................................................................ 117
A/D Overview ........................................................................................................................... 117
A/D Converter Register Description ......................................................................................... 118
A/D Input Pins ..........................................................................................................................124
A/D Reference Voltage.............................................................................................................124
A/D Operation ..........................................................................................................................124
Conversion Rate and Timing Diagram .....................................................................................125
Summary of A/D Conversion Steps..........................................................................................126
Programming Considerations...................................................................................................127
A/D Transfer Function ..............................................................................................................127
A/D Programming Examples....................................................................................................128
Serial Interface Module – SIM ......................................................................... 130
SPI Interface ............................................................................................................................130
SPI Registers ...........................................................................................................................131
SPI Communication .................................................................................................................134
I2C Interface .............................................................................................................................136
I2C Registers ............................................................................................................................137
I2C Bus Communication ...........................................................................................................141
I2C Time-out Control.................................................................................................................144

Rev. 1.50 4 August 28, 2017 Rev. 1.50 5 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Comparators .................................................................................................... 146
Comparator Operation .............................................................................................................146
Comparator Interrupt................................................................................................................146
Programming Considerations...................................................................................................146
SCOM/SSEG Function for LCD....................................................................... 148
LCD Operation .........................................................................................................................148
LCD Control Registers .............................................................................................................150
UART Interface................................................................................................. 155
UART External Pin ...................................................................................................................156
UART Data Transfer Scheme...................................................................................................156
UART Status and Control Registers.........................................................................................156
Baud Rate Generator ...............................................................................................................162
UART Setup and Control..........................................................................................................163
UART Transmitter.....................................................................................................................164
UART Receiver ........................................................................................................................165
Managing Receiver Errors .......................................................................................................167
UART Interrupt Structure..........................................................................................................168
UART Power Down and Wake-up............................................................................................169
Low Voltage Detector – LVD ........................................................................... 170
LVD Register ............................................................................................................................170
LVD Operation..........................................................................................................................171
Interrupts .......................................................................................................... 172
Interrupt Registers....................................................................................................................172
Interrupt Operation ...................................................................................................................179
External Interrupt......................................................................................................................181
Comparator Interrupt – HT66F0185.........................................................................................181
Multi-function Interrupt .............................................................................................................181
A/D Converter Interrupt ............................................................................................................182
Time Base Interrupt..................................................................................................................182
Serial Interface Module Interrupt..............................................................................................183
UART Transfer Interrupt – HT66F0185....................................................................................183
LVD Interrupt ............................................................................................................................184
EEPROM Interrupt ...................................................................................................................184
TM Interrupt..............................................................................................................................184
Interrupt Wake-up Function......................................................................................................185
Programming Considerations...................................................................................................185
Conguration Options..................................................................................... 186
Application Circuits......................................................................................... 186

Rev. 1.50 6 August 28, 2017 Rev. 1.50 7 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Instruction Set.................................................................................................. 187
Introduction ..............................................................................................................................187
Instruction Timing .....................................................................................................................187
Moving and Transferring Data..................................................................................................187
Arithmetic Operations...............................................................................................................187
Logical and Rotate Operation ..................................................................................................188
Branches and Control Transfer ................................................................................................188
Bit Operations ..........................................................................................................................188
Table Read Operations ............................................................................................................188
Other Operations......................................................................................................................188
Instruction Set Summary ................................................................................ 189
Table Conventions....................................................................................................................189
Instruction Denition....................................................................................... 191
Package Information ....................................................................................... 200
20-pin SOP (300mil) Outline Dimensions ................................................................................201
20-pin SSOP (150mil) Outline Dimensions ..............................................................................202
24-pin SOP (300mil) Outline Dimensions ................................................................................203
24-pin SSOP (150mil) Outline Dimensions ..............................................................................204
28-pin SOP (300mil) Outline Dimensions ................................................................................205
28-pin SSOP (150mil) Outline Dimensions ..............................................................................206

Rev. 1.50 6 August 28, 2017 Rev. 1.50 7 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Features
CPU Features
• Operatingvoltage

♦fSYS=8MHz:2.2V~5.5V

♦fSYS=12MHz:2.7V~5.5V

♦fSYS=20MHz:4.5V~5.5V
• Upto0.2μsinstructioncyclewith20MHzsystemclockatVDD=5V
• Powerdownandwake-upfunctionstoreducepowerconsumption
• Oscillatortype

