HT66F002/HT66F003/HT66F004

Cost-Effective A/D Flash 8-Bit MCU with EEPROM
HT66F002/HT66F003/HT66F004
Revision: V1.10
Date: ������������������
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Table of Contents
Features............................................................................................................. 6
CPU Features.......................................................................................................................... 6
Peripheral Features.................................................................................................................. 6
General Description.......................................................................................... 7
Selection Table.................................................................................................. 7
Block Diagram................................................................................................... 8
Pin Assignment................................................................................................. 8
Pin Description............................................................................................... 10
Absolute Maximum Ratings........................................................................... 14
D.C. Characteristics........................................................................................ 15
A.C. Characteristics........................................................................................ 16
ADC Electrical Characteristics...................................................................... 17
LVR Electrical Characteristics....................................................................... 18
LCD Electrical Characteristics...................................................................... 18
Power on Reset Electrical Characteristics................................................... 18
System Architecture....................................................................................... 19
Clocking and Pipelining.......................................................................................................... 19
Program Counter.................................................................................................................... 20
Stack...................................................................................................................................... 21
Arithmetic and Logic Unit – ALU............................................................................................ 21
Flash Program Memory.................................................................................. 22
Structure................................................................................................................................. 22
Special Vectors...................................................................................................................... 22
Look-up Table......................................................................................................................... 22
Table Program Example......................................................................................................... 23
In Circuit Programming.......................................................................................................... 24
On-Chip Debug Support – OCDS.......................................................................................... 25
RAM Data Memory.......................................................................................... 25
Structure................................................................................................................................. 25
General Purpose Data Memory............................................................................................. 25
Special Purpose Data Memory.............................................................................................. 26
Special Function Register Description......................................................... 29
Indirect Addressing Registers – IAR0, IAR1.......................................................................... 29
Memory Pointers – MP0, MP1............................................................................................... 29
Bank Pointer – BP.................................................................................................................. 30
Accumulator – ACC................................................................................................................ 30
Program Counter Low Register – PCL................................................................................... 30
Look-up Table Registers – TBLP, TBLH................................................................................. 30
Status Register – STATUS..................................................................................................... 31
Rev. 1.10
2
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
EEPROM Data Memory................................................................................... 32
EEPROM Data Memory Structure......................................................................................... 32
EEPROM Registers............................................................................................................... 33
Reading Data from the EEPROM ......................................................................................... 34
Writing Data to the EEPROM................................................................................................. 35
Write Protection...................................................................................................................... 35
EEPROM Interrupt................................................................................................................. 35
Programming Considerations................................................................................................. 36
Oscillator......................................................................................................... 37
Oscillator Overview................................................................................................................ 37
System Clock Configurations................................................................................................. 37
Internal RC Oscillator – HIRC................................................................................................ 38
Internal 32kHz Oscillator – LIRC............................................................................................ 38
Supplementary Oscillator....................................................................................................... 38
Operating Modes and System Clocks.......................................................... 38
System Clocks....................................................................................................................... 38
System Operation Modes....................................................................................................... 39
Control Register..................................................................................................................... 40
Operating Mode Switching..................................................................................................... 42
NORMAL Mode to SLOW Mode Switching............................................................................ 43
SLOW Mode to NORMAL Mode Switching ........................................................................... 44
Entering the SLEEP0 Mode................................................................................................... 44
Entering the SLEEP1 Mode................................................................................................... 45
Entering the IDLE0 Mode....................................................................................................... 45
Entering the IDLE1 Mode....................................................................................................... 45
Standby Current Considerations............................................................................................ 46
Wake-up................................................................................................................................. 46
Watchdog Timer.............................................................................................. 47
Watchdog Timer Clock Source............................................................................................... 47
Watchdog Timer Control Register.......................................................................................... 47
Watchdog Timer Operation.................................................................................................... 48
Reset and Initialisation................................................................................... 49
Reset Functions..................................................................................................................... 50
Reset Initial Conditions.......................................................................................................... 53
Input/Output Ports.......................................................................................... 56
Pull-high Resistors................................................................................................................. 57
Port A Wake-up...................................................................................................................... 58
I/O Port Control Registers...................................................................................................... 58
Pin-shared Functions............................................................................................................. 59
I/O Pin Structures................................................................................................................... 64
System Clock output pin CLO................................................................................................ 65
Programming Considerations................................................................................................. 65
Rev. 1.10
3
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Timer Modules – TM....................................................................................... 66
Introduction............................................................................................................................ 66
TM Operation......................................................................................................................... 66
TM Clock Source.................................................................................................................... 66
TM Interrupts.......................................................................................................................... 67
TM External Pins.................................................................................................................... 67
TM Input/Output Pin Control Register.................................................................................... 67
Programming Considerations................................................................................................. 68
Standard Type TM – STM............................................................................... 69
Standard TM Operation.......................................................................................................... 69
Standard Type TM Register Description................................................................................ 70
Standard Type TM Operating Modes..................................................................................... 74
Compare Output Mode........................................................................................................... 74
Timer/Counter Mode.............................................................................................................. 77
PWM Output Mode................................................................................................................. 77
Single Pulse Mode................................................................................................................. 80
Capture Input Mode............................................................................................................... 82
Periodic Type TM – PTM................................................................................. 83
Periodic TM Operation........................................................................................................... 83
Periodic Type TM Register Description.................................................................................. 84
Periodic Type TM Operating Modes....................................................................................... 88
Compare Match Output Mode................................................................................................ 88
Timer/Counter Mode.............................................................................................................. 91
PWM Output Mode................................................................................................................. 91
Single Pulse Output Mode..................................................................................................... 93
Capture Input Mode............................................................................................................... 95
Analog to Digital Converter........................................................................... 97
A/D Overview......................................................................................................................... 97
A/D Converter Register Description....................................................................................... 98
A/D Converter Data Registers – SADOL, SADOH................................................................. 98
A/D Converter Control Registers – SADC0, SADC1, SADC2, PASR, PBSR........................ 99
A/D Operation...................................................................................................................... 102
A/D Converter Input Signal.................................................................................................. 103
Conversion Rate and Timing Diagram................................................................................. 104
Summary of A/D Conversion Steps...................................................................................... 105
Programming Considerations............................................................................................... 106
A/D Transfer Function.......................................................................................................... 106
A/D Programming Examples................................................................................................ 107
Rev. 1.10
4
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Interrupts....................................................................................................... 109
Interrupt Registers................................................................................................................ 109
Interrupt Operation................................................................................................................115
External Interrupt...................................................................................................................117
Multi-function Interrupt..........................................................................................................118
A/D Converter Interrupt.........................................................................................................118
Time Base Interrupts.............................................................................................................118
EEPROM Interrupt............................................................................................................... 120
TM Interrupts........................................................................................................................ 120
Interrupt Wake-up Function.................................................................................................. 120
Programming Considerations............................................................................................... 121
SCOM Function for LCD............................................................................... 122
LCD operation...................................................................................................................... 122
LCD Bias Current Control.................................................................................................... 123
Application Circuits...................................................................................... 124
Instruction Set............................................................................................... 125
Introduction.......................................................................................................................... 125
Instruction Timing................................................................................................................. 125
Moving and Transferring Data.............................................................................................. 125
Arithmetic Operations........................................................................................................... 125
Logical and Rotate Operation.............................................................................................. 126
Branches and Control Transfer............................................................................................ 126
Bit Operations...................................................................................................................... 126
Table Read Operations........................................................................................................ 126
Other Operations.................................................................................................................. 126
Instruction Set Summary............................................................................. 127
Table Conventions................................................................................................................ 127
Instruction Definition.................................................................................... 129
Package Information.................................................................................... 138
8-pin SOP (150mil) Outline Dimensions.............................................................................. 139
10-pin MSOP Outline Dimensions....................................................................................... 140
16-pin NSOP (150mil) Outline Dimensions.......................................................................... 141
20-pin DIP (300mil) Outline Dimensions.............................................................................. 142
20-pin SOP (300mil) Outline Dimensions............................................................................ 144
20-pin SSOP (150mil) Outline Dimensions.......................................................................... 145
Rev. 1.10
5
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Note that 8-pin MCU package types are not marketed in the following
countries: USA, UK, Germany, The Netherlands, France and Italy.
Features
CPU Features
• Operating Voltage
♦♦
fSYS = 8MHz: 2.2V~5.5V
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
• Power down and wake-up functions to reduce power consumption
• Two Oscillators
♦♦
Internal RC -- HIRC
♦♦
Internal 32kHz -- LIRC
• Fully intergrated internal 8MHz oscillator requires no external components
• Multi-mode operation: NORMAL, SLOW, IDLE and SLEEP
• All instructions executed in one or two instruction cycles
• Table read instructions
• 63 powerful instructions
• Up to 4-level subroutine nesting
• Bit manipulation instruction
Peripheral Features
• Flash Program Memory: 1K×14/2K×15
• RAM Data Memory: 64×8/96×8
• EEPROM Memory: 32×8
• Watchdog Timer function
• Up to 18 bidirectional I/O lines
• Software controlled 4-SCOM lines LCD driver with 1/2 bias (only available for HT66F004)
• Multiple pin-shared external interrupts
• Multiple Timer Modules for time measure, compare match output, capture input, PWM output,
single pulse output functions
• Dual Time-Base functions for generation of fixed time interrupt signals
• Multi-channel 12-bit resolution A/D converter
• Low voltage reset function
• Wide range of available package types
Rev. 1.10
6
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
General Description
The devices are Flash Memory type 8-bit high performance RISC architecture microcontrollers.
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 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 function. Multiple and extremely
flexible Timer Modules provide timing, pulse generation, capture input, compare match output,
single pulse output and PWM generation functions. Protective features such as an internal Watchdog
Timer and Low Voltage Reset coupled with excellent noise immunity and ESD protection ensure
that reliable operation is maintained in hostile electrical environments.
