Holtek HT66F20-1 User manual

Flash MCU with EEPROM
HT66F20-1/HT66F30-1
HT68F20-1/HT68F30-1
Revision: V1.40 Date: November 23, 2016November 23, 2016

Rev. 1.40 2 November 23, 2016 Rev. 1.40 3 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
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.............................................................................................. 10
Pin Description .............................................................................................. 12
Absolute Maximum Ratings.......................................................................... 16
D.C. Characteristics....................................................................................... 16
HT66F20-1/HT66F30-1......................................................................................................... 16
HT68F20-1/HT68F30-1......................................................................................................... 18
A.C. Characteristics....................................................................................... 19
HT66F20-1/HT66F30-1......................................................................................................... 19
HT68F20-1/HT68F30-1......................................................................................................... 21
A/D Converter Characteristics...................................................................... 22
HT66F20-1/HT66F30-1......................................................................................................... 22
Comparator Electrical Characteristics ........................................................ 22
Power on Reset Electrical Characteristics.................................................. 23
System Architecture...................................................................................... 23
Clocking and Pipelining......................................................................................................... 23
Program Counter................................................................................................................... 24
Stack ..................................................................................................................................... 25
Arithmetic and Logic Unit – ALU ........................................................................................... 25
Flash Program Memory................................................................................. 26
Structure................................................................................................................................ 26
Special Vectors ..................................................................................................................... 26
Look-up Table........................................................................................................................ 27
Table Program Example........................................................................................................ 27
In Circuit Programming ......................................................................................................... 28
Data Memory .................................................................................................. 29
Structure................................................................................................................................ 29

Rev. 1.40 2 November 23, 2016 Rev. 1.40 3 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Special Function Register Description........................................................ 35
Indirect Addressing Registers – IAR0, IAR1 ......................................................................... 35
Memory Pointers – MP0, MP1 .............................................................................................. 35
Bank Pointer – BP................................................................................................................. 36
Accumulator – ACC............................................................................................................... 36
Program Counter Low Register – PCL.................................................................................. 36
Look-up Table Registers – TBLP, TBHP, TBLH..................................................................... 37
Status Register – STATUS.................................................................................................... 37
EEPROM Data Memory.................................................................................. 38
EEPROM Data Memory Structure ........................................................................................ 38
EEPROM Registers .............................................................................................................. 39
Reading Data from the EEPROM ......................................................................................... 41
Writing Data to the EEPROM................................................................................................ 41
Write Protection..................................................................................................................... 41
EEPROM Interrupt ................................................................................................................ 41
Programming Consideration ................................................................................................. 42
Programming Examples........................................................................................................ 42
Oscillator ........................................................................................................ 43
Oscillator Overview ............................................................................................................... 43
System Clock Congurations................................................................................................ 43
External Crystal/Ceramic Oscillator – HXT ........................................................................... 44
External RC Oscillator – ERC ............................................................................................... 45
Internal RC Oscillator – HIRC ............................................................................................... 45
External 32.768kHz Crystal Oscillator – LXT ........................................................................ 46
LXT Oscillator Low Power Function ...................................................................................... 47
Internal 32kHz Oscillator – LIRC........................................................................................... 47
Supplementary Clocks .......................................................................................................... 47
Operating Modes and System Clocks ......................................................... 48
System Clocks ...................................................................................................................... 48
System Operation Modes...................................................................................................... 50
Control Register .................................................................................................................... 51
Fast Wake-up........................................................................................................................ 52
Operating Mode Switching .................................................................................................... 54
Standby Current Considerations ........................................................................................... 57
Wake-up................................................................................................................................ 57
Programming Considerations................................................................................................ 58
Watchdog Timer............................................................................................. 58
Watchdog Timer Clock Source.............................................................................................. 58
Watchdog Timer Control Register ......................................................................................... 59
Watchdog Timer Operation ................................................................................................... 60
Reset and Initialisation.................................................................................. 61
Reset Functions .................................................................................................................... 61
Reset Initial Conditions ......................................................................................................... 64