♦ExternalHighSpeedCrystal–HXT

♦External32.768kHzCrystal–LXT

♦InternalHighSpeedRC–HIRC

♦Internal32kHzRC–LIRC
• Fullyintegratedinternal8/12/16MHzoscillatorrequiresnoexternalcomponents
• Multi-modeoperation:NORMAL,SLOW,IDLEandSLEEP
• Allinstructionsexecutedinonetotwoinstructioncycles
• Tablereadinstructions
• 63powerfulinstructions
• 8-levelsubroutinenesting
• Bitmanipulationinstruction
Peripheral Features
• ProgramMemory:Upto4K×16
• DataMemory:Upto256×8
• TrueEEPROMMemory:Upto128×8
• WatchdogTimerfunction
• Upto26bidirectionalI/Olines
• TwoexternalinterruptlinessharedwithI/Opins
• MultipleTimerModulesfortimemeasure,inputcapture,comparematchoutput,PWMoutput
functionorsinglepulseoutputfunction
• SerialInterfacesModule–SIMforSPIorI2C
• Softwarecontrolled6-SCOM/SSEGand18-SSEGlinesLCDdriverwith1/3bias
• ProgrammableI/OportsourcecurrentforLEDapplications
• DualTime-Basefunctionsforgenerationofxedtimeinterruptsignals
• 8-channel12-bitresolutionA/Dconverter
• OneComparatorfunction–availableinHT66F0185
• Fully-duplexUniversalAsynchronousReceiverandTransmitterInterface–UART,availablein
HT66F0185
• Lowvoltageresetfunction
• Lowvoltagedetectfunction
• Flashprogrammemorycanbere-programmedupto100,000times
• Flashprogrammemorydataretention>10years
• TrueEEPROMdatamemorycanbere-programmedupto1,000,000times
• TrueEEPROMdatamemorydataretention>10years
• Widerangeofavailablepackagetypes

Rev. 1.50 8 August 28, 2017 Rev. 1.50 9 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
General Description
TheseriesofdevicesareFlashMemoryA/Dtype8-bithighperformanceRISCarchitecture
microcontroller.OfferinguserstheconvenienceofFlashMemorymulti-programmingfeatures,
thesedevicesalsoincludeawiderangeoffunctionsandfeatures.Othermemoryincludesanarea
ofRAMDataMemoryaswellasanareaoftrueEEPROMmemoryforstorageofnon-volatiledata
suchasserialnumbers,calibratuibdata,etc.
Analogfeaturesincludeamulti-channel12-bitA/Dconverterandacomparatorfunctions.Multiple
andextremelyflexibleTimerModulesprovidetiming,pulsegenerationandPWMgeneration
functions.ProtectivefeaturessuchasaninternalWatchdogTimer,LowVoltageResetandLow
VoltageDetectorcoupledwithexcellentnoiseimmunityandESDprotectionensurethatreliable
operationismaintainedinhostileelectricalenvironments.AfullchoiceofHXT,LXT,HIRCand
LIRCoscillatorfunctionsareprovidedincludingafullyintegratedsystemoscillatorwhichrequires
noexternalcomponentsforitsimplementation.Theabilitytooperateandswitchdynamically
betweenarangeofoperatingmodesusingdifferentclocksourcesgivesuserstheabilitytooptimise
microcontrolleroperationandminimizepowerconsumption.
TheinclusionofexibleI/Oprogrammingfeatures,Time-Basefunctionsalongwithmanyother
featuresensurethatthedeviceswillndexcellentuseinapplicationssuchaselectronicmetering,
environmentalmonitoring,handheldinstruments,householdappliances,electronicallycontrolled
tools,motordrivinginadditiontomanyothers.
Selection Table
Mostfeaturesarecommontoalldevices.ThemainfeaturesdistinguishingthemareMemory
capacity,I/Ocount,TimerModulefeatures,SSEGcount,LEDcount,UARTandpackagetypes.The
followingtablesummarisesthemainfeaturesofeachdevice.
Part No. Program
Memory
Data
Memory
Data
EEPROM I/O External Interrupt A/D Timer Module
HT66F0175 2k × 16 128 × 8 64 × 8 22 2 12-bit × 8 10-bit PTM × 2
HT66F0185 4k × 16 256 × 8 128 × 8 26 2 12-bit × 8
16-bit CTM × 1
16-bit STM × 1
10-bit PTM × 1
Part No. Time
Base SIM UART CMP SCOM/ SSEG SSEG LED Stack Package
HT66F0175 2 √— — 6 14 22 8 20/24SOP/SSOP
HT66F0185 2 √ √ √ 6 18 26 8 24/28SOP/SSOP
Note:Asdevicesexistinmorethanonepackageformat,thetablereectsthesituationforthepackagewith
themostpins.

Rev. 1.50 8 August 28, 2017 Rev. 1.50 9 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Block Diagram
8-bit
RISC
MCU
Core
I/O Timer
Modules
Flash
Program
Memory
EEPROM
Data
Memory
Flash/EEPROM
Programming Circuitry
Time
Base
SIM
(SPI/I2C)
Low
Voltage
Reset
Watchdog
Timer
Low
Voltage
Detect
Interrupt
Controller
Reset
Circuit
External
HXT/LXT
Oscillators
12-bit A/D
Converter
RAM Data
Memory
SSEG/
SCOM UART
Internal
HIRC/LIRC
Oscillators
For HT66F0185
+
─
For HT66F0185
Comparator
Pin Assignment
HT66F0175/HT66V0175
20 SOP-A/SSOP-A
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
VSS&AVSS
PC0/SSEG17/OSC1
PC1/SSEG18/OSC2
PC2/SDO/SSEG0/SCOM0
PA0/TP0/ICPDA/OCDSDA
PA2/ICPCK/OCDSCK
PA3/[SDI/SDA]/SSEG3/SCOM3
PB6/[SCK/SCL]/SSEG4/SCOM4
PA1/[SDO]/SCS/SSEG2/SCOM2
PB5/[SCS]/SSEG5/SCOM5
VDD&AVDD
PB0/INT0/SSEG16/AN0/XT1
PB1/INT1/SSEG15/AN1/XT2
PB2/TCK0/SSEG14/AN2
PA4/TCK1/SSEG13/AN3
PA5/SSEG10/AN4/VREFI
PA6/SSEG9/AN5/VREF
PA7/TP1/SSEG8/AN6
PB3/SSEG7/AN7
PB4/CLO/SSEG6