A full choice of HIRC and LIRC oscillator functions are provided including a fully integrated
system oscillator which requires no external components for its implementation.
The inclusion of flexible I/O programming features, Time-Base functions along with many other
features ensure that the devices will find 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 feature distinguishing them are Program Memory
and Data memory capacity. The following table summarises the main features of each device.
Part No.
Program
Data
Data
A/D
I/O
Memory Memory EEPROM
Converter
Timer
Module
Time
R-Type
Stack
Base
LCD
Package
HT66F002
1K×14
64×8
32×8
8
12-bit×4
10-bit STM×1
2
2
—
8SOP/
10MSOP
HT66F003
1K×14
64×8
32×8
14
12-bit×4
10-bit STM×1
10-bit PTM×1
2
2
—
16NSOP
HT66F004
2K×15
96×8
32×8
18
12-bit×8
10-bit PTM×2
2
4
Rev. 1.10
7
16NSOP
4SCOM 20DIP/SOP
20SSOP/
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Block Diagram
EEPROM
Data
Memory
Watchdog
Timer
Low Voltage
Reset
Flash/EEPROM
Programming Circuitry
Flash
Program
Memory
8-bit
RISC
MCU
Core
Time
Bases
Reset
Circuit
Interrupt
Controller
Internal RC
Oscillators
I/O
RAM Data
Memory
Timer
Modules
12-bit A/D
Converter
Note: LCD function is only available for HT66F004.
Pin Assignment
VDD/AVDD
PA6/�TP0I/[�TCK0]
1
8
V��/AV��
�
7
PA0/[�TP0]/[�TP0I]/AN0/ICPDA
PA5/INT/�TP0B/AN3
3
6
PA1/[�TP0B]/AN1/VREF
PA7/[INT]/�TCK0/RE�/ICPCK
�
5
PA�/[INT]/�TP0/AN�/VREFO
HT66F002
8 SOP-A
VDD/AVDD
PA6/�TP0I/[�TCK0]
1
10
�
�
PA0/[�TP0]/[�TP0I]/AN0/ICPDA
PA5/INT/�TP0B/AN3
3
8
PA1/[�TP0B]/AN1/VREF
PA7/[INT]/�TCK0/RE�/ICPCK
�
7
PA�/[INT]/�TP0/AN�/VREFO
PA�
5
6
PA3/[INT]
V��/AV��
HT66F002
10 MSOP-A
VDD/AVDD
PA6/�TP0I/[�TCK0]
1
16
V��/AV��
�
15
PA0/[�TP0]/[�TP0I]/AN0/ICPDA
PA5/INT/�TP0B/AN3
3
1�
PA1/[�TP0B]/AN1/VREF
PA7/[INT]/�TCK0/RE�/ICPCK
PA�
NC
�
13
PA�/[INT]/�TP0/AN�/VREFO
5
1�
PA3/[INT]
6
11
NC
7
10
NC
NC
OCD�CK
8
�
OCD�DA
HT66V002
16 NSOP-A
Rev. 1.10
8
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
PB�/PTP1B
1
16
PB1/[PTCK1]/�TP0B
�
15
PB3/[PTP1]
PB�/[PTP1B]
PB0/[PTP1I]/VREFO
3
1�
PB5/PTP1
PA3/INT/�TCK0/AN3
�
13
PA�/[INT]/PTCK1/�TP0
PA�/[INT]/[�TCK0]/AN�/OCD�CK/ICPCK
5
1�
PA1/AN1/VREF
6
11
PA5/[INT]/PTP1I
PA6/[PTCK1]/�TP0I/[�TP0]
PA0/[�TP0I]/AN0/OCD�DA/ICPDA
7
10
PA7/[PTCK1]/[�TP0B]/RE�
V��/AV��
8
�
VDD/AVDD
HT66F003/HT66V003
16 NSOP-A
V��/AV��
1
16
VDD/AVDD
PC0/�COM0
�
15
PB0/INT0/AN0
PC1/�COM1
3
1�
PB1/INT1/AN1
PC�/RE�
PA0/PTP0/ICPDA/OCD�DA
�
13
PB�/PTCK0/AN�
5
1�
PA�/PTCK1/AN3
PA1/PTP0I
PA�/ICPCK/OCD�CK
6
11
PA5/AN�/VREF
7
10
PA6/AN5/VREFO
PA3/PTP1I
8
�
PA7/PTP1/AN6
HT66F004/HT66V004
16 NSOP-A
V��/AV��
1
�0
VDD/AVDD
PC0/�COM0
�
1�
PB0/INT0/AN0
PC1/�COM1
3
18
PB1/INT1/AN1
PC�/RE�
PA0/PTP0/ICPDA/OCD�DA
�
17
PB�/PTCK0/AN�
5
16
PA�/PTCK1/AN3
PA1/PTP0I
6
15
PA5/AN�/VREF
PA�/ICPCK/OCD�CK
7
1�
PA6/AN5/VREFO
PA3/PTP1I
8
13
PA7/PTP1/AN6
PB6/PTP1B
�
1�
PB3/�COM3/AN7
PB5/PTP0B
10
11
PB�/CLO/�COM�
HT66F004/HT66V004
20 SOP-A/SSOP-A/DIP-A
Note: 1. Bracketed pin names indicate non-default pinout remapping locations.
2. AVDD&VDD means the VDD and AVDD are the double bonding. VSS&AVSS means the VSS and
AVSS are the double bonding.
3. The OCDSDA and OCDSCK pins are the OCDS dedicated pins
Rev. 1.10
9
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Pin Description
With the exception of the power pins and some relevant transformer control pins, all pins on these
devices can be referenced by their Port name, e.g. PA0, PA1 etc, which refer to the digital I/O
function of the pins. However these Port pins are also shared with other function such as the Analog
to Digital Converter, Timer Module pins etc. The function of each pin is listed in the following table,
however the details behind how each pin is configured is contained in other sections of the datasheet.
HT66F002
Pin Name
PA0/[STP0]/
[STP0I]/AN0/
ICPDA
PA1/[STP0B]/
AN1/VREF
PA2/[INT]/
STP0/AN2/
VREFO
Function
OPT
I/T
O/T
Description
PA0
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
STP0
PASR
—
CMOS
TM0 (STM) output
STP0I
PASR
IFS0
ST
—
TM0 (STM) input
ADC input channel 0
AN0
PASR
AN
—
ICPDA
—
ST
CMOS
ICP Data Line
PA1
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
STP0B
PASR
—
CMOS
TM0 (STM) inverting output
AN1
PASR
AN
—
ADC input channel 1
VREF
PASR
AN
—
ADC VREF Input
PA2
PAWU
PAPU
PASR
ST
CMOS
INT
PASR
IFS0
ST
—
STP0
PASR
—
CMOS
AN2
PASR
AN
—
ADC input channel 2
VREFO
PASR
—
AN
ADC reference voltage output
PA3
PAWU
PAPU
PASR
ST
CMOS
INT
PASR
IFS0
ST
—
PA4
PAWU
PAPU
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PA5
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
INT
PASR
IFS0
ST
—
STP0B
PASR
—
CMOS
AN3
PASR
AN
—
PA6
PAWU
PAPU
ST
CMOS
STP0I
IFS0
ST
—
TM0 (STM) input
STCK0
IFS0
ST
—
TM0 (STM) clock input
PA3/[INT]
PA4
PA5/INT/
STP0B/AN3
PA6/STP0I/
[STCK0]
Rev. 1.10
10
General purpose I/O. Register enabled pull-up and
wake-up
External interrupt input
TM0 (STM) output
General purpose I/O. Register enabled pull-up and
wake-up
External interrupt input
External interrupt input
TM0 (STM) inverting output
ADC input channel 3
General purpose I/O. Register enabled pull-up and
wake-up
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Pin Name
PA7/[INT]/
STCK0/RES/
ICPCK
Function
OPT
PA7
PAWU
PAPU
I/T
O/T
Description
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
INT
IFS0
ST
—
External interrupt input
STCK0
IFS0
ST
—
TM0 (STM) clock input
External reset input
RES
RSTC
ST
—
ICPCK
—
ST
CMOS
VDD
VDD
—
PWR
—
Digital positive power supply
AVDD
AVDD
—
PWR
—
Analog positive power supply
VSS
VSS
—
PWR
—
Digital negative power supply
AVSS
AVSS
—
PWR
—
Analog negative power supply
OCDSCK
OCDSCK
—
ST
—
On Chip Debug System Clock Line (OCDS EV only)
OCDSDA
OCDSDA
—
ST
CMOS
On Chip Debug System Data Line (OCDS EV only)
Function
OPT
I/T
O/T
Description
PA0
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
STP0I
PASR
IFS0
ST
—
TM0 (STM) input
AN0
PASR
AN
—
ADC input channel 0
OCDSDA
—
ST
CMOS
On Chip Debug System Data Line (OCDS EV only)
ICPDA
—
ST
CMOS
ICP Data Line
PA1
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
ICP Clock Line
HT66F003
Pin Name
PA0/[STP0I]/
AN0
/OCDSDA/
ICPDA
PA1/AN1/VREF
PA2/[INT]/
[STCK0]/AN2
/OCDSCK/
ICPCK
PA3/INT/
STCK0/AN3
PA4/[INT]/
PTCK1/STP0
Rev. 1.10
AN1
PASR
AN
—
ADC input channel 1
VREF
PASR
AN
—
ADC VREF Input
PA2
PAWU
PAPU
PASR
ST
CMOS
INT
PASR
IFS0
ST
—
External interrupt input
General purpose I/O. Register enabled pull-up and
wake-up
STCK0
IFS0
ST
—
TM0 (STM) clock input
AN2
PASR
AN
—
ADC input channel 2
OCDSCK
—
ST
—
On Chip Debug System Clock Line (OCDS EV
only)
ICPCK
—
ST
CMOS
ICP Clock Line
PA3
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
INT
PASR
IFS0
ST
—
External interrupt input
STCK0
IFS0
ST
—
TM0 (STM) clock input
AN3
PASR
AN
—
ADC input channel 3
PA4
PAWU
PAPU
PASR
ST
CMOS
INT
PASR
IFS0
ST
—
External interrupt input
PTCK1
PASR
IFS0
ST
—
TM1 (PTM) clock input
STP0
PASR
—
CMOS
11
General purpose I/O. Register enabled pull-up and
wake-up
TM0 (STM) output
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Pin Name
PA5/[INT]/
PTP1I
PA6/[PTCK1]/
STP0I/[STP0]
PA7/[PTCK1]/
[STP0B]/RES
PB0/[PTP1I]/
VREFO
PB1/[PTCK1]/
STP0B
PB2/PTP1B
PB3/[PTP1]
PB4/[PTP1B]
PB5/PTP1
Function
OPT
PA5
PAWU
PAPU
INT
I/T
O/T
Description
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PASR
IFS0
ST
—
External interrupt input
PTP1I
IFS0
ST
—
TM1 (PTM) input