Rev. 1.40 4 November 23, 2016 Rev. 1.40 5 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Input/Output Ports ......................................................................................... 71
I/O Port Register List............................................................................................................. 71
Pull-high Resistors ................................................................................................................ 72
Port A Wake-up ..................................................................................................................... 73
I/O Port Control Registers ..................................................................................................... 73
Pin-remapping Functions ...................................................................................................... 74
Pin-remapping Registers....................................................................................................... 74
I/O Pin Structures.................................................................................................................. 75
Programming Considerations................................................................................................ 76
Timer Modules – TM ...................................................................................... 76
Introduction ........................................................................................................................... 76
TM Operation ........................................................................................................................ 77
TM Clock Source................................................................................................................... 77
TM Interrupts......................................................................................................................... 77
TM External Pins................................................................................................................... 78
TM Input/Output Pin Control ................................................................................................. 78
Programming Considerations................................................................................................ 82
Compact Type TM – CTM .............................................................................. 83
Compact TM Operation......................................................................................................... 83
Compact Type TM Register Description................................................................................ 84
Compact Type TM Operating Modes .................................................................................... 87
Compare Match Output Mode............................................................................................... 87
Timer/Counter Mode ............................................................................................................. 90
PWM Output Mode................................................................................................................ 90
Standard Type TM – STM .............................................................................. 93
Standard TM Operation......................................................................................................... 93
Standard Type TM Register Description ............................................................................... 94
Standard Type TM Operating Modes .................................................................................... 98
Compare Match Output Mode............................................................................................... 98
Timer/Counter Mode ........................................................................................................... 101
PWM Output Mode.............................................................................................................. 101
Single Pulse Mode .............................................................................................................. 104
Capture Input Mode ............................................................................................................ 106
Enhanced Type TM – ETM........................................................................... 107
Enhanced TM Operation ..................................................................................................... 107
Enhanced Type TM Register Description............................................................................ 108
Enhanced Type TM Operating Modes..................................................................................114
Compare Match Output Mode..............................................................................................115
Timer/Counter Mode ........................................................................................................... 120
PWM Output Mode.............................................................................................................. 120
Single Pulse Output Mode .................................................................................................. 126
Capture Input Mode ............................................................................................................ 128

Rev. 1.40 4 November 23, 2016 Rev. 1.40 5 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Analog to Digital Converter ........................................................................ 131
A/D Overview ...................................................................................................................... 131
A/D Converter Register Description .................................................................................... 131
A/D Converter Data Registers – ADRL, ADRH ................................................................... 132
A/D Converter Control Registers – ADCR0, ADCR1, ACERL............................................. 132
A/D Operation ..................................................................................................................... 135
A/D Input Pins ..................................................................................................................... 136
Summary of A/D Conversion Steps..................................................................................... 137
Programming Considerations.............................................................................................. 138
A/D Transfer Function ......................................................................................................... 138
A/D Programming Example................................................................................................. 139
Comparators ................................................................................................ 141
Comparator Operation ........................................................................................................ 141
Comparator Registers ......................................................................................................... 141
Comparator Interrupt........................................................................................................... 144
Programming Considerations.............................................................................................. 144
Serial Interface Module – SIM ..................................................................... 144
SPI Interface ....................................................................................................................... 144
I2C Interface ........................................................................................................................ 151
I2C Bus Start Signal............................................................................................................. 157
Slave Address ..................................................................................................................... 157
I2C Bus Read/Write Signal .................................................................................................. 157
I2C Bus Slave Address Acknowledge Signal ....................................................................... 157
I2C Bus Data and Acknowledge Signal ............................................................................... 158
Peripheral Clock Output.............................................................................. 160
Peripheral Clock Operation ................................................................................................. 160
Interrupts ...................................................................................................... 161
Interrupt Registers............................................................................................................... 161
Interrupt Operation .............................................................................................................. 169
External Interrupt................................................................................................................. 172
Comparator Interrupt........................................................................................................... 172
Multi-function Interrupt ........................................................................................................ 172
A/D Converter Interrupt ....................................................................................................... 173
Time Base Interrupts........................................................................................................... 173
Serial Interface Module Interrupts ....................................................................................... 175
External Peripheral Interrupt ............................................................................................... 175
EEPROM Interrupt .............................................................................................................. 175
LVD Interrupt ....................................................................................................................... 176
TM Interrupts....................................................................................................................... 176
Interrupt Wake-up Function................................................................................................. 176
Programming Considerations.............................................................................................. 177

Rev. 1.40 6 November 23, 2016 Rev. 1.40 7 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Low Voltage Detector – LVD ....................................................................... 178
LVD Register ....................................................................................................................... 178
LVD Operation..................................................................................................................... 179
SCOM Function for LCD.............................................................................. 180
LCD Operation .................................................................................................................... 180
LCD Bias Control ................................................................................................................ 181
Conguration Options................................................................................. 182
Application Circuits..................................................................................... 183
HT66F20-1/HT66F30-1....................................................................................................... 183
HT68F20-1/HT68F30-1....................................................................................................... 184
Instruction Set.............................................................................................. 185
Introduction ......................................................................................................................... 185
Instruction Timing ................................................................................................................ 185
Moving and Transferring Data............................................................................................. 185
Arithmetic Operations.......................................................................................................... 185
Logical and Rotate Operation ............................................................................................. 186
Branches and Control Transfer ........................................................................................... 186
Bit Operations ..................................................................................................................... 186
Table Read Operations ....................................................................................................... 186
Other Operations................................................................................................................. 186
Instruction Set Summary ............................................................................ 187
Table Conventions............................................................................................................... 187
Instruction Denition................................................................................... 189
Package Information ................................................................................... 198
16-pin DIP (300mil) Outline Dimensions ............................................................................. 199
16-pin NSOP (150mil) Outline Dimensions......................................................................... 201
16-pin SSOP (150mil) Outline Dimensions ......................................................................... 202
20-pin DIP (300mil) Outline Dimensions ............................................................................. 203
20-pin SOP (300mil) Outline Dimensions ........................................................................... 205
20-pin SSOP (150mil) Outline Dimensions ......................................................................... 206
24-pin SKDIP (300mil) Outline Dimensions ........................................................................ 207
24-pin SOP (300mil) Outline Dimensions ........................................................................... 209
24-pin SSOP(150mil) Outline Dimensions .......................................................................... 210