Rev. 1.50 10 August 28, 2017 Rev. 1.50 11 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66V0175
24 SOP-A/SSOP-A
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
VDD&AVDD
PB0/INT0/SSEG16/AN0/XT1
PB1/INT1/SSEG15/AN1/XT2
PB2/TCK0/SSEG14/AN2
PA4/TCK1/SSEG13/AN3
PA5/SSEG10/AN4/VREFI
PA6/SSEG9/AN5/VREF
PA7/TP1/SSEG8/AN6
PB3/SSEG7/AN7
PB4/CLO/SSEG6
PC5/[INT1]/SSEG11
PC6/[INT0]/SSEG12
VSS&AVSS
PC0/SSEG17/OSC1
PC1/SSEG18/OSC2
PC2/SDO/SSEG0/SCOM0
PA0/TP0/ICPDA/OCDSDA
PA1/[SDO]/SCS/SSEG2/SCOM2
PA2/ICPCK/OCDSCK
PA3/[SDI/SDA]/SSEG3/SCOM3
PB6/[SCK/SCL]/SSEG4/SCOM4
PB5/[SCS]/SSEG5/SCOM5
PC3/SDI/SDA/SSEG19
PC4/SCK/SCL/SSEG1/SCOM1
HT66F0185/HT66V0185
24 SOP-A/SSOP-A
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
VDD&AVDD
PB0/INT0/SSEG18/AN0/XT1
PB1/INT1/SSEG17/AN1/XT2
PB2/TCK0/SSEG16/AN2
PA4/TCK1/SSEG15/AN3
PA5/SSEG10/AN4/VREFI
PA6/TCK2/SSEG9/AN5/VREF
PA7/TP1/SSEG8/AN6
PB3/[TX]/TP2/SSEG7/AN7
PB4/[RX]/CLO/SSEG6
PD1/RX/SSEG12
PD2/TX/SSEG13
VSS&AVSS
PC0/SSEG19/OSC1
PC1/SSEG20/OSC2
PC2/[SDO]/SSEG0/SCOM0
PA0/TP0/ICPDA/OCDSDA
PA1/[SDO]/SSEG2/SCOM2
PA2/ICPCK/OCDSCK
PA3/[SDI/SDA]/CX/SSEG3/SCOM3
PB6/[SCK/SCL]/C+/SSEG4/SCOM4
PB5/[SCS]/C-/SSEG5/SCOM5
PC4/SDI/SDA/SSEG22
PC5/SCK/SCL/SSEG1/SCOM1
HT66F0185/HT66V0185
28 SOP-A/SSOP-A
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VDD&AVDD
PB0/INT0/SSEG18/AN0/XT1
PB1/INT1/SSEG17/AN1/XT2
PB2/TCK0/SSEG16/AN2
PA4/TCK1/SSEG15/AN3
PA5/SSEG10/AN4/VREFI
PA6/TCK2/SSEG9/AN5/VREF
PA7/TP1/SSEG8/AN6
PB3/[TX]/TP2/SSEG7/AN7
PB4/[RX]/CLO/SSEG6
PD0/SSEG11
PD1/RX/SSEG12
PD2/TX/SSEG13
PD3/SSEG14
VSS&AVSS
PC0/SSEG19/OSC1
PC1/SSEG20/OSC2
PC2/[SDO]/SSEG0/SCOM0
PA0/TP0/ICPDA/OCDSDA
PA1/[SDO]/SSEG2/SCOM2
PA2/ICPCK/OCDSCK
PA3/[SDI/SDA]/CX/SSEG3/SCOM3
PB6/[SCK/SCL]/C+/SSEG4/SCOM4
PB5/[SCS]/C-/SSEG5/SCOM5
PC3/SDO/SSEG21
PC4/SDI/SDA/SSEG22
PC5/SCK/SCL/SSEG1/SCOM1
PC6/SCS/SSEG23
Note:1.Ifthepin-sharedpinfunctionshavemultipleoutputssimultaneously,itspinnamesattherightsideofthe“/”
signcanbeusedforhigherpriority.
2.VDD&AVDDmeanstheVDDandAVDDarethedoublebonding.
3.VSS&AVSSmeanstheVSSandAVSSarethedoublebonding.
4.TheOCDSDAandOCDSCKpinsaretheOCDSdedicatedpinsandonlyavailablefortheHT66V01x5
devicewhichistheOCDSEVchipfortheHT66F01x5device.