PA6
PAWU
PAPU
PASR
ST
CMOS
PTCK1
PASR
IFS0
ST
—
TM1 (PTM) clock input
STP0I
PASR
IFS0
ST
—
TM0 (STM) input
STP0
PASR
—
CMOS
TM0 (STM) output
PA7
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PTCK1
PASR
IFS0
ST
—
STP0B
PASR
ST
CMOS
RES
RSTC
ST
—
PB0
PBPU
PBSR
ST
CMOS
PTP1I
PBSR
IFS0
ST
—
TM1 (PTM) input
VREFO
PBSR
—
AN
ADC reference voltage output
PB1
PBPU
PBSR
ST
CMOS
PTCK1
PBSR
IFS0
ST
—
STP0B
PBSR
ST
CMOS
TM0 (STM) inverting output
PB2
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
PTP1B
PBSR
ST
CMOS
TM1 (PTM) inverting output
PB3
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
PTP1
PBSR
—
CMOS
TM1 (PTM) output
PB4
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
PTP1B
PBSR
—
CMOS
TM1 (PTM) inverting output
PB5
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
TM1 (PTM) output
General purpose I/O. Register enabled pull-up and
wake-up
TM1 (PTM) clock input
TM0 (STM) inverting output
External reset input
General purpose I/O. Register enabled pull-up
General purpose I/O. Register enabled pull-up
TM1 (PTM) clock input
PTP1
PBSR
—
CMOS
VDD
VDD
—
PWR
—
Digital positive power supply
AVDD
AVDD
—
PWR
—
Analog positive power supply
VSS
VSS
—
PWR
—
Digital negative power supply
AVSS
AVSS
—
PWR
—
Analog negative power supply
Rev. 1.10
12
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
HT66F004
Pin Name
PA0/PTP0/
OCDSDA/
ICPDA
PA1/PTP0I
PA2/ICPCK/
OCDSCK
PA3/PTP1I
PA4/PTCK1/
AN3
PA5/AN4/VREF
PA6/AN5/
VREFO
PA7/PTP1/AN6
PB0/INT0/AN0
PB1/INT1/AN1
PB2/PTCK0/
AN2
Rev. 1.10
Function
OPT
I/T
O/T
Description
PA0
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PTP0
PASR
—
CMOS
PT0 output
OCDSDA
—
ST
CMOS
On Chip Debug System Data Line (OCDS EV only)
ICPDA
—
ST
CMOS
ICP Data Line
PA1
PAWU
PAPU
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PTP0I
—
ST
—
PA2
PAWU
PAPU
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
ICPCK
—
ST
CMOS
ICP Clock Line
OCDSCK
—
ST
—
PA3
PAWU
PAPU
ST
CMOS
PTP1I
—
ST
—
PA4
PAWU
PAPU
PASR
ST
CMOS
PTCK1
PASR
ST
—
PTM1 clock input
AN3
PASR
AN
—
ADC input channel 3
PA5
PAWU
PAPU
PASR
ST
CMOS
PTM0 input
On Chip Debug System Clock Line (OCDS EV
only)
General purpose I/O. Register enabled pull-up and
wake-up
PTM1 input
General purpose I/O. Register enabled pull-up and
wake-up
General purpose I/O. Register enabled pull-up and
wake-up
AN4
PASR
AN
—
ADC input channel 4
VREF
PASR
AN
—
ADC VREF Input
PA6
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
AN5
PASR
AN
—
ADC input channel 5
VREFO
PASR
—
AN
ADC reference voltage output
PA7
PAWU
PAPU
PASR
ST
CMOS
General purpose I/O. Register enabled pull-up and
wake-up
PTP1
PASR
—
CMOS
PTM1 output
AN6
PASR
AN
—
PB0
PBPU
PBSR
ST
CMOS
INT0
PBSR
ST
—
External interrupt input
AN0
PBSR
AN
—
ADC input channel 0
PB1
PBPU
PBSR
ST
CMOS
INT1
PBSR
ST
—
External interrupt input
AN1
PBSR
AN
—
ADC input channel 1
PB2
PBPU
PBSR
ST
CMOS
PTCK0
PBSR
ST
—
PTM0 clock input
AN2
PBSR
AN
—
ADC input channel 2
13
ADC input channel 6
General purpose I/O. Register enabled pull-up
General purpose I/O. Register enabled pull-up
General purpose I/O. Register enabled pull-up
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Pin Name
PB3/SCOM3/
AN7
PB4/CLO/
SCOM2
PB5/PTP0B
PB6/PTP1B
PC0/SCOM0
PC1/SCOM1
PC2/RES
Function
OPT
I/T
O/T
PB3
PBPU
PBSR
Description
ST
CMOS
General purpose I/O. Register enabled pull-up
SCOM3
SCOMC
—
SCOM
LCD driver output for LCD panel common
AN7
PBSR
AN
—
PB4
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
ADC input channel 7
CLO
PBSR
—
CMOS
System clock output
SCOM2
SCOMC
—
SCOM
LCD driver output for LCD panel common
PB5
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
PTP0B
PBSR
ST
CMOS
PTM0 inverting output
PB6
PBPU
PBSR
ST
CMOS
General purpose I/O. Register enabled pull-up
PTP1B
PBSR
ST
CMOS
PTM1 inverting output
PC0
PCPU
ST
CMOS
General purpose I/O. Register enabled pull-up
SCOM0
SCOMC
—
SCOM
LCD driver output for LCD panel common
PC1
PCPU
ST
CMOS
General purpose I/O. Register enabled pull-up
SCOM1
SCOMC
—
SCOM
LCD driver output for LCD panel common
PC1
PCPU
RSTC
ST
CMOS
General purpose I/O. Register enabled pull-up
RES
RSTC
ST
—
External reset input
VDD
VDD
—
PWR
—
Digital positive power supply
AVDD
AVDD
—
PWR
—
Analog positive power supply
VSS
VSS
—
PWR
—
Digital negative power supply
AVSS
AVSS
—
PWR
—
Analog negative power supply
Legend: I/T: Input type;
O/T: Output type; PWR: Power;
OP: Optional by register option SCOM: Software controlled LCD COM
ST: Schmitt Trigger input;
CMOS: CMOS output;
AN: Analog pin
*: 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.
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
IOL Total...................................................................................................................................... 80mA
IOH 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 specification is not implied and prolonged exposure to
extreme conditions may affect devices reliability.
Rev. 1.10
14
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
D.C. Characteristics
Ta = 25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
VDD
Operating Voltage (HIRC)
—
fSYS=8MHz
2.2
—
5.5
V
IDD1
Operating Current,
Normal Mode, fSYS=fH (HIRC)
3V
No load, fH=8MHz, ADC off,
WDT enable, LVR enable
—
1.0
2.0
mA
—
2.0
3.0
mA
Operating Current,
Slow Mode, fSYS=fL=LIRC
3V
No load, fSYS=LIRC, ADC off,
WDT enable , LVR enable
—
20
30
μA
—
30
60
μA
No load, fSYS=fH/2, ADC off,
WDT enable, LVR enable
—
1.0
1.5
mA
—
1.5
2.0
mA
No load, fSYS=fH/4, ADC off,
WDT enable, LVR enable
—
0.9
1.3
mA
—
1.3
1.8
mA
No load, fSYS=fH/8, ADC off,
WDT enable, LVR enable
—
0.8
1.1
mA
—
1.1
1.6
mA
No load, fSYS=fH/16, ADC off,
WDT enable, LVR enable
—
0.7
1.0
mA
—
1.0
1.4
mA
No load, fSYS=fH/32, ADC off,
WDT enable, LVR enable
—
0.6
0.9
mA
—
0.9
1.2
mA
No load, fSYS=fH/64, ADC off,
WDT enable, LVR enable
—
0.5
0.8
mA
—
0.8
1.1
mA
No load, ADC off, WDT enable,
LVR disable
—
1.3
3.0
μA
—
5.0
10
μA
No load, ADC off, WDT enable,
fSYS=8MHz on
—
0.8
1.6
mA
—
1.0
2.0
mA
No load, ADC off, WDT disable,
LVR disable
—
0.1
1.0
μA
—
0.3
2.0
μA
—
1.3
5.0
μA
5V
No load, ADC off, WDT enable,
LVR disable
—
2.2
10
μA
IDD2
5V
5V
3V
5V
3V
5V
3V
IDD3
Operating Current,
Normal Mode, fH=8MHz (HIRC)
5V
3V
5V
3V
5V
3V
5V
3V
IIDLE0
IDLE0 Mode Standby Current
(LIRC on)
IIDLE1
IDLE1 Mode Standby Current
(HIRC)
3V
ISLEEP0
SLEEP0 Mode Standby Current
(LIRC off)
3V
ISLEEP1
SLEEP1 Mode Standby Current
(LIRC on)
VIL1
Input Low Voltage for I/O Ports or
Input Pins except RES pin
5V
—
0
—
1.5
V
—
—
0
—
0.2VDD
V
VIH1
Input High Voltage for I/O Ports or
Input Pins except RES pin
5V
—
3.5
—
5.0
V
—
—
0.8VDD
—
VDD
V
VIL2
Input Low Voltage (RES)
—
—
0
—
0.4VDD
V
VIH2
Input High Voltage (RES)
—
—
0.9VDD
—
VDD
V
—
mA
IOL
IOH
I/O Port Sink Current
I/O Port, Source Current
RPH
Pull-high Resistance for I/O Ports
IOCDS
Operating Current, Normal Mode,
fSYS=fH (HIRC) (for OCDS EV
testing, connect to an e-Link)
Rev. 1.10
5V
5V
5V
3V
3V
VOL=0.1VDD
18
36
5V
VOL=0.1VDD
40
80
—
mA
3V
VOH=0.9VDD
-3
-6
—
mA
5V
VOH=0.9VDD
-7
-14
—
mA
3V
—
20
60
100
kΩ
5V
—
10
30
50
kΩ
—
1.4
2.0
mA
3V
No load, fH=8MHz, ADC off,
WDT enable
15
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
A.C. Characteristics
Ta = 25°C
Symbol
fCPU
fHIRC
Parameter
Operating Clock
System Clock (HIRC)
Test Conditions
VDD
Condition
2.2~5.5V
—
Min.
