Holtek HT66FM5340 User manual

Brushless DC MCU with Pre-driver
HT66FM5340
Revision: V1.00 Date: December 07, 2018

Rev. 1.00 2 December 07, 2018 Rev. 1.00 3 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Table of Contents
Features................................................................................................................ 6
CPU Features ..............................................................................................................................6
Peripheral Features......................................................................................................................6
General Description............................................................................................. 7
Block Diagram...................................................................................................... 7
Pin Assignment.................................................................................................... 8
Pin Description .................................................................................................... 8
Absolute Maximum Ratings.............................................................................. 11
D.C. Characteristics........................................................................................... 11
Operating Voltage Characteristics ............................................................................................. 11
Standby Current Characteristics ................................................................................................ 11
Operating Current Characteristics..............................................................................................12
A.C. Characteristics........................................................................................... 12
High Speed Internal Oscillator – HIRC – Frequency Accuracy ..................................................12
Low Speed Internal Oscillator Characteristics – LIRC ...............................................................12
Operating Frequency Characteristic Curves ..............................................................................13
System Start Up Time Characteristics .......................................................................................13
Input/Output Characteristics ............................................................................ 14
LVR/LVD Electrical Characteristics .................................................................. 14
Low Dropout Regulator Electrical Characteristics......................................... 15
A/D Converter Electrical Characteristics......................................................... 16
D/A Converter Electrical Characteristics......................................................... 16
Operational Amplier Electrical Characteristics ............................................ 16
Comparators Electrical Characteristics .......................................................... 17
High Voltage I/O Electrical Characteristics ..................................................... 17
Power-on Reset Characteristics....................................................................... 18
System Architecture.......................................................................................... 18
Clocking and Pipelining..............................................................................................................18
Program Counter – PC...............................................................................................................19
Stack ..........................................................................................................................................20
Arithmetic and Logic Unit – ALU ................................................................................................20
Flash Program Memory..................................................................................... 21
Structure.....................................................................................................................................21
Special Vectors ..........................................................................................................................21
Look-up Table.............................................................................................................................21
Table Program Example.............................................................................................................22
In Circuit Programming – ICP ....................................................................................................23
On-Chip Debug Support – OCDS ..............................................................................................24

Rev. 1.00 2 December 07, 2018 Rev. 1.00 3 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Data Memory ...................................................................................................... 24
Structure.....................................................................................................................................24
Data Memory Addressing...........................................................................................................25
General Purpose Data Memory .................................................................................................25
Special Purpose Data Memory ..................................................................................................25
Special Function Register Description............................................................ 27
Indirect Addressing Registers – IAR0, IAR1, IAR2 ....................................................................27
Memory Pointers – MP0, MP1L, MP1H, MP2L, MP2H..............................................................27
Accumulator – ACC....................................................................................................................28
Program Counter Low Register – PCL.......................................................................................29
Look-up Table Registers – TBLP, TBHP, TBLH..........................................................................29
Status Register – STATUS .........................................................................................................29
Oscillators .......................................................................................................... 31
Oscillator Overview ....................................................................................................................31
System Clock Congurations.....................................................................................................31
Internal High Speed RC Oscillator – HIRC ................................................................................32
Internal 32kHz Oscillator – LIRC................................................................................................32
Operating Modes and System Clocks ............................................................. 32
System Clocks ...........................................................................................................................32
System Operation Modes...........................................................................................................34
Control Registers .......................................................................................................................35
Operating Mode Switching .........................................................................................................36
Standby Current Considerations ................................................................................................39
Wake-up.....................................................................................................................................39
Watchdog Timer................................................................................................. 40
Watchdog Timer Clock Source...................................................................................................40
Watchdog Timer Control Register ..............................................................................................40
Watchdog Timer Operation ........................................................................................................41
Reset and Initialisation...................................................................................... 42
Reset Functions .........................................................................................................................42
Reset Initial Conditions ..............................................................................................................44
Input/Output Ports ............................................................................................. 49
Pull-high Resistors .....................................................................................................................49
Port A Wake-up ..........................................................................................................................50
I/O Port Control Registers ..........................................................................................................50
Pin-shared Functions .................................................................................................................50
I/O Pin Structures.......................................................................................................................54
Programming Considerations.....................................................................................................54
Timer Modules – TM .......................................................................................... 55
Introduction ................................................................................................................................55
TM Operation .............................................................................................................................55
TM Clock Source........................................................................................................................55
TM Interrupts..............................................................................................................................56