Rev. 1.50 10 August 28, 2017 Rev. 1.50 11 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pin Descriptions
Withtheexceptionofthepowerpins,allpinsonthesedevicescanbereferencedbytheirPortname,
e.g.PA0,PA1etc,whichrefertothedigitalI/Ofunctionofthepins.HoweverthesePortpinsare
alsosharedwithotherfunctionsuchastheAnalogtoDigitalConverter,TimerModulepins,etc.
Thefunctionofeachpinislistedinthefollowingtable,howeverthedetailsbehindhoweachpinis
congurediscontainedinothersectionsofthedatasheet.
HT66F0175
Pad Name Function OPT I/T O/T Description
PA0/TP0/ICPDA/
OCDSDA
PA0 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TP0 TMPC ST CMOS TM0 input/output
ICPDA — ST CMOS ICP Data/Address pin
OCDSDA — ST CMOS OCDS Data/Address pin, for EV chip only.
PA1/[SDO]/SCS/
SSEG2/SCOM2
PA1 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
[SDO]
SLCDC0
SIMC0
IFS
— CMOS SPI data output
SCS SLCDC0
SIMC0 IFS ST CMOS SPI slave select
SSEG2 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM2 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PA2/ICPCK/
OCDSCK
PA2 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
ICPCK — ST CMOS ICP Clock pin
OCDSCK — ST — OCDS Clock pin, for EV chip only.
PA3/[SDI/SDA]/
SSEG3/SCOM3
PA3 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
[SDI]
SLCDC0
SIMC0
IFS
ST — SPI data input
[SDA]
SLCDC0
SIMC0
IFS
ST NMOS I2C address/data line
SSEG3 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM3 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PA4/TCK1/
SSEG13/AN3
PA4 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TCK1 TM1C0 ST — TM1 input
SSEG13 SLCDC2 — SSEG Software controlled LCD segment output
AN3 ACERL AN — A/D Converter analog input
PA5/SSEG10/
AN4/VREFI
PA5 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
SSEG10 SLCDC2 — SSEG Software controlled LCD segment output
AN4 ACERL AN — A/D Converter analog input
VREFI SADC2 AN — A/D Converter PGA voltage input

Rev. 1.50 12 August 28, 2017 Rev. 1.50 13 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pad Name Function OPT I/T O/T Description
PA6/SSEG9/AN5/
VREF
PA6 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
SSEG9 SLCDC2 — SSEG Software controlled LCD segment output
AN5 ACERL AN — A/D Converter analog input
VREF SADC2 — AO A/D Converter reference voltage output
PA7/TP1/SSEG8/
AN6
PA7 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TP1 TMPC ST CMOS TM1 input/output
SSEG8 SLCDC2 — SSEG Software controlled LCD segment output
AN6 ACERL AN — A/D Converter analog input
PB0/INT0/
SSEG16/AN0/XT1
PB0 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
INT0 IFS
INTEG ST — External Interrupt 0
SSEG16 SLCDC3 — SSEG Software controlled LCD segment output
AN0 ACERL AN — A/D Converter analog input
XT1 CO LXT — LXT oscillator pin
PB1/INT1/
SSEG15/AN1/XT2
PB1 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
INT1 IFS
INTEG ST — External Interrupt 1
SSEG15 SLCDC3 — SSEG Software controlled LCD segment output
AN1 ACERL AN — A/D Converter analog input
XT2 CO — LXT LXT oscillator pin
PB2/TCK0/
SSEG14/AN2
PB2 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
TCK0 TM0C0 ST — TM0 input
SSEG14 SLCDC3 — SSEG Software controlled LCD segment output
AN2 ACERL AN — A/D Converter analog input
PB3/SSEG7/AN7
PB3 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG7 SLCDC2 — SSEG Software controlled LCD segment output
AN7 ACERL AN — A/D Converter analog input
PB4/CLO/SSEG6
PB4 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
CLO TMPC — CMOS System clock output
SSEG6 SLCDC2 — SSEG Software controlled LCD segment output
PB5/[SCS]/
SSEG5/SCOM5
PB5 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[SCS]
SLCDC0
SIMC0
IFS
— CMOS SPI slave select
SSEG5 SLCDC1 — SSEG Software controlled LCD segment output
SCOM5 SLCDC1 — SCOM Software controlled LCD common output
PB6/[SCK/SCL]/
SSEG4/SCOM4
PB6 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[SCK] SIMC0
IFS ST CMOS SPI serial clock
[SCL] SIMC0
IFS ST NMOS I2C clock line
SSEG4 SLCDC1 — SSEG Software controlled LCD segment output
SCOM4 SLCDC1 — SCOM Software controlled LCD common output
PC0/SSEG17/
OSC1
PC0 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG17 SLCDC3 — SSEG Software controlled LCD segment output
OSC1 CO HXT — HXT oscillator pin
PC1/SSEG18/
OSC2
PC1 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG18 SLCDC3 — SSEG Software controlled LCD segment output
OSC2 CO — HXT HXT oscillator pin