Typ.
Max.
Unit
MHz
DC
—
8
3V/5V
Ta = 25°C
-2%
8
+2%
MHz
3V/5V
Ta = 0°C to 70°C
-5%
8
+5%
MHz
2.2V~5.5V Ta = 0°C to 70°C
-8%
8
+8%
MHz
2.2V~5.5V Ta = -40°C to 85°C
-12%
8
+12% MHz
fLIRC
System Clock (LIRC)
8
32
50
kHz
tTIMER
xTCKn, xTPnI Input Pulse Width
—
—
0.3
—
—
μs
tRES
External Reset Low Pulse Width
—
—
10
—
—
μs
tINT
Interrupt Pulse Width
—
—
0.3
—
—
μs
tEERD
EEPROM Read Time
—
—
—
2
4
tSYS
tEEWR
EEPROM Write Time
—
ms
tSST
System Start-up Timer Period
(Wake-up from HALT, fSYS off at
HALT state)
—
System Reset Delay Time
(Power On Reset, LVR reset, WDT
S/W reset(WDTC)
—
System Reset Delay Time
(RES reset, WDT normal reset)
—
tRSTD
2.2V~5.5V Ta = -40°C to 85°C
—
2
5
fSYS =HIRC
—
16
—
—
fSYS =LIRC
2
—
—
—
25
50
100
ms
—
8.3
16.7
33.3
ms
tSYS
Note: 1. tSYS= 1/fSYS
2. 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.
Rev. 1.10
16
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
ADC Electrical Characteristics
Ta = 25°C
Symbol
AVDD
Parameter
A/D Converter Operating Voltage
VADI
A/D Converter Input Voltage
VREF
A/D Converter Reference Voltage
DNL
Differential Non-linearity
Test Conditions
VDD
Conditions
—
—
2.7V
Unit
2.7
—
5.5
V
V
0
—
—
2
—
AVDD
V
VREF=AVDD=VDD
tADCK =0.5μs
-3
—
+3
LSB
VREF=AVDD=VDD
tADCK =0.5μs
-4
—
+4
LSB
3V
5V
Max.
—
5V
3V
Typ.
AVDD /
VREF
—
2.7V
Min.
INL
Integral Non-linearity
3V
IADC
Additional Power Consumption if
A/D Converter is used
3V
No load (tADCK =0.5μs )
—
1.0
2.0
mA
5V
No load (tADCK =0.5μs )
—
1.5
3.0
mA
0.5
—
10
μs
16
—
20
tADCK
5V
tADCK
A/D Converter Clock Period
2.7~
5.5V
tADC
A/D Conversion Time (Include
Sample and Hold Time)
2.7~
12-bit ADC
5.5V
tADS
A/D Converter Sampling Time
2.7~
5.5V
—
—
4
—
tADCK
tON2ST
A/D Converter On-to-Start Time
2.7~
5.5V
—
4
—
—
μs
Rev. 1.10
—
17
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
LVR Electrical Characteristics
Symbol
Test Conditions
Parameter
VDD
Min.
Conditions
Typ.
Max.
Unit
VDD
Operating Voltage
—
1.9
—
5.5
V
VLVR
Low Voltage Reset Voltage
—
LVR Enable, 2.1V option
-5%
2.10
+5%
V
VBG
Reference Output with Buffer
—
TJ = +25°C @3.15V
-5%
1.04
+5%
V
tLVR
Low Voltage Width to Reset
—
160
320
640
μs
Min.
Typ.
Max.
Unit
ISEL[1:0]=00
17.5
25.0
32.5
μA
ISEL[1:0]=01
35
50
65
μA
ISEL[1:0]=10
70
100
130
μA
ISEL[1:0]=11
140
200
260
μA
0.475
0.5
0.525
VDD
—
—
LCD Electrical Characteristics
Symbol
IBIAS
VSCOM
Test Conditions
Parameter
VDD
VDD/2 Bias Current for LCD
Conditions
5V
VDD/2 Voltage for LCD COM Port 2.2~5.5V No load
Power on Reset Electrical Characteristics
Ta = 25°C
Symbol
Test Conditions
Parameter
VDD
Conditions
Min.
Typ. Max. Unit
VPOR
VDD Start Voltage to Ensure Power-on Reset
—
—
—
—
100
mV
RRVDD
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
Rev. 1.10
18
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
System Architecture
A key factor in the high-performance features of the Holtek range of microcontrollers is attributed
to their internal system architecture. The device takes advantage of the usual features found within
RISC microcontrollers providing increased speed of operation and Periodic 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 cycle, with the exception of branch
or call instructions. 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 simplified 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 these devices 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.
   
 
  
System Clock and Pipelining
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 first 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. 1.10
19
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
  
    
 Instruction Fetching
Program Counter
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 nonconsecutive 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.
Device
Program Counter
Program Counter
High byte
PCL Register
HT66F002/HT66F003
PC9~PC8
PCL7~PCL0
HT66F004
PC10~PC8
PCL7~PCL0
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. 1.10
20
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Stack
This is a special part of the memory which is used to save the contents of the Program Counter
only. The stack is 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 flag 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 overflow 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 overflow. Precautions should be taken to avoid such
cases which might cause unpredictable program branching. If the stack is overflow, the first Program
Counter save in the stack will be lost.
P ro g ra m
T o p o f S ta c k
S ta c k L e v e l 1
S ta c k
P o in te r
B o tto m
o f S ta c k
C o u n te r
P ro g ra m
M e m o ry
S ta c k L e v e l N
Device
Stack Levels
HT66F002/HT66F003
2
HT66F004
4
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 specified register. As these ALU calculation or operations may
result in carry, borrow or other status changes, the status register will be correspondingly updated to
reflect these changes. The ALU supports the following functions:
• Arithmetic operations: ADD, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA
• Logic operations: AND, OR, XOR, ANDM, ORM, XORM, CPL, CPLA
• Rotation: RRA, RR, RRCA, RRC, RLA, RL, RLCA, RLC
• Increment and Decrement: INCA, INC, DECA, DEC
• Branch decision: JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA, CALL, RET, RETI
Rev. 1.10
21
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Flash Program Memory
The Program Memory is the location where the user code or program is stored. For these devices the
Program Memory are Flash type, which means it can be programmed and re-programmed a large
number of times, allowing the user the convenience of code modification on the same device. By
using the appropriate programming tools, these Flash devices offer users the flexibility to conveniently
debug and develop their applications while also offering a means of field programming and updating.
Structure
The Program Memory has a capacity of 1K×14 or 2K ×15 bits. The Program Memory is addressed by
the Program Counter and also contains data, table information and interrupt entries. Table data, which
can be setup in any location within the Program Memory, is addressed by a separate table pointer register.
HT66F00� HT66F003 HT66F00�
Reset
Reset
Reset
000H
00�H
Inte��u�t
Vecto�
018H
Inte��u�t
Vecto�
Inte��u�t
Vecto�
1� �its
15 �its
01CH
1� �its
3FFH
7FFH
Program Memory Structure
Special Vectors
Within the Program Memory, certain locations are reserved for the reset and interrupts. The location
000H is reserved for use by these devices reset for program initialisation. After a device reset is
initiated, the program will jump to this location and begin execution.
Look-up Table
Any location within the Program Memory can be defined as a look-up table where programmers can
store fixed data. To use the look-up table, the table pointer must first be setup by placing the address
of the look up data to be retrieved in the table pointer register, TBLP. This register defines the total
address of the look-up table.
After setting up the table pointer, the table data can be retrieved from the Program Memory using
the “TABRD[m]” or “TABRDL[m]” instructions, respectively. When the instruction is executed,
the lower order table byte from the Program Memory will be transferred to the user defined
Data Memory register [m] as specified in the instruction. The higher order table data byte from
the Program Memory will be transferred to the TBLH special register. Any unused bits in this
transferred higher order byte will be read as “0”.
The accompanying diagram illustrates the addressing data flow of the look-up table.
   
Rev. 1.10
22
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Table Program Example
The following example shows how the table pointer and table data is defined and retrieved from the
microcontroller. This example uses raw table data located in the Program Memory which is stored
there using the ORG statement. The value at this ORG statement is “300H” which refers to the start
address of the last page within the 1K words Program Memory of the device. The table pointer is
setup here to have an initial value of “06H”. This will ensure that the first data read from the data
table will be at the Program Memory address “306H” or 6 locations after the start of the last page.