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HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
TM External Pins........................................................................................................................56
Programming Considerations.....................................................................................................56
Periodic Type TM – PTM.................................................................................... 58
Periodic TM Operation ..............................................................................................................59
Periodic Type TM Register Description .....................................................................................60
Periodic Type TM Operating Modes ..........................................................................................67
Capture Timer Module – CAPTM ...................................................................... 81
Capture Timer Overview ............................................................................................................81
Capture Timer Register Description ..........................................................................................81
Capture Timer Operation............................................................................................................84
Noise Filter ......................................................................................................... 86
Noise Filter Register Description................................................................................................86
Analog to Digital Converter ............................................................................. 87
A/D Converter Overview ............................................................................................................87
A/D Converter Register Description ...........................................................................................88
A/D Converter Operation............................................................................................................91
Summary of A/D Conversion Steps............................................................................................92
Programming Considerations.....................................................................................................93
A/D Conversion Function ...........................................................................................................94
A/D Conversion Programming Examples...................................................................................94
Comparators ...................................................................................................... 96
Comparator Operation ...............................................................................................................96
Comparator Register..................................................................................................................97
Over Current Detection ..................................................................................... 98
Over Current Detect Functional Description ..............................................................................98
Over Current Detect Registers...................................................................................................98
BLDC Motor Control Circuit............................................................................ 101
Functional Description..............................................................................................................101
PWM Counter Control Circuit...................................................................................................102
Mask Function..........................................................................................................................107
Other Functions........................................................................................................................ 112
Hall Sensor Decoder ................................................................................................................ 114
Motor Protection Function ........................................................................................................121
Low Dropout Regulator – LDO ....................................................................... 126
High Voltage I/O Ports ..................................................................................... 127
High Voltage I/O Functional Description ..................................................................................128
High Voltage I/O Registers.......................................................................................................131
Low Voltage Detector ...................................................................................... 132
LVD Register ............................................................................................................................132
LVD Operation..........................................................................................................................132

Rev. 1.00 4 December 07, 2018 Rev. 1.00 5 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Interrupts .......................................................................................................... 133
Interrupt Registers....................................................................................................................133
Interrupt Operation ...................................................................................................................141
Hall Sensor Interrupts ..............................................................................................................142
External Interrupt 1...................................................................................................................143
Noise Filter Input Interrupt........................................................................................................143
Comparator 0 Interrupt.............................................................................................................144
Capture Timer Module Interrupts .............................................................................................144
Multi-function Interrupts............................................................................................................144
PWM Module Interrupts ...........................................................................................................144
A/D Converter Interrupts ..........................................................................................................145
TM Interrupts............................................................................................................................145
Time Base Interrupt..................................................................................................................146
LVD Interrupt ............................................................................................................................146
Interrupt Wake-up Function......................................................................................................147
Programming Considerations...................................................................................................147
Application Description .................................................................................. 148
Introduction .............................................................................................................................148
Functional Description .............................................................................................................148
Hardware Block Diagram .........................................................................................................149
Hardware Circuit ......................................................................................................................151
Instruction Set.................................................................................................. 153
Introduction ..............................................................................................................................153
Instruction Timing .....................................................................................................................153
Moving and Transferring Data..................................................................................................153
Arithmetic Operations...............................................................................................................153
Logical and Rotate Operation ..................................................................................................154
Branches and Control Transfer ................................................................................................154
Bit Operations ..........................................................................................................................154
Table Read Operations ............................................................................................................154
Other Operations......................................................................................................................154
Instruction Set Summary ................................................................................ 155
Table Conventions....................................................................................................................155
Extended Instruction Set ..........................................................................................................157
Instruction Denition....................................................................................... 159
Extended Instruction Denition ................................................................................................168
Package Information ....................................................................................... 175
24-pin SSOP (150mil) Outline Dimensions ..............................................................................176

Rev. 1.00 6 December 07, 2018 Rev. 1.00 7 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Features
CPU Features
• Operating voltage
♦fSYS=32kHz~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 types
♦Internal High Speed 20MHz RC – HIRC
♦Internal Low Speed 32kHz RC – LIRC
• Internal oscillators require no external components
• Multi-mode operation: FAST, SLOW, IDLE and SLEEP
• All instructions executed in 1~3 instruction cycles
• Table read instructions
• 115 powerful instructions
• 8-level subroutine nesting
• Bit manipulation instruction
Peripheral Features
• Flash Program Memory: 4K×16
• RAM Data Memory: 256×8
•Watchdog Timer function
• 19 bidirectional I/O lines
• 6 bidirectional High Voltage I/O lines with pre-driver combinational circuit
• Five pin-shared external interrupt inputs – H1, H2, H3, NFIN and INT1
•Multiple Timer Modules for time measurement, input capture, compare match output, PWM
output or single pulse output function
• Single 16-bit Capture Timer Module for motor protection
• Single 10-bit PWM generators, supporting edge/center aligned mode
• 6+2 channel 12-bit resolution A/D converter
•Over current detection – Operational Amplifier, Comparator 0 and 8-bit D/A converter
• Internal 5V LDO
• Four comparators
•Time-Base function for generation of fixed time interrupt signals
• Low voltage reset function
• Low voltage detect function
• Package type: 24-pin SSOP