Rev. 1.50 12 August 28, 2017 Rev. 1.50 13 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pad Name Function OPT I/T O/T Description
PC2/SDO/SSEG0/
SCOM0
PC2 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SDO SIMC0
IFS — CMOS SPI data output
SSEG0 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM0 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PC3/SDI/SDA/
SSEG19
PC3 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SDI SIMC0
IFS ST — SPI data input
SDA SIMC0
IFS ST NMOS I2C data line
SSEG19 SLCDC3 — SSEG Software controlled LCD segment output
PC4/SCK/SCL/
SSEG1/SCOM1
PC4 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SCK SIMC0
IFS ST CMOS SPI serial clock
SCL SIMC0
IFS ST NMOS I2C clock line
SSEG1 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM1 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PC5/[INT1]/
SSEG11
PC5 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
[INT1] INTEG
IFS ST — External Interrupt 1
SSEG11 SLCDC2 — SSEG Software controlled LCD segment output
PC6/[INT0]/
SSEG12
PC6 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
[INT0] INTEG
IFS ST — External Interrupt 0
SSEG12 SLCDC2 — SSEG Software controlled LCD segment output
VDD&AVDD VDD — PWR — Positive power supply
AVDD — PWR — A/D converter positive power supply
VSS&AVSS VSS — PWR — Negative power supply, ground.
AVSS — PWR — A/D converter negative power supply, ground.
Note:I/T:Inputtype;  O/T:Outputtype;
OPT:Optionalbycongurationoption(CO)orregisteroption;
CO:Congurationoption; ST:SchmittTriggerinput; AN:Analoginput;
CMOS:CMOSoutput; NMOS:NMOSoutput; AO:Analogoutput;
SSEG:SoftwarecontrolledLCDSEG;   SCOM:SoftwarecontrolledLCDCOM;
HXT:Highfrequencycrystaloscillator;   LXT:Lowfrequencycrystaloscillator
PWR:Power
*TheAVDDpinisinternallybondedtogetherwiththeVDDpinwhiletheAVSSpinisinternallybonded
togetherwiththeVSSpin.
AsthePinDescriptionSummarytableappliestothepackagetypewiththemostpins,notalloftheabovelisted
pinsmaybepresentonpackagetypeswithsmallernumbersofpins.
HT66F0185
Pad Name Function OPT I/T O/T Description
PA0/TP0/ICPDA/
OCDSDA
PA0 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TP0 TMPC ST CMOS TM0 input/output
ICPDA — ST CMOS ICP Data/Address pin
OCDSDA — ST CMOS OCDS Data/Address pin, for EV chip only.

Rev. 1.50 14 August 28, 2017 Rev. 1.50 15 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pad Name Function OPT I/T O/T Description
PA1/[SDO]/SSEG2/
SCOM2
PA1 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
[SDO]
SLCDC0
SIMC0
IFS
— CMOS SPI data output
SSEG2 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM2 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PA2/ICPCK/
OCDSCK
PA2 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
ICPCK — ST CMOS ICP Clock pin
OCDSCK — ST — OCDS Clock pin, for EV chip only.
PA3/[SDI/SDA]/CX/
SSEG3/SCOM3
PA3 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
[SDI]
SLCDC0
SIMC0
IFS
ST — SPI data input
[SDA]
SLCDC0
SIMC0
IFS
ST NMOS I2C address/data line
CX CPC — CMOS Comparator output
SSEG3 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM3 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PA4/TCK1/
SSEG15/AN3
PA4 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TCK1 TM1C0 ST — TM1 input
SSEG15 SLCDC3 — SSEG Software controlled LCD segment output
AN3 ACERL AN — A/D Converter analog input
PA5/SSEG10/AN4/
VREFI
PA5 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
SSEG10 SLCDC2 — SSEG Software controlled LCD segment output
AN4 ACERL AN — A/D Converter analog input
VREFI SADC2 AN — A/D Converter PGA voltage input
PA6/TCK2/SSEG9/
AN5/VREF
PA6 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TCK2 TM2C0 ST — TM2 input
SSEG9 SLCDC2 — SSEG Software controlled LCD segment output
AN5 ACERL AN — A/D Converter analog input
VREF SADC2 — AO A/D Converter reference voltage output
PA7/TP1/SSEG8/
AN6
PA7 PAWU
PAPU ST CMOS General purpose I/O. Register enabled pull-up and wake-up.
TP1 TMPC ST CMOS TM1 input/output
SSEG8 SLCDC2 — SSEG Software controlled LCD segment output
AN6 ACERL AN — A/D Converter analog input
PB0/INT0/SSEG18/
AN0/XT1
PB0 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
INT0 INTEG
IFS ST — External Interrupt 0
SSEG18 SLCDC3 — SSEG Software controlled LCD segment output
AN0 ACERL AN — A/D Converter analog input
XT1 CO LXT — LXT oscillator pin