Note that the value for the table pointer is referenced to the first address of the specified page if the
“TABRD [m]” instruction is being used. The high byte of the table data which in this case is equal
to zero will be transferred to the TBLH register automatically when the “TABRD [m]” instruction is
executed.
Because the TBLH register is a read-only register and cannot be restored, care should be taken
to ensure its protection if both the main routine and Interrupt Service Routine use table read
instructions. If using the table read instructions, the Interrupt Service Routines may change the
value of the TBLH and subsequently cause errors if used again by the main routine. As a rule it is
recommended that simultaneous use of the table read instructions should be avoided. However, in
situations where simultaneous use cannot be avoided, the interrupts should be disabled prior to the
execution of any main routine table-read instructions. Note that all table related instructions require
two instruction cycles to complete their operation.
Table Read Program Example
tempreg1 db ? ; temporary register #1
tempreg2 db ? ; temporary register #2
:
:
mov a,06h ; initialise low table pointer - note that this address is referenced
mov tblp,a ; to the last page or present page
:
:
tabrd tempreg1 ; transfers value in table referenced by table pointer data at program
; memory address “306H” transferred to tempreg1 and TBLH
dec tblp ; reduce value of table pointer by one
tabrd tempreg2 ; transfers value in table referenced by table pointer data at program
; memory address “305H” transferred to tempreg2 and TBLH in this
; example the data “1AH” is transferred to tempreg1 and data “0FH” to
; register tempreg2
:
:
org 300h; sets initial address of program memory
dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
:
:
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
In Circuit Programming
The provision of Flash type Program Memory provides the user with a means of convenient and easy
upgrades and modifications to their programs on the same device. As an additional convenience,
Holtek has provided a means of programming the microcontroller in-circuit using a 4-pin interface.
This provides manufacturers with the possibility of manufacturing their circuit boards complete with
a programmed or un-programmed microcontroller, and then programming or upgrading the program
at a later stage. This enables product manufacturers to easily keep their manufactured products
supplied with the latest program releases without removal and re-insertion of the device.
MCU Programming Pins
Holtek Write Pins
ICPDA
PA0
ICPCK
Function
HT66F003/
HT66F004
HT66F002
PA7
Programming Serial Data
PA2
Programming Serial Clock
VDD
VDD
Power Supply
VSS
VSS
Ground
The Program Memory and EEPROM data memory can both be programmed serially in-circuit using
this 4-wire interface. Data is downloaded and uploaded serially on a single pin with an additional
line for the clock. Two additional lines are required for the power supply and ground. The technical
details regarding the in-circuit programming of the device are beyond the scope of this document
and will be supplied in supplementary literature.
W r ite r C o n n e c to r
S ig n a ls
M C U
P r o g r a m m in g
P in s
W r ite r C o n n e c to r
S ig n a ls
M C U P r o g r a m m in g
P in s
W r ite r _ V D D
V D D
W r ite r _ V D D
V D D
IC P D A
P A 0
IC P D A
P A 0
IC P C K
P A 7
IC P C K
P A 2
W r ite r _ V S S
V S S
W r ite r _ V S S
V S S
*
*
*
*
T o o th e r C ir c u it
T o o th e r C ir c u it
HT66F002
HT66F003/HT66F004
Note: * may be resistor or capacitor. The resistance of * must be greater than 1k or the capacitance
of * must be less than 1nF.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
On-Chip Debug Support – OCDS
There is an EV chip which is used to emulate the HT66F00x device series. This EV chip device
also provides an “On-Chip Debug” function to debug the device during the development process.
The EV chip and the actual MCU devices are almost functionally compatible except for the “OnChip Debug” function. Users can use the EV chip device to emulate the real chip device behavior
by connecting the OCDSDA and OCDSCK pins to the Holtek HT-IDE development tools. The
OCDSDA pin is the OCDS Data/Address input/output pin while the OCDSCK pin is the OCDS
clock input pin. When users use the EV chip for debugging, other functions which are shared with
the OCDSDA and OCDSCK pins in the actual MCU device will have no effect in the EV chip.
However, the two OCDS pins which are pin-shared with the ICP programming pins are still used as
the Flash Memory programming pins for ICP. For a more detailed OCDS description, refer to the
corresponding document named “Holtek e-Link for 8-bit MCU OCDS User’s Guide”.
Holtek e-Link Pins
EV Chip Pins
OCDSDA
OCDSDA
On-chip Debug Support Data/Address input/output
Pin Description
OCDSCK
OCDSCK
On-chip Debug Support Clock input
VDD
VDD
Power Supply
GND
VSS
Ground
RAM Data Memory
The Data Memory is a volatile area of 8-bit wide RAM internal memory and is the location where
temporary information is stored.
Structure
Divided into two sections, the first of these is an area of RAM, known as the Special Function Data
Memory. Here are located registers which are necessary for correct operation of the device. Many
of these registers can be read from and written to directly under program control, however, some
remain protected from user manipulation. The second area of Data Memory is known as the General
Purpose Data Memory, which is reserved for general purpose use. All locations within this area are
read and write accessible under program control.
The overall Data Memory is subdivided into two banks. The Special Purpose Data Memory registers
are accessible in all banks, with the exception of the EEC register at address 40H, which is only
accessible in Bank 1. Switching between the different Data Memory banks is achieved by setting the
Bank Pointer to the correct value. The start address of the Data Memory for all devices is the address
00H.
General Purpose Data Memory
There is 64 or 96 bytes of general purpose data memory which are arranged in Bank 0 and Bank1.
All microcontroller programs require an area of read/write memory where temporary data can be
stored and retrieved for use later. It is this area of RAM memory that is known as General Purpose
Data Memory. This area of Data Memory is fully accessible by the user programing for both reading
and writing operations. By using the bit operation instructions individual bits can be set or reset
under program control giving the user a large range of flexibility for bit manipulation in the Data
Memory.
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Special Purpose Data Memory
This area of Data Memory is where registers, necessary for the correct operation of the
microcontroller, are stored. Most of the registers are both readable and writeable but some are
protected and are readable only, the details of which are located under the relevant Special Function
Register section. Note that for locations that are unused, any read instruction to these addresses will
return the value “00H”.
Device
Capacity
Bank 0
Bank 1
HT66F002/HT66F003
64×8
40H~7FH
40H EEC register only
HT66F004
96×8
40H~9FH
40H EEC register only
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
Bank0 & Bank1
IAR0
MP0
IAR1
MP1
BP
ACC
PCL
TBLP
TBLH
Unused
STATUS
SMOD
Unused
INTEG
INTC0
INTC1
Unused
MFI0
Unused
Unused
PA
PAC
PAPU
PAWU
IFS0
WDTC
Unused
TBC
SMOD1
Unused
EEA
EED
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
~
3FH
Bank0 & Bank1
SADOL
SADOH
SADC0
SADC1
SADC2
RSTC
PASR
Unused
STM0C0
STM0C1
STM0DL
STM0DH
STM0AL
STM0AH
Unused
: Unused, read as “00”
HT66F002 Special Purpose Data Memory Structure
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
Bank0 & Bank1
IAR0
MP0
IAR1
MP1
BP
ACC
PCL
TBLP
TBLH
Unused
STATUS
SMOD
Unused
INTEG
INTC0
INTC1
Unused
MFI0
MFI1
Unused
PA
PAC
PAPU
PAWU
IFS0
WDTC
Unused
TBC
SMOD1
Unused
EEA
EED
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
2FH
30H
31H
32H
33H
34H
35H
36H
37H
38H
39H
3AH
~
3FH
Bank0 & Bank1
SADOL
SADOH
SADC0
SADC1
SADC2
RSTC
PASR
PBSR
STM0C0
STM0C1
STM0DL
STM0DH
STM0AL
STM0AH
Unused
PB
PBC
PBPU
PTM1C0
PTM1C1
PTM1DL
PTM1DH
PTM1AL
PTM1AH
PTM1RPL
PTM1RPH
Unused
: Unused, read as “00”
HT66F003 Special Purpose Data Memory Structure
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
Bank0 & Bank1
IAR0
MP0
IAR1
MP1
BP
ACC
PCL
TBLP
TBLH
Unused
STATUS
SMOD
Unused
INTEG
INTC0
INTC1
Unused
MFI0
Unused
Unused
PA
PAC
PAPU
PAWU
Unused
WDTC
Unused
TBC
SMOD1
SCOMC
EEA
EED
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
2FH
30H
31H
32H
33H
34H
35H
36H
37H
38H
39H
3AH
3BH
3CH
3DH
3EH
3FH
Bank0 & Bank1
SADOL
SADOH
SADC0
SADC1
SADC2
RSTC
PASR
PBSR
Unused
PTM0C0
PTM0C1
PTM0DL
PTM0DH
PTM0AL
PTM0AH
PTM0RPL
PTM0RPH
Unused
PTM1C0
PTM1C1
PTM1DL
PTM1DH
PTM1AL
PTM1AH
PTM1RPL
PTM1RPH
PB
PBC
PBPU
PC
PCC
PCPU
: Unused, read as “00”
HT66F004 Special Purpose Data Memory Structure
40H
EEC
General
Purpose
Data
Memory
Unused
7FH
HT66F002/HT66F003 General Purpose Data Memory
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Special Function Register Description
Most of the Special Function Register details will be described in the relevant functional section,
however several registers require a separate description in this section.
Indirect Addressing Registers – IAR0, IAR1
The Indirect Addressing Registers, IAR0 and IAR1, although having their locations in normal RAM
register space, do not actually physically exist as normal registers. The method of indirect addressing
for RAM data manipulation uses these Indirect Addressing Registers and Memory Pointers, in
contrast to direct memory addressing, where the actual memory address is specified. Actions on the
IAR0 and IAR1 registers will result in no actual read or write operation to these registers but rather
to the memory location specified by their corresponding Memory Pointers, MP0 or MP1. Acting as a
pair, IAR0 and MP0 can together access data from Bank 0 while the IAR1 and MP1 register pair can
access data from any bank. As the Indirect Addressing Registers are not physically implemented,
reading the Indirect Addressing Registers indirectly will return a result of “00H” and writing to the
registers indirectly will result in no operation.