Rev. 1.40 6 November 23, 2016 Rev. 1.40 7 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
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
• Fiveoscillators:

♦ExternalCrystal-HXT

♦External32.768kHzCrystal-LXT

♦ExternalRC-ERC

♦InternalRC-HIRC

♦Internal32kHzRC-LIRC
• Multi-modeoperation:NORMAL,SLOW,IDLEandSLEEP
• Fullyintegratedinternal4MHz,8MHzand12MHzoscillatorrequiresnoexternalcomponents
• Allinstructionsexecutedinoneortwoinstructioncycles
• Tablereadinstructions
• 63powerfulinstructions
• 4-levelsubroutinenesting
• Bitmanipulationinstruction
Peripheral Features
• FlashProgramMemory:1K×16~2K×16
• DataMemory:64×8~96×8
• TrueEEPROMMemory:32×8~64×8
• WatchdogTimerfunction
• Upto22bidirectionalI/Olines
• Softwarecontrolled4-SCOMlinesLCDdriverwith1/2bias
• Dualpin-sharedexternalinterrupts
• MultipleTimerModulefortimemeasure,inputcapture,comparematchoutput,PWMoutputor
singlepulseoutputfunction
• SerialInterfacesModulewithDualSPIandI2Cinterfaces
• DualComparatorfunctions
• DualTime-Basefunctionsforgenerationofxedtimeinterruptsignals
• 8-channel12-bitresolutionA/Dconverter–HT66F30-1/HT66F20-1
• Lowvoltageresetfunction
• Lowvoltagedetectfunction
• Widerangeofavailablepackagetypes
• 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

Rev. 1.40 8 November 23, 2016 Rev. 1.40 9 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
General Description
TheHT66Fx0-1andHT68Fx0-1seriesareFlashMemorytypewith8-bithighperformance
RISCarchitecturemicrocontrollers,designedforawiderangeofapplications.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,calibrationdata
etc.
Analogfeaturesincludeamulti-channel12-bitA/Dconverteranddualcomparatorfunctions.
MultipleandextremelyflexibleTimerModulesprovidetiming,pulsegenerationandPWM
generationfunctions.Communicationwiththeoutsideworldiscateredforbyincludingfully
integratedSPIorI2Cinterfacefunctions,twopopularinterfaceswhichprovidedesignerswitha
meansofeasycommunicationwithexternalperipheralhardware.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,ERC,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minimise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Program
Memory,DataMemorycapacity,TMfeature,A/Dfunction,I/Ocountandpackagetyhpes.The
followingtablesummarisesthemainfeaturesofeachdevice.
Part No. Program
Memory
Data
Memory
Data
EEPROM I/O Ext. Interrupt A/D Timer Module
SPI/
I2C
Time
Base Comp. Stack Package
HT68F20-1 1K×16 64×8 32×8 18 2 --- 10-bit CTM×1
10-bit STM×1 √2 2 4 16DIP/NSOP/SSOP 20DIP/SOP/SSOP
HT68F30-1 2K×16 96×8 64×8 22 2 --- 10-bit CTM×1
10-bit ETM×1 √2 2 4
16DIP/NSOP/SSOP
20DIP/SOP/SSOP
24SKDIP/SOP/
SSOP
HT66F20-1 1K×16 64×8 32×8 18 2 12-bitx8 10-bit CTM×1
10-bit STM×1 √2 2 4 16DIP/NSOP/SSOP 20DIP/SOP/SSOP
HT66F30-1 2K×16 96×8 64×8 22 2 12-bitx8 10-bit CTM×1
10-bit ETM×1 √2 2 4
16DIP/NSOP/SSOP
20DIP/SOP/SSOP
24SKDIP/SOP/
SSOP

Rev. 1.40 8 November 23, 2016 Rev. 1.40 9 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Block Diagram


 
 

 




 
  
  

  
  
 
 
  






 










 
 




Note:OnlytheHT66F30-1andHT66F20-1deviceshaveA/Dfunction.