Rev. 1.00 6 December 07, 2018 Rev. 1.00 7 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
General Description
The HT66FM5340 is a Flash Memory 8-bit high performance RISC architecture microcontroller,
which includes a host of fully integrated special features specifically designed for brushless DC
motor applications.
The device includes an internal LDO (Low Dropout Regulator) for voltage regulation with a 12V
input and 5V output as well as an internal pre-driver which provides a 12V high voltage output,
which can directly drive a P-N MOSFET driver or a BLCD motor.
In addition to the advantages of low power consumption and I/O exibility, the device also includes
multiple and extremely exibile Timer Modules, internal oscillators, multi-channel A/D converter,
D/A converter, Operational Amplifier, Pulse Width Modulation function, 16-bit Capture Timer
Module function, Comparators, Motor Protect Module, Hall sensor position detect function, Time
Base function, Low Voltage Reset, Low Voltage Detect, power-down and wake-up functions.
Although especially designed for brushless DC motor applications, the enhanced versatility of
this device also makes it applicable for use in a wide range of A/D application possibilities such
as sensor signal processing, motor driving, industrial controllers, consumer products, subsystem
controllers, ect,.
Block Diagram
HIRC
20MHz
LIRC
32kHz
MUX
HT8 MCU Core
Reset
Circuit
Interrupt
Controller
INT1
ROM
4K × 16
LVD/LVR
Watchdog
Timer
RAM
256 × 8
Stack
8-Level
HT8-4T
SYSCLK
Bus
Digital Peripherals
PTM3
Time Base
12-bit
ADC
Pin-Shared
With Port A&B
VDD
AN0~AN2,
AN4&AN6&AN7
PTM0
PTM2PTM1
Pin-Shared
Function
Port A
Driver
Port B
Driver
PA0~PA7
PB0~PB5
BLDC Motor Control Peripherals
: Pin-Shared Node
AP
Pin-Shared
With Port A
MUX
OPA
8-bit
DAC
+
-Over Current
Detection Circuit
Analog
Digital
Converter
Noise
Filter NFIN
Pin-Shared
With Port A&B
Position Detection Circuit
MUX
+
+
+
-
Hall Noise
Filter
Motor
Protect
Circuit
Motor
Control
Circuit
Pin-Shared
With Port A&B
Pin-Shared
With Port A
GAT
GAB
GBT
GBB
GCT
GCB
H1
H2
H3
C1P~C3P
C1N~C3N
Pin-Shared
With Port A&B
CMP0
Analog Peripherals
CAPTM
Data
Non-overlap
Level
Shift
Pre-
driver
Voltage
Detector
VCCO=VIN×0.2
Pre-driver Circuit×3
VCC1 VCC1
VSS1 VSS1
VCC1
VCCO
High Voltage Peripherals
Clock System
LDO VDD
VCC
2
VDD
VSS VSS
VDD
I/O
VCCO
OPAO

Rev. 1.00 8 December 07, 2018 Rev. 1.00 9 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Pin Assignment
HT66FM5340/HT66VM5340
24 SSOP-A
PA6/[NFIN]/[CTIN]/PTCK1/AN7/VCCO
PA3/H1/PTP1I/C1P
PA4/H2/PTP2I/C2P/PTP1/PTP2
PA5/H3/PTP3I/C3P/PTP2/PTP1
PB1/CTIN/PTCK2/[INT1]/AN2/HBO/PTP2
PA7/NFIN/INT1/AN6/HAO/OPAO
PA1/PTP0I/[CTIN]/AN4/AP
PB2/PTCK0/PTCK3/[NFIN]/AN1/HCO/PTP2
VSS
VDD
GAB
GBB
GBT
VCC2
VSS1
GCT
GCB
PA0/PTP3/PTP1/OCDSDA/ICPDA
GAT
PB4/C2N/PTP0/PTP3
PB5/C1N/CPN/PTP0
PA2/PTP1/PTP3/OCDSCK/ICPCK
PB3/C3N/AN0/PTP3
VCC1
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
Note: 1. Bracketed pin names indicate non-default pinout remapping locations. The detailed information can be
referenced to the relevant chapter.
2. If the pin-shared pin functions have multiple outputs, the desired pin-shared function is determined by its
corresponding software control bits.
3. The OCDSDA and OCDSCK pins are supplied as dedicated OCDS pins and as such only available for
the HT66VM5340 device which is the OCDS EV chip for the HT66FM5340 device.
4. For the less pin count package type there will be unbounded pins which should be properly congured
to avoid unwanted power consumption resulting from oating input conditions. Refer to the “Standby
Current Considerations” and “Input/Output Ports” sections.
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.
Pin Name Function OPT I/T O/T Description
PA0/PTP3/PTP1/
OCDSDA/ICPDA
PA0
PAPU
PAWU
PAPS0
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
PTP3 PAPS0 — CMOS PTM3 output
PTP1 PAPS0 — CMOS PTM1 output
OCDSDA — ST CMOS OCDS data/address pin, for EV chip only
ICPDA — ST CMOS ICP data/address pin
PA1/PTP0I/[CTIN]/
AN4/AP
PA1
PAPU
PAWU
PAPS0
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
PTP0I PAPS0 ST — PTM0 input
CTIN PRM
PAPS0 ST — CAPTM input
AN4 PAPS0 AN — A/D Converter external input channel 4
AP PAPS0 AN — Positive input of OPA
PA2/PTP1/PTP3/
OCDSCK/ICPCK
PA2
PAPU
PAWU
PAPS0
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
PTP1 PAPS0 — CMOS PTM1 output
PTP3 PAPS0 — CMOS PTM3 output
ICPCK — ST — ICP clock bus
OCDSCK — ST — OCDS clock bus, for EV chip only