Rev. 1.50 14 August 28, 2017 Rev. 1.50 15 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pad Name Function OPT I/T O/T Description
PB1/INT1/SSEG17/
AN1/XT2
PB1 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
INT1 INTEG
IFS ST — External Interrupt 1
SSEG17 SLCDC3 — SSEG Software controlled LCD segment output
AN1 ACERL AN — A/D Converter analog input
XT2 CO — LXT LXT oscillator pin
PB2/TCK0/
SSEG16/AN2
PB2 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
TCK0 TM0C0 ST — TM0 input
SSEG16 SLCDC3 — SSEG Software controlled LCD segment output
AN2 ACERL AN — A/D Converter analog input
PB3/[TX]/TP2/
SSEG7/AN7
PB3 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[TX] UCR1
UCR2 — CMOS UART TX serial data output
TP2 TMPC ST CMOS TM2 input/output
SSEG7 SLCDC2 — SSEG Software controlled LCD segment output
AN7 ACERL AN — A/D Converter analog input
PB4/[RX]/CLO/
SSEG6
PB4 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[RX] UCR1
UCR2 ST — UART RX serial data input
CLO TMPC — CMOS System clock output
SSEG6 SLCDC2 — SSEG Software controlled LCD segment output
PB5/[SCS]/C-/
SSEG5/SCOM5
PB5 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[SCS]
SLCDC0
SIMC0
IFS
ST CMOS SPI slave select
C- CPC AN — Comparator input
SSEG5 SLCDC1 — SSEG Software controlled LCD segment output
SCOM5 SLCDC1 — SCOM Software controlled LCD common output
PB6/[SCK/SCL]/C+/
SSEG4/SCOM4
PB6 PBPU ST CMOS General purpose I/O. Register enabled pull-up.
[SCK] SIMC0
IFS ST CMOS SPI serial clock
[SCL] SIMC0
IFS ST NMOS I2C clock line
C+ CPC AN — Comparator input
SSEG4 SLCDC1 — SSEG Software controlled LCD segment output
SCOM4 SLCDC1 — SCOM Software controlled LCD common output
PC0/SSEG19/
OSC1
PC0 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG19 SLCDC3 — SSEG Software controlled LCD segment output
OSC1 CO HXT — HXT oscillator pin
PC1/SSEG20/
OSC2
PC1 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG20 SLCDC3 — SSEG Software controlled LCD segment output
OSC2 CO — HXT HXT oscillator pin
PC2/[SDO]/SSEG0/
SCOM0
PC2 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
[SDO] SIMC0
IFS — CMOS SPI data output
SSEG0 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM0 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output

Rev. 1.50 16 August 28, 2017 Rev. 1.50 17 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Pad Name Function OPT I/T O/T Description
PC3/SDO/SSEG21
PC3 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SDO SIMC0
IFS — CMOS SPI data output
SSEG21 SLCDC3 — SSEG Software controlled LCD segment output
PC4/SDI/SDA//
SSEG22
PC4 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SDI SIMC0
IFS ST — SPI data input
SDA SIMC0
IFS ST NMOS I2C data line
SSEG22 SLCDC4 — SSEG Software controlled LCD segment output
PC5/SCK/SCL/
SSEG1/SCOM1
PC5 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SCK SIMC0
IFS ST CMOS SPI serial clock
SCL SIMC0
IFS ST NMOS I2C clock line
SSEG1 SLCDC0
SLCDC1 — SSEG Software controlled LCD segment output
SCOM1 SLCDC0
SLCDC1 — SCOM Software controlled LCD common output
PC6/SCS/SSEG23
PC6 PCPU ST CMOS General purpose I/O. Register enabled pull-up.
SCS SLCDC0
SIMC0 IFS ST CMOS SPI slave select
SSEG23 SLCDC4 — SSEG Software controlled LCD segment output
PD0/SSEG11 PD0 PDPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG11 SLCDC2 — SSEG Software controlled LCD segment output
PD1/RX/SSEG12
PD1 PDPU ST CMOS General purpose I/O. Register enabled pull-up.
RX UCR1
UCR2 ST — UART RX serial data input
SSEG12 SLCDC2 — SSEG Software controlled LCD segment output
PD2/TX/SSEG13
PD2 PDPU ST CMOS General purpose I/O. Register enabled pull-up.
TX UCR1
UCR2 — CMOS UART TX serial data output
SSEG13 SLCDC2 — SSEG Software controlled LCD segment output
PD3/SSEG14 PD3 PDPU ST CMOS General purpose I/O. Register enabled pull-up.
SSEG14 SLCDC3 — SSEG Software controlled LCD segment output
VDD&AVDD VDD — PWR — Positive power supply
AVDD — PWR — A/D converter positive power supply
VSS&AVSS VSS — PWR — Negative power supply, ground.
AVSS — PWR — A/D converter negative power supply, ground.
Note:I/T:Inputtype;  O/T:Outputtype;
OPT:Optionalbycongurationoption(CO)orregisteroption;
CO:Congurationoption; ST:SchmittTriggerinput; AN:Analoginput;
CMOS:CMOSoutput; NMOS:NMOSoutput; AO:Analogoutput;
SSEG:SoftwarecontrolledLCDSEG;   SCOM:SoftwarecontrolledLCDCOM;
HXT:Highfrequencycrystaloscillator;   LXT:Lowfrequencycrystaloscillator
PWR:Power
*TheAVDDpinisinternallybondedtogetherwiththeVDDpinwhiletheAVSSpinisinternallybonded
togetherwiththeVSSpin.
AsthePinDescriptionSummarytableappliestothepackagetypewiththemostpins,notalloftheabovelisted
pinsmaybepresentonpackagetypeswithsmallernumbersofpins.