Memory Pointers – MP0, MP1
Two Memory Pointers, known as MP0 and MP1 are provided. These Memory Pointers are
physically implemented in the Data Memory and can be manipulated in the same way as normal
registers providing a convenient way with which to address and track data. When any operation to
the relevant Indirect Addressing Registers is carried out, the actual address that the microcontroller
is directed to is the address specified by the related Memory Pointer. MP0, together with Indirect
Addressing Register, IAR0, are used to access data from Bank 0, while MP1 and IAR1 are used to
access data from all banks according to BP register. Direct Addressing can only be used with Bank 0,
all other Banks must be addressed indirectly using MP1 and IAR1.
The following example shows how to clear a section of four Data Memory locations already defined
as locations adres1 to adres4.
Indirect Addressing Program Example
data .section ´data´
adres1 db ?
adres2 db ?
adres3 db ?
adres4 db ?
block db ?
code .section at 0 ´code´
org00h
start:
mov a,04h ; setup size of block
mov block,a
mov a,offset adres1 ; Accumulator loaded with first RAM address
mov mp0,a ; setup memory pointer with first RAM address
loop:
clr IAR0 ; clear the data at address defined by mp0
inc mp0; increment memory pointer
sdz block ; check if last memory location has been cleared
jmp loop
continue:
The important point to note here is that in the example shown above, no reference is made to specific
Data Memory addresses.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Bank Pointer – BP
For this series of devices, the Data Memory is divided into two banks, Bank0 and Bank1. Selecting
the required Data Memory area is achieved using the Bank Pointer. Bit 0 of the Bank Pointer is used
to select Data Memory Banks 0~1.
The Data Memory is initialised to Bank 0 after a reset, except for a WDT time-out reset in the Power
Down Mode, in which case, the Data Memory bank remains unaffected. It should be noted that the
Special Function Data Memory is not affected by the bank selection, which means that the Special
Function Registers can be accessed from within any bank. Directly addressing the Data Memory
will always result in Bank 0 being accessed irrespective of the value of the Bank Pointer. Accessing
data from Bank1 must be implemented using Indirect Addressing.
BP Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
—
DMBP0
R/W
—
—
—
—
—
—
—
R/W
POR
—
—
—
—
—
—
—
0
Bit 7 ~ 1
Unimplemented, read as "0"
Bit 0DMBP0: Select Data Memory Banks
0: Bank 0
1: Bank 1
Accumulator – ACC
The Accumulator is central to the operation of any microcontroller and is closely related with
operations carried out by the ALU. The Accumulator is the place where all intermediate results
from the ALU are stored. Without the Accumulator it would be necessary to write the result of
each calculation or logical operation such as addition, subtraction, shift, etc., to the Data Memory
resulting in higher programming and timing overheads. Data transfer operations usually involve
the temporary storage function of the Accumulator; for example, when transferring data between
one user-defined register and another, it is necessary to do this by passing the data through the
Accumulator as no direct transfer between two registers is permitted.
Program Counter Low Register – PCL
To provide additional program control functions, the low byte of the Program Counter is made
accessible to programmers by locating it within the Special Purpose area of the Data Memory. By
manipulating this register, direct jumps to other program locations are easily implemented. Loading
a value directly into this PCL register will cause a jump to the specified Program Memory location,
however, as the register is only 8-bit wide, only jumps within the current Program Memory page are
permitted. When such operations are used, note that a dummy cycle will be inserted.
Look-up Table Registers – TBLP, TBLH
These two special function registers are used to control operation of the look-up table which is
stored in the Program Memory. TBLP is the table pointer and indicate the location where the table
data is located. Its value must be setup before any table read commands are executed. Its value
can be changed, for example using the “INC” or “DEC” instructions, allowing for easy table data
pointing and reading. TBLH is the location where the high order byte of the table data is stored
after a table read data instruction has been executed. Note that the lower order table data byte is
transferred to a user defined location.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Status Register – STATUS
This 8-bit register contains the zero flag (Z), carry flag (C), auxiliary carry flag (AC), overflow flag
(OV), power down flag (PDF), and watchdog time-out flag (TO). These arithmetic/logical operation
and system management flags are used to record the status and operation of the microcontroller.
With the exception of the TO and PDF flags, bits in the status register can be altered by instructions
like most other registers. Any data written into the status register will not change the TO or PDF flag.
In addition, operations related to the status register may give different results due to the different
instruction operations. The TO flag can be affected only by a system power-up, a WDT time-out or
by executing the “CLR WDT” or “HALT” instruction. The PDF flag is affected only by executing
the “HALT” or “CLR WDT” instruction or during a system power-up.
The Z, OV, AC and C flags generally reflect the status of the latest operations.
• C is set if an operation results in a carry during an addition operation or if a borrow does not take
place during a subtraction operation; otherwise C is cleared. C is also affected by a rotate through
carry instruction.
• AC is set if an operation results in a carry out of the low nibbles in addition, or no borrow from
the high nibble into the low nibble in subtraction; otherwise AC is cleared.
• Z is set if the result of an arithmetic or logical operation is zero; otherwise Z is cleared.
• OV is set if an operation results in a carry into the highest-order bit but not a carry out of the
highest-order bit, or vice versa; otherwise OV is cleared.
• PDF is cleared by a system power-up or executing the “CLR WDT” instruction. PDF is set by
executing the “HALT” instruction.
• TO is cleared by a system power-up or executing the “CLR WDT” or “HALT” instruction. TO is
set by a WDT time-out.
In addition, on entering an interrupt sequence or executing a subroutine call, the status register will
not be pushed onto the stack automatically. If the contents of the status registers are important and if
the subroutine can corrupt the status register, precautions must be taken to correctly save it.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
STATUS Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
TO
PDF
OV
Z
AC
C
R/W
—
—
R
R
R/W
R/W
R/W
R/W
POR
—
—
0
0
×
×
×
×
"×" unknown
Bit 7~6
Unimplemented, read as "0"
Bit 5TO: Watchdog Time-Out flag
0: After power up or executing the "CLR WDT" or "HALT" instruction
1: A watchdog time-out occurred.
Bit 4PDF: Power down flag
0: After power up or executing the "CLR WDT" instruction
1: By executing the "HALT" instruction
Bit 3OV: Overflow flag
0: no overflow
1: an operation results in a carry into the highest-order bit but not a carry out of the
highest-order bit or vice versa.
Bit 2Z: Zero flag
0: The result of an arithmetic or logical operation is not zero
1: The result of an arithmetic or logical operation is zero
Bit 1AC: Auxiliary flag
0: no auxiliary carry
1: an operation results in a carry out of the low nibbles in addition, or no borrow
from the high nibble into the low nibble in subtraction
Bit 0C: Carry flag
0: no carry-out
1: an operation results in a carry during an addition operation or if a borrow does not
take place during a subtraction operation
C is also affected by a rotate through carry instruction.
EEPROM Data Memory
These devices contain an area of internal EEPROM Data Memory. EEPROM, which stands for
Electrically Erasable Programmable Read Only Memory, is by its nature a non-volatile form of
memory, with data retention even when its power supply is removed. By incorporating this kind
of data memory, a whole new host of application possibilities are made available to the designer.
The availability of EEPROM storage allows information such as product identification numbers,
calibration values, specific user data, system setup data or other product information to be stored
directly within the product microcontroller. The process of reading and writing data to the EEPROM
memory has been reduced to a very trivial affair.
EEPROM Data Memory Structure
The EEPROM Data Memory capacity is 32×8 bits for this series of devices. Unlike the Program
Memory and RAM Data Memory, the EEPROM Data Memory is not directly mapped and is
therefore not directly accessible in the same way as the other types of memory. Read and Write
operations to the EEPROM are carried out in single byte operations using two address registers and
one data register in Bank 0 and a single control register in Bank 1.
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EEPROM Registers
Three registers control the overall operation of the internal EEPROM Data Memory. These are the
address registers, EEA, the data register, EED and a single control register, EEC. As both the EEA
and EED registers are located in Bank 0, they can be directly accessed in the same way as any other
Special Function Register. The EEC register however, being located in Bank1, cannot be directly
addressed directly and can only be read from or written to indirectly using the MP1 Memory Pointer
and Indirect Addressing Register, IAR1. Because the EEC control register is located at address 40H
in Bank 1, the MP1 Memory Pointer must first be set to the value 40H and the Bank Pointer register,
BP, set to the value, 01H, before any operations on the EEC register are executed.
EEPROM Control Registers List
Name
Bit
7
6
5
4
3
2
1
0
EEA
—
—
—
D4
D3
D2
D1
D0
EED
D7
D6
D5
D4
D3
D2
D1
D0
EEC
—
—
—
—
WREN
WR
RDEN
RD
EEA Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
D4
D3
D2
D1
D0
R/W
—
—
—
R/W
R/W
R/W
R/W
R/W
POR
—
—
—
0
0
0
0
0
Bit 7 ~ 5
Unimplemented, read as “0”
Bit 4 ~ 0
Data EEPROM address
Data EEPROM address bit 4 ~ bit 0
EED Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7 ~ 0
Rev. 1.10
Data EEPROM data
Data EEPROM data bit 7 ~ bit 0
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EEC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
WREN
WR
RDEN
RD
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
0
0
0
Bit 7 ~ 4
Unimplemented, read as "0"
Bit 3WREN: Data EEPROM Write Enable
0: Disable
1: Enable
This is the Data EEPROM Write Enable Bit which must be set high before Data
EEPROM write operations are carried out. Clearing this bit to zero will inhibit Data
EEPROM write operations.