Rev. 1.00 8 December 07, 2018 Rev. 1.00 9 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Pin Name Function OPT I/T O/T Description
PA3/H1/PTP1I/C1P
PA3
PAPU
PAWU
PAPS0
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
H1 PAPS0 ST — Hall sensor input
PTP1I PAPS0 ST — PTM1 input
C1P PAPS0 ST — Comparator 1 positive input
PA4/H2/PTP2I/C2P/
PTP1/PTP2
PA4
PAPU
PAWU
PAPS1
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
H2 PAPS1 ST — Hall sensor input
PTP2I PAPS1 ST — PTM2 input
C2P PAPS1 ST — Comparator 2 positive input
PTP1 PAPS1 — CMOS PTM1 output
PTP2 PAPS1 — CMOS PTM2 output
PA5/H3/PTP3I/C3P/
PTP2/PTP1
PA5
PAPU
PAWU
PAPS1
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
H3 PAPS1 ST — Hall sensor input
PTP3I PAPS1 ST — PTM3 input
C3P PAPS1 ST — Comparator 3 positive input
PTP2 PAPS1 — CMOS PTM2 output
PTP1 PAPS1 — CMOS PTM1 output
PA6/[NFIN]/[CTIN]/
PTCK1/AN7/VCCO
PA6
PAPU
PAWU
PAPS1
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
NFIN PRM
PAPS1 ST — Noise Filter input
CTIN PRM
PAPS1 ST — CAPTM input
PTCK1 PAPS1 ST — PTM1 clock input
AN7 PAPS1 AN — A/D Converter external input channel 7
VCCO PAPS1 — CMOS VCC DET output
PA7/NFIN/INT1/
AN6/HAO/OPAO
PA7
PAPU
PAWU
PAPS1
ST CMOS General purpose I/O. Register enabled pull-up and
wake-up
NFIN PRM
PAPS1 ST — External Noise Filter input
INT1
PRM
INTEG
PAPS1
ST — External interrupt 1 input
AN6 PAPS1 AN — A/D Converter external input channel 6
HAO PAPS1 — CMOS Test pin for SA
OPAO PAPS1 — AN OPA output
PB1/CTIN/PTCK2/
[INT1]/AN2/HBO/PTP2
PB1 PBPU
PBPS0 ST CMOS General purpose I/O. Register enabled pull-up
CTIN PRM
PBPS0 ST — CAPTM input
PTCK2 PBPS0 ST — PTM2 clock input
INT1 PRM
INTEG ST — External interrupt 1 input
AN2 PBPS0 AN — A/D Converter external input channel 2
HBO PBPS0 — CMOS Test pin for SB
PTP2 PBPS0 — CMOS PTM2 output

Rev. 1.00 10 December 07, 2018 Rev. 1.00 11 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Pin Name Function OPT I/T O/T Description
PB2/PTCK0/PTCK3/
[NFIN]/AN1/HCO/PTP2
PB2 PBPU
PBPS0 ST CMOS General purpose I/O. Register enabled pull-up
PTCK0 PBPS0 ST — PTM0 clock input
PTCK3 PBPS0 ST — PTM3 clock input
NFIN PRM
PBPS0 ST — External Noise Filter input
AN1 PBPS0 AN — A/D Converter external input channel 1
HCO PBPS0 — CMOS Test pin for SC
PTP2 PBPS0 — CMOS PTM2 output
PB3/C3N/AN0/PTP3
PB3 PBPU
PBPS0 ST CMOS General purpose I/O. Register enabled pull-up
C3N PBPS0 ST — Comparator 3 negative input
AN0 PBPS0 AN — A/D Converter external input channel 0
PTP3 PBPS0 — CMOS PTM3 output
PB4/C2N/PTP0/PTP3
PB4 PBPU
PBPS1 ST CMOS General purpose I/O. Register enabled pull-up
C2N PBPS1 ST — Comparator 2 negative input
PTP0 PBPS1 — CMOS PTM0 output
PTP3 PBPS1 — CMOS PTM3 output
PB5/C1N/CPN/PTP0
PB5 PBPU
PBPS1 ST CMOS General purpose I/O. Register enabled pull-up
C1N PBPS1 ST — Comparator 1 negative input
CPN PBPS1 ST — Comparator 1, 2, 3 negative input
PTP0 PBPS1 — CMOS PTM0 output
GAT GAT GATEC — AN Phase A high side P-MOSFET driver
GAB GAB GATEC — AN Phase A low side N-MOSFET driver
GBT GBT GATEC — AN Phase B high side P-MOSFET driver
GBB GBB GATEC — AN Phase B low side N-MOSFET driver
GCT GCT GATEC — AN Phase C high side P-MOSFET driver
GCB GCB GATEC — AN Phase C low side N-MOSFET driver
VDD VDD — PWR — Digital positive power supply
VCC1 VCC1 — PWR — High voltage driver positive power supply
VCC2 VCC2 — PWR — LDO input
VSS VSS — PWR — Digital negative power supply, ground
VSS1 VSS1 — PWR — High voltage driver negative power supply, ground
Legend: I/T: Input type; O/T: Output type;
OPT: Optional by register option; PWR: Power;
ST: Schmitt Trigger input; CMOS: CMOS output;
AN: Analog signal.