Rev. 1.50 16 August 28, 2017 Rev. 1.50 17 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Absolute Maximum Ratings
SupplyVoltage.................................................................................................. VSS−0.3VtoVSS+6.0V
InputVoltage.....................................................................................................VSS−0.3VtoVDD+0.3V
StorageTemperature...................................................................................................... -50˚Cto125˚C
OperatingTemperature.....................................................................................................-40˚Cto85˚C
IOHTotal.......................................................................................................................................-80mA
IOLTotal........................................................................................................................................80mA
TotalPowerDissipation........................................................................................................... 500mW
Note:Thesearestressratingsonly.Stressesexceedingtherangespecifiedunder“Absolute
MaximumRatings”maycausesubstantialdamagetothesedevices.Functionaloperationof
thesedevicesatotherconditionsbeyondthoselistedinthespecicationisnotimpliedand
prolongedexposuretoextremeconditionsmayaffectdevicesreliability.
D.C. Characteristics
Ta=25°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD
Operating Voltage (HXT) —
fSYS= fHXT=8MHz 2.2 — 5.5 V
fSYS= fHXT=12MHz 2.7 — 5.5 V
fSYS= fHXT=16MHz 4.5 — 5.5 V
fSYS= fHXT=20MHz 4.5 — 5.5 V
Operating Voltage (HIRC) —
fSYS= fHIRC=8MHz 2.2 — 5.5 V
fSYS= fHIRC=12MHz 2.7 — 5.5 V
fSYS= fHIRC=16MHz 4.5 — 5.5 V
IDD
Operating Current (HXT)
3V fSYS=fH= fHXT=8MHz
No load, all peripherals off
— 1.0 1.5 mA
5V — 2.5 4.0 mA
3V fSYS=fH= fHXT=12MHz
No load, all peripherals off
— 1.5 2.5 mA
5V — 3.5 5.5 mA
5V fSYS=fH= fHXT=16MHz, no load,
all peripherals off — 4.5 7.0 mA
5V fSYS=fH= fHXT=20MHz, no load,
all peripherals off — 5.5 8.5 mA
Operating Current (HIRC)
3V fSYS=fH= fHIRC=8MHz
No load, all peripherals off
— 2.0 2.8 mA
5V — 3.0 4.5 mA
3V fSYS=fH= fHIRC=12MHz
No load, all peripherals off
— 3.0 4.2 mA
5V — 4.5 6.7 mA
5V fSYS=fH= fHIRC=16MHz
No load, all peripherals off — 6.0 9.0 mA
Operating Current (LXT) 3V fSYS=fSUB=fLXT=32.768kHz
No load, all peripherals off
— 10 20 μA
5V — 30 50 μA
Operating Current (LIRC) 3V fSYS=fSUB=fLIRC=32kHz
No load, all peripherals off
— 10 20 μA
5V — 30 50 μA

Rev. 1.50 18 August 28, 2017 Rev. 1.50 19 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
ISTB
Standby Current (IDLE0 Mode) 3V No load, all peripherals off,
fSUB on
— 3 5 μA
5V — 5 10 μA
Standby Current (IDLE1 Mode)
3V fSYS=fHXT=8MHz on, fSUB on
No load, all peripherals off
— 0.5 1.0 mA
5V — 1.0 2.0 mA
3V fSYS=fHXT=12MHz on, fSUB on
No load, all peripherals off
— 0.6 1.2 mA
5V — 1.2 2.4 mA
5V fSYS=fHXT=16MHz on, fSUB on
No load, all peripherals off — 2.0 4.0 mA
5V fSYS=fHXT=20MHz on, fSUB on
No load, all peripherals off — 2.5 5.0 mA
3V fSYS=fHIRC=8MHz on, fSUB on
No load, all peripherals off
— 0.8 1.6 mA
5V — 1.0 2.0 mA
3V fSYS=fHIRC=12MHz on, fSUB on
No load, all peripherals off
— 1.2 2.4 mA
5V — 1.5 3.0 mA
5V fSYS=fHIRC=16MHz on, fSUB on
No load, all peripherals off — 2.0 4.0 mA
Standby Current (SLEEP0 Mode) 3V fSUB off, WDT disable
No load, all peripherals off
— — 1.0 μA
5V — — 2.0 μA
Standby Current (SLEEP1 Mode) 3V fSUB on, WDT enable
No load, all peripherals off
— — 3.0 μA
5V — — 5.0 μA
VIL
Input Low Voltage for I/O Ports
or Input Pins
5V — 0 — 1.5 V
— — 0 — 0.2VDD V
VIH
Input High Voltage for I/O Ports
or Input Pins
5V — 3.5 — 5.0 V
— — 0.8VDD — VDD V
IOL Sink Current for I/O Port 3V VOL = 0.1VDD 16 32 — mA
5V VOL = 0.1VDD 32 64 — mA
IOH Source Current for I/O Port
3V VOH = 0.9VDD,
SLEDCn [m+1, m] = 00
n = 0 or 1; m = 0, 2, 4 or 6
-1.0 -2.0 — mA
5V -2.0 -4.0 — mA
3V VOH = 0.9VDD,
SLEDCn [m+1, m] = 01
n = 0 or 1; m = 0, 2, 4 or 6
-1.75 -3.5 — mA
5V -3.5 -7.0 — mA
3V VOH = 0.9VDD,
SLEDCn [m+1, m] = 10
n = 0 or 1; m = 0, 2, 4 or 6
-2.5 -5.0 — mA
5V -5.0 -10.0 — mA
3V VOH = 0.9VDD,
SLEDCn [m+1, m] = 11
n = 0 or 1; m = 0, 2, 4 or 6
-5.5 -11.0 — mA
5V -11.0 -22.0 — mA
RPH Pull-high Resistance for I/O Ports 3V — 20 60 100 kΩ
5V — 10 30 50 kΩ