Rev. 1.40 10 November 23, 2016 Rev. 1.40 11 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Pin Assignment
HT66F20-1 & HT66F30-1

    
















  
  
   
  




 



























  
  
   
  

  



 
 







   
    

      

























     
 







  
  
  
 
  
  
   
  





 
  
 

    

















  
   
  

  


 




























  
   
  





  

 










      
Note:1.Bracketedpinnamesindicatenon-defaultpinoutremappinglocations.
2.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.

Rev. 1.40 10 November 23, 2016 Rev. 1.40 11 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT68F20-1 & HT68F30-1

     

















  
  
  

 































  
  
  





 








  
    

      

























       








   
  
   
  

  
  
  





 
  
 

     

















  
  
  

 































  
  
  

 



  











     
Note:1.Bracketedpinnamesindicatenon-defaultpinoutremappinglocations.
2.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.

Rev. 1.40 12 November 23, 2016 Rev. 1.40 13 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Pin Description
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.
HT66F20-1
Pin Name Function OP I/T O/T Pin-Shared Mapping
PA0~PA7 Port A PAWU
PAPU ST CMOS —
PB0~PB5 Port B PBPU ST CMOS —
PC0~PC3 Port C PCPU ST CMOS —
AN0~AN7 ADC input ACERL AN — PA0~PA7
VREF ADC reference input ADCR1 AN — PB5
C0-, C1- Comparator 0, 1 input
CP0C
CP1C
AN — PA3, PC3
C0+, C1+ Comparator 0, 1 input AN — PA2, PC2
C0X, C1X Comparator 0, 1 output — CMOS PA0, PA5
TCK0, TCK1 TM0, TM1 input — ST — PA2, PA4
TP0_0 TM0 I/O TMPC0 ST CMOS PA0
TP1_0, TP1_1 TM1 I/O TMPC0 ST CMOS PA1, PC0
INT0, INT1 Ext. Interrupt 0, 1 — ST — PA3, PA4
PINT Peripheral Interrupt — ST — PC3
PCK Peripheral Clock output — — CMOS PC2
SDI SPI Data input — ST — PA6
SDO SPI Data output — — CMOS PA5
SCS SPI Slave Select — ST CMOS PB5
SCK SPI Serial Clock — ST CMOS PA7
SCL I2C Clock — ST NMOS PA7
SDA I2C Data — ST NMOS PA6
SCOM0~SCOM3 SCOM0~SCOM3 SCOMC — SCOM PC0, PC1, PC2, PC3
OSC1 HXT/ERC pin CO HXT — PB1
OSC2 HXT pin CO — HXT PB2
XT1 LXT pin CO LXT — PB3
XT2 LXT pin CO — LXT PB4
RES Reset input CO ST — PB0
VDD Power supply* — PWR — —
AVDD ADC power supply* — PWR — —
VSS Ground** — PWR — —
AVSS ADC ground** — PWR — —
Note:I/T:Inputtype;  O/T:Outputtype
OP:Optionalbycongurationoption(CO)orregisteroption
PWR:Power;  CO:Congurationoption; ST:SchmittTriggerinput
CMOS:CMOSoutput; NMOS:NMOSoutput
SCOM:SoftwarecontrolledLCDCOM;   AN:Analoginputpin
HXT:Highfrequencycrystaloscillator   LXT:Lowfrequencycrystaloscillator
*:VDDisthedevicepowersupplywhileAVDDistheADCpowersupply.TheAVDDpinisbonded
togetherinternallywithVDD.
**:VSSisthedevicegroundpinwhileAVSSistheADCgroundpin.TheAVSSpinisbondedtogether
internallywithVSS.
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. 1.40 12 November 23, 2016 Rev. 1.40 13 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F30-1
Pin Name Function OP I/T O/T Pin-Shared Mapping
PA0~PA7 Port A PAWU
PAPU ST CMOS —
PB0~PB5 Port B PBPU ST CMOS —
PC0~PC7 Port C PCPU ST CMOS —
AN0~AN7 ADC input ACERL AN — PA0~PA7
VREF ADC reference input ADCR1 AN — PB5
C0-, C1- Comparator 0, 1 input
CP0C
CP1C
AN — PA3, PC3
C0+, C1+ Comparator 0, 1 input AN — PA2, PC2
C0X, C1X Comparator 0, 1 output — CMOS PA0, PA5
TCK0, TCK1 TM0, TM1 input — ST — PA2, PA4
TP0_0, TP0_1 TM0 I/O TMPC0 ST CMOS PA0, PC5
TP1A TM1 I/O TMPC0 ST CMOS PA1
TP1B_0, TP1B_1 TM1 I/O TMPC0 ST CMOS PC0, PC1
INT0, INT1 Ext. interrupt 0, 1 — ST — PA3, PA4
PINT Peripheral interrupt PRM0 ST — PC3 or PC4
PCK Peripheral clock output PRM0 — CMOS PC2 or PC5
SDI SPI data input PRM0 ST — PA6 or PC0
SDO SPI data output PRM0 — CMOS PA5 or PC1
SCS SPI slave select PRM0 ST CMOS PB5 or PC6
SCK SPI serial clock PRM0 ST CMOS PA7 or PC7
SCL I2C clock PRM0 ST NMOS PA7 or PC7
SDA I2C data PRM0 ST NMOS PA6 or PC0
SCOM0~SCOM3 SCOM0~SCOM3 SCOMC — SCOM PC0, PC1, PC6, PC7
OSC1 HXT/ERC pin CO HXT — PB1
OSC2 HXT pin CO — HXT PB2
XT1 LXT pin CO LXT — PB3
XT2 LXT pin CO — LXT PB4
RES Reset input CO ST — PB0
VDD Power supply * — PWR — —
AVDD ADC power supply * — PWR — —
VSS Ground ** — PWR — —
AVSS ADC ground ** — PWR — —
Note:I/T:Inputtype;  O/T:Outputtype
OP:Optionalbycongurationoption(CO)orregisteroption
PWR:Power;  CO:Congurationoption; ST:SchmittTriggerinput
CMOS:CMOSoutput; NMOS:NMOSoutput
SCOM:SoftwarecontrolledLCDCOM;   AN:Analoginputpin
HXT:Highfrequencycrystaloscillator;   LXT:Lowfrequencycrystaloscillator