Rev. 1.00 10 December 07, 2018 Rev. 1.00 11 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Absolute Maximum Ratings
Supply Voltage (VCC1, VCC2)........................................................................................VSS-0.3V to 15V
Supply Voltage (VDD).................................................................................................VSS-0.3V to 6.0V
High Voltage Input Voltage .............................................................................. VSS-0.3V to VCC1+0.3V
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 the device. Functional operation of the
device at other conditions beyond those listed in the specication is not implied and prolonged
exposure to extreme conditions may affect device reliability.
D.C. Characteristics
For data in the following tables, note that factors such as oscillator type, operating voltage, operating
frequency, pin load conditions, temperature and program instruction type, etc., can all exert an
inuence on the measured values.
Operating Voltage Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD
Operating Voltage – HIRC fSYS=fHIRC=20MHz 4.5 — 5.5 V
fSYS=fHIRC/64=312.5kHz 3.15 — 5.5
Operating Voltage – LIRC fSYS=fLIRC=32kHz 3.15 — 5.5 V
Standby Current Characteristics
Ta=-40°C~85°C
Symbol Standby Mode Test Conditions Min. Typ. Max. Unit
VDD Conditions
ISTB
SLEEP Mode 5V LIRC & LVR on, LVD off, WDT on — 60 100 μA
IDLE0 Mode – LIRC 5V fSUB on — 5 10 μA
IDLE1 Mode – HIRC 5V fSUB on, fSYS=fHIRC=20MHz — 400 500 μA
Note: When using the characteristic table data, the following notes should be taken into consideration:
1. Any digital inputs are setup in a non-oating condition.
2. All measurements are taken under conditions of no load and with all peripherals in an off state.
3. There are no DC current paths.
4. All Standby Current values are taken after a HALT instruction execution thus stopping all instruction
execution.

Rev. 1.00 12 December 07, 2018 Rev. 1.00 13 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Operating Current Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
IDD Operating Current – HIRC 5V fSYS=fHIRC=20MHz — 9 12 mA
IHIRC Additional Current for HIRC Enable 5V fHIRC=20MHz — 570 860 μA
Note: When using the characteristic table data, the following notes should be taken into consideration:
1. Any digital inputs are setup in a non-oating condition.
2. All measurements are taken under conditions of no load and with all peripherals in an off state.
3. There are no DC current paths.
4. All Operating Current values are measured using a continuous NOP instruction program loop.
A.C. Characteristics
For data in the following tables, note that factors such as oscillator type, operating voltage, operating
frequency and temperature etc., can all exert an inuence on the measured values.
High Speed Internal Oscillator – HIRC – Frequency Accuracy
During the program writing operation the writer will trim the HIRC oscillator at a user selected
HIRC frequency and user selected voltage of 5V.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Temp.
fHIRC
20MHz Writer Trimmed HIRC
Frequency
5V Ta=25°C -1% 20 +1%
MHz
Ta=-40°C~85°C -2% 20 +2%
4.5V~5.5V Ta=25°C -2.5% 20 +2.5%
Ta=-40°C~85°C -3% 20 +3%
Note: 1. The 5V value for VDD is provided as this is the xed voltage at which the HIRC frequency is trimmed by the
writer.
2. The row below the 5V trim voltage row is provided to show the values for the full VDD range operating voltage.
Low Speed Internal Oscillator Characteristics – LIRC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Temp.
fLIRC LIRC Frequency 5V Ta=25°C -10% 32 +10% kHz
5V ± 0.5V Ta=-40°C~85°C -40% 32 +40%

Rev. 1.00 12 December 07, 2018 Rev. 1.00 13 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Operating Frequency Characteristic Curves
System Operating Frequency
Operating Voltage
20MHz
~ ~
4.5V 5.5V
~
~
~ ~
System Start Up Time Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
tSST
System Start-up Time
Wake-up from condition where fSYS is off
— fSYS=fH~ fH/64, fH=fHIRC — 16 — tHIRC
— fSYS=fSUB=fLIRC — 2 — tLIRC
System Start-up Time
Wake-up from condition where fSYS is on
— fSYS=fH~ fH/64, fH=fHIRC — 2 — tH
— fSYS=fSUB=fLIRC — 2 — tSUB
System Speed Switch Time
FAST to SLOW Mode or SLOW to FAST
Mode
—fHIRC switches from off → on
(HTO=1) — 16 — tHIRC
System start-up Time
(WDT time-out hardware cold reset) — — — 0 — tH
tRSTD
System Reset Delay Time
Reset source from Power-on reset, LVR
hardware reset or LVRC/WDTC software
reset
— — 25 50 100 ms
System Reset Delay Time
WDT time-out hardware cold reset — — 8.3 16.7 33.3 ms
tSRESET Minimum Software Reset Width to Reset — — 45 90 120 μs
Note: 1. For the System Start-up time values, whether fSYS is on or off depends upon the mode type and the chosen
fSYS system oscillator. Details are provided in the System Operating Modes section.
2. The time units, shown by the symbols tHIRC, tSYS etc. are the inverse of the corresponding frequency values
as provided in the frequency tables. For example tHIRC=1/fHIRC, tSYS=1/fSYS etc.
3. The System Speed Switch Time is effectively the time taken for the newly activated oscillator to start up.