Rev. 1.50 18 August 28, 2017 Rev. 1.50 19 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
A.C. Characteristics
Ta=25°C
Symbol Parameter Test Condition Min. Typ. Max. Unit
VDD Condition
fSYS
System Clock (HXT)
2.2V~5.5V fSYS=fHXT=8MHz — 8 — MHz
2.7V~5.5V fSYS=fHXT=12MHz — 12 — MHz
4.5V~5.5V fSYS=fHXT=16MHz — 16 — MHz
4.5V~5.5V fSYS=fHXT=20MHz — 20 — MHz
System Clock (HIRC)
2.4V~5.5V fSYS=fHIRC=8MHz — 8 — MHz
2.7V~5.5V fSYS=fHIRC=12MHz — 12 — MHz
4.5V~5.5V fSYS=fHIRC=16MHz — 16 — MHz
System Clock (LXT) 2.2V~5.5V fSYS=fLXT=32.768kHz — 32.768 — kHz
System Clock (LIRC) 2.2V~5.5V fSYS=fLIRC=32kHz — 32 — kHz
fLIRC Low Speed Internal RC oscillator (LIRC) 5V Ta=25°C -10% 32 +10% kHz
2.2V~5.5V Ta=-40°C to 85°C -50% 32 +60% kHz
tTCK TCKn pin Minimum Input Pulse Width — — 0.3 — — μs
tINT Interrupt Pin Minimum Input Pulse Width — — 10 — — μs
tSST
System Start-up Timer Period
(Wake-up from power down mode and
fSYS off)
— fSYS=fHXT off 128 — — tHXT
— fSYS=fHIRC off 16 — — tHIRC
— fSYS=fLXT off 128 — — tLXT
— fSYS=fLIRC off 2 — — tLIRC
System Start-up Timer Period
(Wake-up from power down mode) — fSYS on 2 — — tSYS
tRSTD
System reset delay time
(Power-on reset, LVR hardware reset,
LVRC/WDTC software reset)
— — 25 50 100 ms
System reset delay time
(WDT hardware reset) — — 8.3 16.7 33.3 ms
tEERD EEPROM Read Time — — — — 4 tSYS
tEEWR EEPROM Write Time — — — 2 4 ms
Note:tSYS=1/fSYS

Rev. 1.50 20 August 28, 2017 Rev. 1.50 21 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HIRC Electrical Characteristics
Ta=25°C
Frequency Accuracy trimmed 8MHz at VDD=3V
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
fHIRC
High Speed Internal RC oscillator
(HIRC)
3V Ta = 25°C -2% 8 +2% MHz
3V ± 0.3V Ta = 0°C ~ 70°C -5% 8 +5% MHz
3V ± 0.3V Ta = -40°C ~ 85°C -7% 8 +7% MHz
2.2V ~ 5.5V Ta = 0°C ~ 70°C -7% 8 +7% MHz
2.2V ~ 5.5V Ta = -40°C ~ 85°C -10% 8 +10% MHz
3V Ta = 25°C -20% 12 +20% MHz
3V Ta = 25°C -20% 16 +20% MHz
Frequency Accuracy trimmed 8MHz at VDD=5V
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
fHIRC
High Speed Internal RC oscillator
(HIRC)
5V Ta = 25°C -2% 8 +2% MHz
5V ± 0.5V Ta = 0°C ~ 70°C -5% 8 +5% MHz
5V ± 0.5V Ta = -40°C ~ 85°C -7% 8 +7% MHz
2.2V ~ 5.5V Ta = 0°C ~ 70°C -7% 8 +7% MHz
2.2V ~ 5.5V Ta = -40°C ~ 85°C -10% 8 +10% MHz
5V Ta = 25°C -20% 12 +20% MHz
5V Ta = 25°C -20% 16 +20% MHz
Frequency Accuracy trimmed 12MHz at VDD=3V
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
fHIRC
High Speed Internal RC oscillator
(HIRC)
3V Ta = 25°C -2% 12 +2% MHz
3V ± 0.3V Ta = 0°C ~ 70°C -5% 12 +5% MHz
3V ± 0.3V Ta = -40°C ~ 85°C -7% 12 +7% MHz
2.2V ~ 5.5V Ta = 0°C ~ 70°C -7% 12 +7% MHz
2.2V ~ 5.5V Ta = -40°C ~ 85°C -10% 12 +10% MHz
3V Ta = 25°C -20% 8 +20% MHz
3V Ta = 25°C -20% 16 +20% MHz