Bit 2WR: EEPROM Write Control
0: Write cycle has finished
1: Activate a write cycle
This is the Data EEPROM Write Control Bit and when set high by the application
program will activate a write cycle. This bit will be automatically reset to zero by the
hardware after the write cycle has finished. Setting this bit high will have no effect if
the WREN has not first been set high.
Bit 1RDEN: Data EEPROM Read Enable
0: Disable
1: Enable
This is the Data EEPROM Read Enable Bit which must be set high before Data
EEPROM read operations are carried out. Clearing this bit to zero will inhibit Data
EEPROM read operations.
Bit 0RD: EEPROM Read Control
0: Read cycle has finished
1: Activate a read cycle
This is the Data EEPROM Read Control Bit and when set high by the application
program will activate a read cycle. This bit will be automatically reset to zero by the
hardware after the read cycle has finished. Setting this bit high will have no effect if
the RDEN has not first been set high.
Note: The WREN, WR, RDEN and RD can not be set to “1” at the same time in one instruction. The
WR and RD can not be set to “1” at the same time.
Reading Data from the EEPROM
To read data from the EEPROM, the read enable bit, RDEN, in the EEC register must first be set
high to enable the read function. The EEPROM address of the data to be read must then be placed
in the EEA register. If the RD bit in the EEC register is now set high, a read cycle will be initiated.
Setting the RD bit high will not initiate a read operation if the RDEN bit has not been set. When
the read cycle terminates, the RD bit will be automatically cleared to zero, after which the data can
be read from the EED register. The data will remain in the EED register until another read or write
operation is executed. The application program can poll the RD bit to determine when the data is
valid for reading.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Writing Data to the EEPROM
The EEPROM address of the data to be written must first be placed in the EEA register and the data
placed in the EED register. To write data to the EEPROM, the write enable bit, WREN, in the EEC
register must first be set high to enable the write function. After this, the WR bit in the EEC register
must be immediately set high to initiate a write cycle. These two instructions must be executed
consecutively. The global interrupt bit EMI should also first be cleared before implementing any
write operations, and then set again after the write cycle has started. Note that setting the WR bit
high will not initiate a write cycle if the WREN bit has not been set. As the EEPROM write cycle is
controlled using an internal timer whose operation is asynchronous to microcontroller system clock,
a certain time will elapse before the data will have been written into the EEPROM. Detecting when
the write cycle has finished can be implemented either by polling the WR bit in the EEC register or
by using the EEPROM interrupt. When the write cycle terminates, the WR bit will be automatically
cleared to zero by the microcontroller, informing the user that the data has been written to the
EEPROM. The application program can therefore poll the WR bit to determine when the write cycle
has ended.
Write Protection
Protection against inadvertent write operation is provided in several ways. After the devices
are powered-on the Write Enable bit in the control register will be cleared preventing any write
operations. Also at power-on the Bank Pointer, BP, will be reset to zero, which means that Data
Memory Bank 0 will be selected. As the EEPROM control register is located in Bank 1, this adds a
further measure of protection against spurious write operations. During normal program operation,
ensuring that the Write Enable bit in the control register is cleared will safeguard against incorrect
write operations.
EEPROM Interrupt
The EEPROM write interrupt is generated when an EEPROM write cycle has ended. The EEPROM
interrupt must first be enabled by setting the DEE bit in the relevant interrupt register. When an
EEPROM write cycle ends, the DEF request flag will be set. If the global, EEPROM Interrupt are
enabled and the stack is not full, a subroutine call to the EEPROM Interrupt vector, will take place.
When the EEPROM Interrupt is serviced, the EEPROM Interrupt flag DEF will be automatically
cleared. The EMI bit will also be automatically cleared to disable other interrupts.
Rev. 1.10
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Programming Considerations
Care must be taken that data is not inadvertently written to the EEPROM. Protection can be Periodic
by ensuring that the Write Enable bit is normally cleared to zero when not writing. Also the Bank
Pointer could be normally cleared to zero as this would inhibit access to Bank 1where the EEPROM
control register exist. Although certainly not necessary, consideration might be given in the
application program to the checking of the validity of new write data by a simple read back process.
When writing data the WR bit must be set high immediately after the WREN bit has been set high,
to ensure the write cycle executes correctly. The global interrupt bit EMI should also be cleared
before a write cycle is executed and then re-enabled after the write cycle starts. Note that the devices
should not enter the IDLE or SLEEP mode until the EEPROM read or write operation is totally
complete. Otherwise, the EEPROM read or write operation will fail.
Programming Examples
• Reading data from the EEPROM - polling method
MOV A, EEPROM_ADRES ;
MOV EEA, A
MOV A, 040H ;
MOV MP1, A ;
MOV A, 01H ;
MOV BP, A
SET IAR1.1 ;
SET IAR1.0 ;
BACK:
SZ IAR1.0 ;
JMP BACK
CLR IAR1 ;
CLR BP
MOV A, EED ;
MOV READ_DATA, A
user defined address
setup memory pointer MP1
MP1 points to EEC register
setup Bank Pointer
set RDEN bit, enable read operations
start Read Cycle - set RD bit
check for read cycle end
disable EEPROM write
move read data to register
• Writing Data to the EEPROM - polling method
MOV A, EEPROM_ADRES MOV EEA, A
MOV A, EEPROM_DATA MOV EED, A
MOV A, 040H MOV MP1, A MOV A, 01H MOV BP, A
CLR EMI
SET IAR1.3 SET IAR1.2 SET EMI
BACK:
SZ IAR1.2 JMP BACK
CLR IAR1 CLR BP
Rev. 1.10
; user defined address
; user defined data
; setup memory pointer MP1
; MP1 points to EEC register
; setup Bank Pointer
; set WREN bit, enable write operations
; start Write Cycle - set WR bit– executed immediately after
; set WREN bit
; check for write cycle end
; disable EEPROM write
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Oscillator
Various oscillator options offer the user a wide range of functions according to their various
application requirements. The flexible features of the oscillator functions ensure that the best
optimisation can be achieved in terms of speed and power saving. Oscillator selections and operation
are selected through registers.
Oscillator Overview
In addition to being the source of the main system clock the oscillators also provide clock sources
for the Watchdog Timer and Time Base Interrupts. Two fully integrated internal oscillators, requiring
no external components, are provided to form a wide range of both fast and slow system oscillators.
The higher frequency oscillator provides higher performance but carry with it the disadvantage of
higher power requirements, while the opposite is of course true for the lower frequency oscillator.
With the capability of dynamically switching between fast and slow system clock, these devices
have the flexibility to optimize the performance/power ratio, a feature especially important in power
sensitive portable applications.
Type
Name
Freq.
Internal High Speed RC
HIRC
8MHz
Internal Low Speed RC
LIRC
32kHz
Oscillator Types
System Clock Configurations
There are two methods of generating the system clock, a high speed oscillator and a low speed
oscillator. The high speed oscillator is the internal 8MHz RC oscillator. The low speed oscillator is
the internal 32kHz RC oscillator. Selecting whether the low or high speed oscillator is used as the
system oscillator is implemented using the HLCLK bit and CKS2 ~ CKS0 bits in the SMOD register
and as the system clock can be dynamically selected.
fH/�
fH/�
High ��eed Oscillation
HIRC
fH/8
fH
P�escale�
f�Y�
fH/16
fH/3�
fH/6�
HLCLK
CK��~CK�0 �its
Low ��eed Oscillation
LIRC
fL
System Clock Configurations
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Internal RC Oscillator – HIRC
The internal RC oscillator is a fully integrated system oscillator requiring no external components.
The internal RC oscillator has a fixed frequency of 8MHz. Device trimming during the
manufacturing process and the inclusion of internal frequency compensation circuits are used to
ensure that the influence of the power supply voltage, temperature and process variations on the
oscillation frequency are minimised. As a result, at a power supply of 5V and at temperature of 25°C
degrees, the fixed oscillation frequency of the HIRC will have a tolerance within 2%.
Internal 32kHz Oscillator – LIRC
The internal 32kHz System Oscillator is the low frequency oscillator. It is a fully integrated
RC oscillator with a typical frequency of 32kHz at 5V, requiring no external components for its
implementation. Device trimming during the manufacturing process and the inclusion of internal
frequency compensation circuits are used to ensure that the influence of the power supply voltage,
temperature and process variations on the oscillation frequency are minimised.
Supplementary Oscillator
The low speed oscillator, in addition to providing a system clock source is also used to provide
a clock source to two other device functions. These are the Watchdog Timer and the Time Base
Interrupts.
Operating Modes and System Clocks
Present day applications require that their microcontrollers have high performance but often still
demand that they consume as little power as possible, conflicting requirements that are especially
true in battery powered portable applications. The fast clocks required for high performance will
by their nature increase current consumption and of course vice-versa, lower speed clocks reduce
current consumption. As Holtek has provided these devices with both high and low speed clock
sources and the means to switch between them dynamically, the user can optimise the operation of
their microcontroller to achieve the best performance/power ratio.
System Clocks
These devices have two different clock sources for both the CPU and peripheral function operation.
By providing the user with clock options using register programming, a clock system can be
configured to obtain maximum application performance.
The main system clock, can come from either a high frequency, fH, or a low frequency, fL, and is
selected using the HLCLK bit and CKS2~CKS0 bits in the SMOD register. The high speed system
clock can be sourced from HIRC oscillator. The low speed system clock source can be sourced from
the internal clock fL. The other choice, which is a divided version of the high speed system oscillator
has a range of fH/2~fH/64.