Rev. 1.00 14 December 07, 2018 Rev. 1.00 15 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Input/Output Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VIL Input Low Voltage for I/O Ports 5V — 0 — 0.3VDD V
VIH Input High Voltage for I/O Ports 5V — 0.7VDD — VDD V
IOL Sink Current for I/O Ports 5V VOL=0.1VDD 32 65 — mA
IOH Source Current for I/O Ports 5V VOH=0.9VDD -8 -16 — mA
RPH Pull-high Resistance for I/O Ports(Note) 5V — 10 30 50 kΩ
tTCK PTCKn Input Pin Minimum Pulse Width — — 0.3 — — μs
tTPI
PTP0I Input Pin Minimum Pulse Width — — 0.1 — — μs
PTP1I~PTP3I Input Pin Minimum Pulse Width — — 0.3 — — μs
tINT External Interrupt Minimum Pulse Width — — 1 5.0 10 μs
fTMCLK PTMn Maximum Timer Clock Source Frequency 5V — — — 1 fSYS
Note: The RPH internal pull high resistance value is calculated by connecting to ground and enabling the input
pin with a pull-high resistor and then measuring the input sink current at the specied supply voltage level.
Dividing the voltage by this measured current provides the RPH value.
LVR/LVD Electrical Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VLVR Low Voltage Reset Voltage — LVR enable, voltage select 3.15V -5% 3.15 +5% V
VLVD Low Voltage Detection Voltage — LVD enable, voltage select 3.6V -5% 3.6 +5% V
ILVD Additional Current for LVD Enable 5V — — — 70 μA
tLVDS LVDO Stable Time —For LVR enable, LVD off → on — — 15 μs
tLVR
Minimum Low Voltage Width to
Reset — — 120 240 480 μs
tLVD
Minimum Low Voltage Width to
Interrupt — — 60 120 240 μs

Rev. 1.00 14 December 07, 2018 Rev. 1.00 15 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Low Dropout Regulator Electrical Characteristics
VIN=VOUT+1V, Ta=-40°C~85°C, unless otherwise specied
CLOAD=10μF+0.1μF
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VIN Conditions
VIN Input Voltage — — VOUT+0.1 6 15 V
VOUT Output Voltage —Ta=25°C,
ILOAD=1mA, VOUT=5.0V -2% 5.0 2% V
— ILOAD=1mA, VOUT=5.0V -3% 5.0 3%
ΔVLOAD Load Regulation(1) —1mA≤ILOAD≤70mA, — 0.02 0.05 %/mA
VDROP Dropout Voltage(2) —VOUT=5V, ΔVOUT=-2%
ILOAD=50mA — 150 300 mV
— 3V<VIN<5.1V, ILOAD=50mA — 300 600
IOUT Output Current —ΔVOUT=-3% 70 — — mA
— VIN=VOUT+2V, ΔVOUT=-5% 100 — —
IQQuiescent Current 12V No load — 3 8 μA
ΔVLINE Line Regulation — VOUT+1V≤VIN≤12V, ILOAD=1mA — — 0.5 %/V
TC Temperature Coefcient — ILOAD=10mA — ±1.5 ±2 mV/°C
ΔVOUT_RIPPLE Output Voltage Ripple 6V ILOAD=10mA — — 10 mV
RR Ripple Rejection(3) —VIN=10VDC+2VP-P(AC),
ILOAD≤50mA, f=120Hz 35 — — dB
ILIMIT Current Limit 6V ΔVOUT=-10% 150 — — mA
tSTART LDO Startup Time 6V ILOAD=1mA, VOUT=5V±5% — — 10 ms
Note: 1. Load regulation is measured at a constant junction temperature, using pulse testing with a low ON time
and is guaranteed up to the maximum power dissipation. Power dissipation is determined by the input/
output differential voltage and the output current. Guaranteed maximum power dissipation will not be
available over the full input/output range. The maximum allowable power dissipation at any ambient
temperature is PD=(TJ(MAX)-Ta)/θJA.
2. Dropout voltage is dened as the input voltage minus the output voltage that produces a 2% change in the
output voltage from the value at appointed VIN.
3. Ripple rejection ratio measurement circuit. RR=20×log(ΔVIN/ΔVOUT). CIN=10μF, COUT=10μF+0.1μF.
CIN
1 3
2COUT RL
Output
GND
LDO
VIN VOUT
AC
4. Application information for LDO load capacitor selection for stability.

Rev. 1.00 16 December 07, 2018 Rev. 1.00 17 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
A/D Converter Electrical Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD A/D Converter Operating Voltage — — VLVR 5.0 5.5 V
IOP Additional Current for A/D Converter Enable 5V — — 0.6 — mA
ISTB A/D Converter Standby Current — Digital input no change — — 4 μA
VREF A/D Converter Reference Voltage — — 2 VDD VDD+0.1 V
tCONV
A/D Conversion Time
(Including Sample and Hold time) — — — 16 — tADCK
DNL A/D Differential Non-linearity
4.5V VREF=VDD, no load,
tADCK=0.8μs
-2 — +3 LSB
5.5V
4.5V VREF=VDD, no load,
tADCK=12.8μs
5.5V
INL A/D Integral Non-linearity
4.5V VREF=VDD, no load,
tADCK=0.8μs
-4 — +4 LSB
5.5V
4.5V VREF=VDD, no load,
tADCK=12.8μs
5.5V
tADCK A/D Converter Clock Period — — 0.8 — 12.8 μs
tCKH A/D Converter Clock High Pulse — — 225 — — ns
tCKL A/D Converter Clock Low Pulse — — 225 — — ns
tST
A/D Converter Turn-on Setup Time — — 2 — — ns
A/D Converter Start Bit Setup Time — — 2 — —
tSTH A/D Converter Start Bit High Pulse — — 25 — — ns
tDEOC End of Conversion Output Delay — VDD=5V — 3 — ns
tDOUT Conversion Data Output Delay — VDD=5V — 3 — ns
tON A/D Converter Wake-up Time — — — — 2 μs
tOFF A/D Converter Sleep Time — — — — 5 ns
D/A Converter Electrical Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VDD D/A Converter Operating Voltage — — VLVR — 5.5 V
VDA D/A Converter Output Voltage — OPCM[7:0]=00H~FFH, no load 0.01 — 0.99 VDD
tDAC D/A Conversion Time — VDD=5V, CL=10pF — — 2 μs
ROD/A Output Resistance — — — 10 — kΩ
Operational Amplier Electrical Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VOPR OPA Operating Voltage 5V — VLVR 5.0 5.5 V
IOFF Power Down Current 5V — — — 0.1 μA
VOPOS Input Offset Voltage 5V Without calibration,
AOF[4:0]=10000B -15 — +15 mV
5V With calibration -2 — +2