*:VDDisthedevicepowersupplywhileAVDDistheADCpowersupply.TheAVDDpinisbonded
togetherinternallywithVDD.
**:VSSisthedevicegroundpinwhileAVSSistheADCgroundpin.TheAVSSpinisbondedtogether
internallywithVSS.
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. 1.40 14 November 23, 2016 Rev. 1.40 15 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT68F20-1
Pin Name Function OP I/T O/T Pin-Shared Mapping
PA0~PA7 Port A PAWU
PAPU ST CMOS —
PB0~PB5 Port B PBPU ST CMOS —
PC0~PC3 Port C PCPU ST CMOS —
C0-, C1- Comparator 0, 1 input
CP0C
CP1C
AN — PA3, PC3
C0+, C1+ Comparator 0, 1 input AN — PA2, PC2
C0X, C1X Comparator 0, 1 output — CMOS PA0, PA5
TCK0, TCK1 TM0, TM1 input — ST — PA2, PA4
TP0_0 TM0 I/O TMPC0 ST CMOS PA0
TP1_0, TP1_1 TM1 I/O TMPC0 ST CMOS PA1, PC0
INT0, INT1 Ext. Interrupt 0, 1 — ST — PA3, PA4
PINT Peripheral Interrupt — ST — PC3
PCK Peripheral Clock output — — CMOS PC2
SDI SPI Data input — ST — PA6
SDO SPI Data output — — CMOS PA5
SCS SPI Slave Select — ST CMOS PB5
SCK SPI Serial Clock — ST CMOS PA7
SCL I2C Clock — ST NMOS PA7
SDA I2C Data — ST NMOS PA6
SCOM0~SCOM3 SCOM0~SCOM3 SCOMC — SCOM PC0, PC1, PC2, PC3
OSC1 HXT/ERC pin CO HXT — PB1
OSC2 HXT pin CO — HXT PB2
XT1 LXT pin CO LXT — PB3
XT2 LXT pin CO — LXT PB4
RES Reset input CO ST — PB0
VDD Power supply — PWR — —
VSS Ground — PWR — —
Note:I/T:Inputtype
O/T:Outputtype
OP:Optionalbycongurationoption(CO)orregisteroption
PWR:Power
CO:Congurationoption
ST:SchmittTriggerinput
CMOS:CMOSoutput
NMOS:NMOSoutput
SCOM:SoftwarecontrolledLCDCOM
AN:Analoginputpin
HXT:Highfrequencycrystaloscillator
LXT:Lowfrequencycrystaloscillator
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. 1.40 14 November 23, 2016 Rev. 1.40 15 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT68F30-1
Pin Name Function OP I/T O/T Pin-Shared Mapping
PA0~PA7 Port A PAWU
PAPU ST CMOS —
PB0~PB5 Port B PBPU ST CMOS —
PC0~PC7 Port C PCPU ST CMOS —
C0-, C1- Comparator 0, 1 input
CP0C
CP1C
AN — PA3, PC3
C0+, C1+ Comparator 0, 1 input AN — PA2, PC2
C0X, C1X Comparator 0, 1 output — CMOS PA0, PA5
TCK0, TCK1 TM0, TM1 input — ST — PA2, PA4
TP0_0, TP0_1 TM0 I/O TMPC0 ST CMOS PA0, PC5
TP1A TM1 I/O TMPC0 ST CMOS PA1
TP1B_0, TP1B_1 TM1 I/O TMPC0 ST CMOS PC0, PC1
INT0, INT1 Ext. interrupt 0, 1 — ST — PA3, PA4
PINT Peripheral interrupt PRM0 ST — PC3 or PC4
PCK Peripheral clock output PRM0 — CMOS PC2 or PC5
SDI SPI data input PRM0 ST — PA6 or PC0
SDO SPI data output PRM0 — CMOS PA5 or PC1
SCS SPI slave select PRM0 ST CMOS PB5 or PC6
SCK SPI serial clock PRM0 ST CMOS PA7 or PC7
SCL I2C clock PRM0 ST NMOS PA7 or PC7
SDA I2C data PRM0 ST NMOS PA6 or PC0
SCOM0~SCOM3 SCOM0~SCOM3 SCOMC — SCOM PC0, PC1, PC6, PC7
OSC1 HXT/ERC pin CO HXT — PB1
OSC2 HXT pin CO — HXT PB2
XT1 LXT pin CO LXT — PB3
XT2 LXT pin CO — LXT PB4
RES Reset input CO ST — PB0
VDD Power supply — PWR — —
VSS Ground — PWR — —
Note:I/T:Inputtype
O/T:Outputtype
OP:Optionalbycongurationoption(CO)orregisteroption
PWR:Power
CO:Congurationoption
ST:SchmittTriggerinput
CMOS:CMOSoutput
NMOS:NMOSoutput
SCOM:SoftwarecontrolledLCDCOM
AN:Analoginputpin
HXT:Highfrequencycrystaloscillator
LXT:Lowfrequencycrystaloscillator
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. 1.40 16 November 23, 2016 Rev. 1.40 17 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
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
HT66F20-1/HT66F30-1
Ta=25˚C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD
Operating Voltage
(HXT, ERC, HIRC) —
fSYS=8MHz 2.2 — 5.5 V
fSYS=12MHz 2.7 — 5.5 V
fSYS=20MHz 4.5 — 5.5 V
IDD1
Operating Current, Normal Mode,
fSYS=fH(HXT, ERC, HIRC)
3V No load, fSYS=fH=4MHz,
ADC off, WDT enable
— 0.7 1.1 mA
5V — 1.8 2.7 mA
3V No load, fSYS=fH=8MHz,
ADC off, WDT enable
— 1.6 2.4 mA
5V — 3.3 5.0 mA
3V No load, fSYS=fH=12MHz,
ADC off, WDT enable
— 2.2 3.3 mA
5V — 5.0 7.5 mA
IDD2
Operating Current, Normal Mode,
fSYS=fH(HXT) 5V No load, fSYS=fH=20MHz, ADC off, WDT enable — 6.0 9.0 mA
IDD3
Operating Current, Slow Mode,
fSYS=fL(LXT, LIRC)
3V No load, fSYS=fL, ADC off,
WDT enable
— 10 20 μA
5V — 30 50 μA
IIDLE0
IDLE0 Mode Standby Current
(LXT or LIRC on)
3V No load, ADC off,
WDT enable
— 1.5 3.0 μA
5V — 3.0 6.0 μA
IIDLE1
IDLE1 Mode Standby Current
(HXT, ERC, HIRC)
3V No load, ADC off,
WDT enable, fSYS=12MHz on
— 0.55 0.83 mA
5V — 1.30 2.00 mA
ISLEEP0
SLEEP0 Mode Standby Current
(LXT and LIRC off)
3V No load, ADC off,
WDT disable
— — 1 μA
5V — — 2μA
ISLEEP1
SLEEP1 Mode Standby Current
(LXT or LIRC on)
3V No load, ADC off,
WDT enable
— 1.5 3.0 μA
5V — 2.5 5.0 μA

Rev. 1.40 16 November 23, 2016 Rev. 1.40 17 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VIL1
Input Low Voltage for I/O Ports or
Input Pins except RES pin — — 0 — 0.3VDD V
VIH1
Input High Voltage for I/O Ports or
Input Pins except RES pin — — 0.7VDD — VDD V
VIL2 Input Low Voltage (RES) — — 0 — 0.4VDD V
VIH2 Input High Voltage (RES) — — 0.9VDD — VDD V
VLVR LVR Voltage Level —
LVR Enable, 2.10V option -5% 2.10 +5% V
LVR Enable, 2.55V option -5% 2.55 +5% V
LVR Enable, 3.15V option -5% 3.15 +5% V
LVR Enable, 4.20V option -5% 4.20 +5% V
VLVD LVD Voltage Level —
LVDEN=1, VLVD=2.0V -5% 2.00 +5% V
LVDEN=1, VLVD=2.2V -5% 2.20 +5% V
LVDEN=1, VLVD=2.4V -5% 2.40 +5% V
LVDEN=1, VLVD=2.7V -5% 2.70 +5% V
LVDEN=1, VLVD=3.0V -5% 3.00 +5% V
LVDEN=1, VLVD=3.3V -5% 3.30 +5% V
LVDEN=1, VLVD=3.6V -5% 3.60 +5% V
LVDEN=1, VLVD=4.4V -5% 4.40 +5% V
ILV
Additional Power Consumption if
LVR and LVD is Used —
LVR enable, LVDEN=0 — 60 90 μA
LVR disable, LVDEN=1 — 75 115 μA
LVR enable, LVDEN=1 — 90 135 μA
VOL Output Low Voltage I/O Port 3V IOL=9mA — — 0.3 V
5V IOL=20mA — — 0.5 V
VOH Output High Voltage I/O Port 3V IOH=-3.2mA 2.7 — — V
5V IOH=-7.4mA 4.5 — — V
RPH Pull-high Resistance for I/O Ports 3V —20 60 100 kΩ
5V 10 30 50 kΩ
ISCOM SCOM Operating Current 5V
SCOMC, ISEL[1:0]=00 17.5 25.0 32.5 μA
SCOMC, ISEL[1:0]=01 35 50 65 μA
SCOMC, ISEL[1:0]=10 70 100 130 μA
SCOMC, ISEL[1:0]=11 140 200 260 μA
VSCOM VDD/2 Voltage for LCD COM 5V No load 0.475 0.500 0.525 VDD
V125 1.25V Reference with Buffer Voltage — — -3% 1.25 +3% V
I125
Additional Power Consumption if
1.25V Reference with Buffer is used — — — 200 300 μA