Rev. 1.00 16 December 07, 2018 Rev. 1.00 17 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VRI PGA Input Voltage Range
3.3V Gain=1, Ga<±5% VSS+0.1 — VDD-1.4
V
5V VSS+0.1 — VDD-1.4
3.3V Gain=5, 10, 20
Ga<±5%
VSS+0.1 — VOR(Max)/Gain
5V VSS+0.1 — VOR(Max)/Gain
VOR
OPA Maximum Output Voltage
Range
3.3V — VSS+0.1 — VDD-0.1 V
5V — VSS+0.1 — VDD-0.1
PSRR Power Supply Rejection Ratio 5V — 90 — 96 dB
CMRR Common Mode Rejection Ratio 5V VCM=0~(VDD-1.4V) — 106 — dB
SR Slew Rate+, Slew Rate- 5V No load 1.29 2.18 — V/μs
GBW Gain Bandwidth 5V RL=600Ω, CL=100pF 2.05 3.70 7.16 MHz
AOL Open Loop Gain 5V RL=600Ω, CL=100pF — 96 — dB
PM Phase Margin 5V RL=600Ω, CL=100pF — 90 — Deg
Comparators Electrical Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Condition Min. Typ. Max. Unit
VDD Conditions
VCMP Comparator Operating Voltage 5V — VLVR 5.0 5.5 V
ICMP Comparator Operating Current 5V — — 300 450 μA
IOFF Comparator Power Down Current 5V Comparator disabled — — 0.1 μA
VCMPOS Comparator Input Offset Voltage 5V — -10 — +10 mV
VHYS Hysteresis 5V Comparator 0 50 100 150 mV
5V Comparator 1, 2, 3 20 40 60
VCM Input Common Mode Voltage Range — — VSS – VDD-1.4 V
AOL Comparator Open Loop Gain — — 100 120 – dB
tPD Comparator Response Time 5V
VM=0~(VDD-1.4)V
With 10mV overdrive — — 1 μs
With 100mV overdrive(Note) — — 200 ns
Note: Measured with comparator one input pin at VM=(VDD-1.4)/2 while the other pin input transition from VSS to
(VM+100mV) or from VDD to (VM-100mV).
High Voltage I/O Electrical Characteristics
Ta=-40°C to 85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VIN Input Voltage — — 6 — 15 V
IOH Source Current for HVO Pins — VOH=0.9×VIN, VIN=12V -90 -160 — mA
— VOH=0.9×VIN, VIN=6V -40 -80 — mA
IOL Sink Current for HVO Pins — VOL=0.1×VIN, VIN=12V 90 160 — mA
— VOL=0.1×VIN, VIN=6V 40 80 — mA
VCCO VCC DET Output — VIN=12V -5 — +5 %
Note: VCCO=0.2×VIN.

Rev. 1.00 18 December 07, 2018 Rev. 1.00 19 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Power-on Reset Characteristics
Ta=-40°C~85°C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VDD Conditions
VPOR VDD Start Voltage to Ensure Power-on Reset — — — — 100 mV
RRPOR VDD Rising Rate to Ensure Power-on Reset — — 0.035 — — V/ms
tPOR
Minimum Time for VDD Stays at VPOR to
Ensure Power-on Reset — — 1 — — ms
VDD
tPOR RRPOR
VPOR
Time
System Architecture
A key factor in the high-performance features of the Holtek range of microcontrollers is attributed to
their internal system architecture. The range of the device take advantage of the usual features found
within RISC microcontrollers providing increased speed of operation and enhanced performance.
The pipelining scheme is implemented in such a way that instruction fetching and instruction
execution are overlapped, hence instructions are effectively executed in one or two cycles for
most of the standard or extended instructions respectively, with the exception of branch or call
instructions which needs one more cycle. An 8-bit wide ALU is used in practically all instruction set
operations, which carries out arithmetic operations, logic operations, rotation, increment, decrement,
branch decisions, etc. The internal data path is simplied by moving data through the Accumulator
and the ALU. Certain internal registers are implemented in the Data Memory and can be directly
or indirectly addressed. The simple addressing methods of these registers along with additional
architectural features ensure that a minimum of external components is required to provide a
functional I/O and A/D control system with maximum reliability and flexibility. This makes the
device suitable for low-cost, high-volume production for controller applications.
Clocking and Pipelining
The main system clock, derived from either a HIRC or LIRC oscillator is subdivided into four
internally generated non-overlapping clocks, T1~T4. The Program Counter is incremented at the
beginning of the T1 clock during which time a new instruction is fetched. The remaining T2~T4
clocks carry out the decoding and execution functions. In this way, one T1~T4 clock cycle forms
one instruction cycle. Although the fetching and execution of instructions takes place in consecutive
instruction cycles, the pipelining structure of the microcontroller ensures that instructions are
effectively executed in one instruction cycle. The exception to this are instructions where the
contents of the Program Counter are changed, such as subroutine calls or jumps, in which case the
instruction will take one more instruction cycle to execute.
For instructions involving branches, such as jump or call instructions, two machine cycles are
required to complete instruction execution. An extra cycle is required as the program takes one
cycle to rst obtain the actual jump or call address and then another cycle to actually execute the
branch. The requirement for this extra cycle should be taken into account by programmers in timing
sensitive applications.

Rev. 1.00 18 December 07, 2018 Rev. 1.00 19 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Fetch Inst. (PC)
(System Clock)
fSYS
Phase Clock T1
Phase Clock T2
Phase Clock T3
Phase Clock T4
Program Counter
PC PC+1 PC+2
Pipelining Execute Inst. (PC-1) Fetch Inst. (PC+1)
Execute Inst. (PC) Fetch Inst. (PC+2)
Execute Inst. (PC+1)
System Clock and Pipelining
Fetch Inst. 1
1 MOV A,[12H]
2 CALL DELAY
3 CPL [12H]
4 :
5 :
6 DELAY: NOP
Execute Inst. 1
Fetch Inst. 2 Execute Inst. 2
Fetch Inst. 3 Flush Pipeline
Fetch Inst. 6 Execute Inst. 6
Fetch Inst. 7
Instruction Fetching
Program Counter – PC
During program execution, the Program Counter is used to keep track of the address of the
next instruction to be executed. It is automatically incremented by one each time an instruction
is executed except for instructions, such as “JMP” or “CALL” that demand a jump to a non-
consecutive Program Memory address. Only the lower 8 bits, known as the Program Counter Low
Register, are directly addressable by the application program.
When executing instructions requiring jumps to non-consecutive addresses such as a jump instruction,
a subroutine call, interrupt or reset, etc., the microcontroller manages program control by loading
the required address into the Program Counter. For conditional skip instructions, once the condition
has been met, the next instruction, which has already been fetched during the present instruction
execution, is discarded and a dummy cycle takes its place while the correct instruction is obtained.
Program Counter
High Byte Low Byte (PCL)
PC11~PC8 PCL7~PCL0
Program Counter
The lower byte of the Program Counter, known as the Program Counter Low register or PCL, is
available for program control and is a readable and writeable register. By transferring data directly
into this register, a short program jump can be executed directly; however, as only this low byte
is available for manipulation, the jumps are limited to the present page of memory that is 256
locations. When such program jumps are executed it should also be noted that a dummy cycle
will be inserted. Manipulating the PCL register may cause program branching, so an extra cycle is
needed to pre-fetch.

Rev. 1.00 20 December 07, 2018 Rev. 1.00 21 December 07, 2018
HT66FM5340
Brushless DC MCU with Pre-driver
HT66FM5340
Brushless DC MCU with Pre-driver
Stack
This is a special part of the memory which is used to save the contents of the Program Counter only.
For this device the stack has 8 levels and neither part of the data nor part of the program space,
and is neither readable nor writeable. The activated level is indexed by the Stack Pointer, and is
neither readable nor writeable. At a subroutine call or interrupt acknowledge signal, the contents of
the Program Counter are pushed onto the stack. At the end of a subroutine or an interrupt routine,
signaled by a return instruction, RET or RETI, the Program Counter is restored to its previous value
from the stack. After a device reset, the Stack Pointer will point to the top of the stack.
If the stack is full and an enabled interrupt takes place, the interrupt request ag will be recorded but
the acknowledge signal will be inhibited. When the Stack Pointer is decremented, by RET or RETI,
the interrupt will be serviced. This feature prevents stack overow allowing the programmer to use
the structure more easily. However, when the stack is full, a CALL subroutine instruction can still
be executed which will result in a stack overow. Precautions should be taken to avoid such cases
which might cause unpredictable program branching.
If the stack is overow, the rst Program Counter save in the stack will be lost.
Stack
Pointer
Stack Level 2
Stack Level 1
Stack Level 3
:
:
:
Stack Level 8
Program Memory
Program Counter
Bottom of Stack
Top of Stack
Arithmetic and Logic Unit – ALU
The arithmetic-logic unit or ALU is a critical area of the microcontroller that carries out arithmetic
and logic operations of the instruction set. Connected to the main microcontroller data bus, the ALU
receives related instruction codes and performs the required arithmetic or logical operations after
which the result will be placed in the specied register. As these ALU calculation or operations may
result in carry, borrow or other status changes, the status register will be correspondingly updated to
reect these changes. The ALU supports the following functions:
• Arithmetic operations:
ADD, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA,
LADD, LADDM, LADC, LADCM, LSUB, LSUBM, LSBC, LSBCM, LDAA
• Logic operations:
AND, OR, XOR, ANDM, ORM, XORM, CPL, CPLA,
LAND, LANDM, LOR, LORM, LXOR, LXORM, LCPL, LCPLA
• Rotation:
RRA, RR, RRCA, RRC, RLA, RL, RLCA, RLC,
LRR, LRRA, LRRCA, LRRC, LRLA, LRL, LRLCA, LRLC
• Increment and Decrement:
INCA, INC, DECA, DEC,
LINCA, LINC, LDECA, LDEC
• Branch decision:
JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA, CALL, RET, RETI,
LSNZ, LSZ, LSZA, LSIZ, LSIZA, LSDZ, LSDZA