Rev. 1.40 18 November 23, 2016 Rev. 1.40 19 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT68F20-1/HT68F30-1
Ta=25˚C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD
Operating Voltage
(HXT, ERC, HIRC) —
fSYS=8MHz 2.2 — 5.5 V
fSYS=12MHz 2.7 — 5.5 V
fSYS=20MHz 4.5 — 5.5 V
IDD1
Operating Current,
Normal Mode, fSYS=fH
(HXT, ERC, HIRC)
3V No load, fSYS=fH=4MHz,
WDT enable
— 0.7 1.1 mA
5V — 1.8 2.7 mA
3V No load, fSYS=fH=8MHz,
WDT enable
— 1.6 2.4 mA
5V — 3.3 5.0 mA
3V No load, fSYS=fH=12MHz,
WDT enable
— 2.2 3.3 mA
5V — 5.0 7.5 mA
IDD2
Operating Current,
Normal Mode, fSYS=fH(HXT) 5V No load, fSYS=fH=20MHz, WDT enable — 6.0 9.0 mA
IDD3
Operating Current, Slow Mode,
fSYS=fL(LXT, LIRC)
3V No load, fSYS=fL,
WDT enable
— 10 20 μA
5V — 30 50 μA
IIDLE0
IDLE0 Mode Standby Current
(LXT or LIRC on)
3V No load, WDT enable — 1.5 3.0 mA
5V — 3.0 6.0 mA
IIDLE1
IDLE1 Mode Standby Current
(HXT, ERC, HIRC)
3V No load, WDT enable,
fSYS=12MHz on
— 0.55 0.83 mA
5V — 1.30 2.00 mA
ISLEEP0
SLEEP0 Mode Standby Current
(LXT and LIRC off)
3V No load, WDT disable — — 1 μA
5V — — 2μA
ISLEEP1
SLEEP1 Mode Standby Current
(LXT or LIRC on)
3V No load, WDT enable — 1.5 3.0 μA
5V — 2.5 5.0 μA
VIL1
Input Low Voltage for I/O Ports or
Input Pins except RES pin — — 0 — 0.3VDD V
VIH1
Input High Voltage for I/O Ports
or Input Pins except RES pin — — 0.7VDD — VDD V
VIL2 Input Low Voltage (RES) — — 0 — 0.4VDD V
VIH2 Input High Voltage (RES) — — 0.9VDD — VDD V
VLVR LVR Voltage Level —
LVR Enable, 2.10V option -5% 2.10 +5% V
LVR Enable, 2.55V option -5% 2.55 +5% V
LVR Enable, 3.15V option -5% 3.15 +5% V
LVR Enable, 4.20V option -5% 4.20 +5% V
VLVD LVD Voltage Level —
LVDEN=1, VLVD=2.0V -5% 2.00 +5% V
LVDEN=1, VLVD=2.2V -5% 2.20 +5% V
LVDEN=1, VLVD=2.4V -5% 2.40 +5% V
LVDEN=1, VLVD=2.7V -5% 2.70 +5% V
LVDEN=1, VLVD=3.0V -5% 3.00 +5% V
LVDEN=1, VLVD=3.3V -5% 3.30 +5% V
LVDEN=1, VLVD=3.6V -5% 3.60 +5% V
LVDEN=1, VLVD=4.4V -5% 4.40 +5% V

Rev. 1.40 18 November 23, 2016 Rev. 1.40 19 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
ILV
Additional Power Consumption if
LVR and LVD is used —
LVR enable, LVDEN=0 — 60 90 μA
LVR disable, LVDEN=1 — 75 115 μA
LVR enable, LVDEN=1 — 90 135 μA
VOL Output Low Voltage I/O Port 3V IOL=9mA — — 0.3 V
5V IOL=20mA — — 0.5 V
VOH Output High Voltage I/O Port 3V IOH=-3.2mA 2.7 — — V
5V IOH=-7.4mA 4.5 — — V
RPH Pull-high Resistance for I/O Ports 3V —20 60 100 kΩ
5V 10 30 50 kΩ
ISCOM SCOM Operating Current 5V
SCOMC, ISEL[1:0]=00 17.5 25.0 32.5 μA
SCOMC, ISEL[1:0]=01 35 50 65 μA
SCOMC, ISEL[1:0]=10 70 100 130 μA
SCOMC, ISEL[1:0]=11 140 200 260 μA
VSCOM VDD/2 Voltage for LCD COM 5V No load 0.475 0.500 0.525 VDD
A.C. Characteristics
HT66F20-1/HT66F30-1
Ta=25˚C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
fCPU Operating Clock —
2.2V~5.5V DC — 8 MHz
2.7V~5.5V DC — 12 MHz
4.5V~5.5V DC — 20 MHz
fSYS System Clock (HXT) —
2.2V~5.5V 0.4 — 8 MHz
2.7V~5.5V 0.4 — 12 MHz
4.5V~5.5V 0.4 — 20 MHz
fHIRC System Clock (HIRC)
3V/5V Ta=25˚C -2% 4 +2% MHz
3V/5V Ta=25˚C -2% 8 +2% MHz
5V Ta=25˚C -2% 12 +2% MHz
3V/5V Ta=0~70˚C -5% 4 +5% MHz
3V/5V Ta=0~70˚C -4% 8 +4% MHz
5V Ta=0~70˚C -5% 12 +3% MHz
2.2V~3.6V Ta=0~70˚C -7% 4 +7% MHz
3.0V~5.5V Ta=0~70˚C -5% 4 +9% MHz
2.2V~3.6V Ta=0~70˚C -6% 8 +4% MHz
3.0V~5.5V Ta=0~70˚C -4% 8 +9% MHz
3.0V~5.5V Ta=0~70˚C -6% 12 +7% MHz
2.2V~3.6V Ta=-40˚C~85˚C -12% 4 +8% MHz
3.0V~5.5V Ta=-40˚C~85˚C -10% 4 +9% MHz
2.2V~3.6V Ta=-40˚C~85˚C -15% 8 +4% MHz
3.0V~5.5V Ta=-40˚C~85˚C -8% 8 +9% MHz
3.0V~5.5V Ta=-40˚C~85˚C -12% 12 +7% MHz

Rev. 1.40 20 November 23, 2016 Rev. 1.40 21 November 23, 2016
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
HT66F20-1/HT66F30-1/HT68F20-1/HT68F30-1
Flash MCU with EEPROM
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
fERC System Clock (ERC)
5V Ta=25˚C, R=120kΩ* -2% 8 +2% MHz
5V Ta=0~70˚C, R=120kΩ* -5% 8 +6% MHz
5V Ta=-40˚C~85˚C, R=120kΩ* -7% 8 +9% MHz
3.0V~5.5V Ta=-40˚C~85˚C, R=120kΩ* -9% 8 +10% MHz
2.2V~5.5V Ta=-40˚C~85˚C, R=120kΩ* -15% 8 +10% MHz
fLXT System Clock (LXT) — — — 32.768 — kHz
fLIRC System Clock (LIRC) 5V Ta=25˚C -10% 32 +10% kHz
2.2V~5.5V Ta=-40˚C~85˚C -50% 32 +60% kHz
fTIMER Timer Input Pin Frequency — — — — 1 fSYS
tRES External Reset Low Pulse Width — — 1 — — μs
tINT Interrupt Pulse Width — — 1 — — tSYS
tLVR Low Voltage Width to Reset — — 120 240 480 μs
tLVD Low Voltage Width to Interrupt — — 20 45 90 μs
tLVDS LVDO stable time — — 15 — — μs
tBGS VBG Turn on Stable Time — — 200 — — μs
tEERD EEPROM Read Time — — — 45 90 μs
tEEWR EEPROM Write Time — — — 2 4 ms
tSST
System Start-up Timer Period
(Wake-up from HALT) —
fSYS=HXT or LXT — 1024 —
tSYS
fSYS=ERC or HIRC — 15~16 —
fSYS=LIRC OSC — 1~2 —
Note:1.tSYS=1/fSYS
2.*ForfERC,astheresistortolerancewillinuencethefrequencyaprecisionresistorisrecommended.
3.TomaintaintheaccuracyoftheinternalHIRCoscillatorfrequency,a0.1μFdecouplingcapacitorshould
beconnectedbetweenVDDandVSSandlocatedasclosetothedeviceaspossible.