There is one additional internal clock for the peripheral circuits, the Time Base clock, fTBC. fTBC is
sourced from the LIRC oscillators. The fTBC clock is used as a source for the Time Base interrupt
functions and for the TMs.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
fH/�
fH/�
High ��eed Oscillation
fH/8
fH
HIRC
P�escale�
f�Y�
fH/16
fH/3�
fH/6�
HLCLK
CK��~CK�0 �its
Low ��eed Oscillation
fLIRC
LIRC
fL
WDT
fTBC
fTB
IDLEN
Ti�e Base 0
f�Y�/�
Ti�e Base 1
TBCK
System Clock Configurations
Note: When the system clock source fSYS is switched to fL from fH, the high speed oscillation will
stop to conserve the power. Thus there is no fH~fH/64 for peripheral circuit to use.
System Operation Modes
There are six different modes of operation for the microcontroller, each one with its own
special characteristics and which can be chosen according to the specific performance and
power requirements of the application. There are two modes allowing normal operation of the
microcontroller, the NORMAL Mode and SLOW Mode. The remaining four modes, the SLEEP0,
SLEEP1, IDLE0 and IDLE1 modes are used when the microcontroller CPU is switched off to
conserve power.
Description
Operating
Mode
CPU
fSYS
fLIRC
fTBC
NORMAL mode
On
fH~fH/64
On
On
SLOW mode
On
fL
On
On
IDLE0 mode
Off
Off
On
On
IDLE1 mode
Off
On
On
On
SLEEP0 mode
Off
Off
Off
Off
SLEEP1 mode
Off
Off
On
Off
NORMAL Mode
As the name suggests this is one of the main operating modes where the microcontroller has all
of its functions operational and where the system clock is provided the high speed oscillator. This
mode operates allowing the microcontroller to operate normally with a clock source will come from
the high speed oscillator HIRC. The high speed oscillator will however first be divided by a ratio
ranging from 1 to 64, the actual ratio being selected by the CKS2~CKS0 and HLCLK bits in the
SMOD register. Although a high speed oscillator is used, running the microcontroller at a divided
clock ratio reduces the operating current.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SLOW Mode
This is also a mode where the microcontroller operates normally although now with a slower
speed clock source. The clock source used will be from the low speed oscillator LIRC. Running
the microcontroller in this mode allows it to run with much lower operating currents. In the SLOW
Mode, the fH is off.
SLEEP0 Mode
The SLEEP Mode is entered when an HALT instruction is executed and when the IDLEN bit in the
SMOD register is low. In the SLEEP0 mode the CPU will be stopped, and the fLIRC clock will be
stopped too, and the Watchdog Timer function is disabled.
SLEEP1 Mode
The SLEEP Mode is entered when an HALT instruction is executed and when the IDLEN bit in the
SMOD register is low. In the SLEEP1 mode the CPU will be stopped. However the fLIRC clocks will
continue to operate if the Watchdog Timer function is enabled.
IDLE0 Mode
The IDLE0 Mode is entered when a HALT instruction is executed and when the IDLEN bit in the
SMOD register is high and the FSYSON bit in the SMOD1 register is low. In the IDLE0 Mode the
system oscillator will be inhibited from driving the CPU but some peripheral functions will remain
operational such as the Watchdog Timer and TMs. In the IDLE0 Mode, the system oscillator will be
stopped.
IDLE1 Mode
The IDLE1 Mode is entered when a HALT instruction is executed and when the IDLEN bit in the
SMOD register is high and the FSYSON bit in the SMOD1 register is high. In the IDLE1 Mode the
system oscillator will be inhibited from driving the CPU but may continue to provide a clock source
to keep some peripheral functions operational such as the Watchdog Timer and TMs. In the IDLE1
Mode, the system oscillator will continue to run, and this system oscillator may be high speed or low
speed system oscillator. In the IDLE1 Mode, the Watchdog Timer clock, fLIRC, will be on.
Control Register
A single register, SMOD, is used for overall control of the internal clocks within the device.
SMOD Register
Bit
7
6
5
4
3
2
1
0
Name
CKS2
CKS1
CKS0
—
LTO
HTO
IDLEN
HLCLK
R/W
R/W
R/W
R/W
—
R
R
R/W
R/W
POR
0
0
0
—
0
0
1
1
Bit 7 ~ 5
Rev. 1.10
CKS2 ~ CKS0: The system clock selection when HLCLK is “0”
000: fL (fLIRC)
001: fL (fLIRC)
010: fH/64
011: fH/32
100: fH/16
101: fH/8
110: fH/4
111: fH/2
These three bits are used to select which clock is used as the system clock source. In
addition to the system clock source, which can be the LIRC, a divided version of the
high speed system oscillator can also be chosen as the system clock source.
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Bit 4
Unimplemented, read as "0"
Bit 3LTO: Low speed system oscillator ready flag
0: Not ready
1: Ready
This is the low speed system oscillator ready flag which indicates when the low speed
system oscillator is stable after power on reset or a wake-up has occurred. The flag
will be low when in the SLEEP0 mode, but after a wake-up has occurred the flag will
change to a high level after 1~2 cycles if the LIRC oscillator is used.
Bit 2HTO: High speed system oscillator ready flag
0: Not ready
1: Ready
This is the high speed system oscillator ready flag which indicates when the high speed
system oscillator is stable. This flag is cleared to “0” by hardware when the device is
powered on and then changes to a high level after the high speed system oscillator is
stable. Therefore this flag will always be read as “1” by the application program after
device power-on.
Bit 1IDLEN: IDLE Mode Control
0: Disable
1: Enable
This is the IDLE Mode Control bit and determines what happens when the HALT
instruction is executed. If this bit is high, when a HALT instruction is executed the
device will enter the IDLE Mode. In the IDLE1 Mode the CPU will stop running
but the system clock will continue to keep the peripheral functions operational, if
FSYSON bit is high. If FSYSON bit is low, the CPU and the system clock will all stop
in IDLE0 mode. If the bit is low the device will enter the SLEEP Mode when a HALT
instruction is executed.
Bit 0HLCLK: System Clock Selection
0: fH/2 ~ fH/64 or fL
1: fH
This bit is used to select if the fH clock or the fH/2 ~ fH/64 or fL clock is used as the
system clock. When the bit is high the fH clock will be selected and if low the fH/2 ~
fH/64 or fL clock will be selected. When system clock switches from the fH clock to the
fL clock and the fH clock will be automatically switched off to conserve power.
SMOD1 Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
RSTF
LVRF
—
WRF
R/W
R/W
—
—
—
R/W
R/W
—
R/W
POR
0
—
—
—
0
x
—
0
“x” unknown
Bit 7 FSYSON: fSYS Control in IDLE Mode
0: Disable
1: Enable
Rev. 1.10
Bit 6~4
Unimplemented, read as 0
Bit 3
RSTF: Reset caused by RSTC setting
0: Not active
1: Active
This bit can be clear to “0”, but cannot set to “1”.
If this bit is set, only cleared by Software or POR reset.
Bit 2
LVRF: LVR function reset flag
0: Not active
1: Active
This bit can be clear to “0”, but can not be set to “1”.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Bit 1
Unimplemented, read as 0
Bit 0WRF: WDT Control register software reset flag
0: Not occur
1: Occurred
This bit is set to 1 by the WDT Control register software reset and cleared by the
application program. Note that this bit can only be cleared to 0 by the application
program.

­ 
    
 
­   Operating Mode Switching
The devices can switch between operating modes dynamically allowing the user to select the best
performance/power ratio for the present task in hand. In this way microcontroller operations that
do not require high performance can be executed using slower clocks thus requiring less operating
current and prolonging battery life in portable applications.
In simple terms, Mode Switching between the NORMAL Mode and SLOW Mode is executed
using the HLCLK bit and CKS2~CKS0 bits in the SMOD register while Mode Switching from the
NORMAL/SLOW Modes to the SLEEP/IDLE Modes is executed via the HALT instruction. When
a HALT instruction is executed, whether the device enters the IDLE Mode or the SLEEP Mode is
determined by the condition of the IDLEN bit in the SMOD register and FSYSON in the SMOD1
register.
When the HLCLK bit switches to a low level, which implies that clock source is switched from the
high speed clock source, fH, to the clock source, fH/2~fH/64 or fL. If the clock is from the fL, the high
speed clock source will stop running to conserve power. When this happens it must be noted that the
fH/16 and fH/64 internal clock sources will also stop running, which may affect the operation of other
internal functions such as the TMs.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
NORMAL Mode to SLOW Mode Switching
When running in the NORMAL Mode, which uses the high speed system oscillator, and therefore
consumes more power, the system clock can switch to run in the SLOW Mode by setting the
HLCLK bit to “0” and setting the CKS2~CKS0 bits to “000” or “001” in the SMOD register.This
will then use the low speed system oscillator which will consume less power. Users may decide to
do this for certain operations which do not require high performance and can subsequently reduce
power consumption.
The SLOW Mode is sourced from the LIRC oscillator and therefore requires this oscillator to be
stable before full mode switching occurs. This is monitored using the LTO bit in the SMOD register.
         
          ­           ­          Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SLOW Mode to NORMAL Mode Switching
In SLOW Mode the system uses LIRC low speed system oscillator. To switch back to the NORMAL
Mode, where the high speed system oscillator is used, the HLCLK bit should be set to “1” or
HLCLK bit is “0”, but CKS2~CKS0 is set to “010”, “011”, “100”, “101”, “110” or “111”. As a
certain amount of time will be required for the high frequency clock to stabilise, the status of the
HTO bit is checked.

          
          ­           ­           Entering the SLEEP0 Mode
There is only one way for the devices to enter the SLEEP0 Mode and that is to execute the “HALT”
instruction in the application program with the IDLEN bit in SMOD register equal to “0” and the
WDT off. When this instruction is executed under the conditions described above, the following will
occur:
• The system clock, WDT clock and Time Base clock will be stopped and the application program
will stop at the “HALT” instruction.
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and stopped.
• The I/O ports will maintain their present conditions.
• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,
will be cleared.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Entering the SLEEP1 Mode
There is only one way for the devices to enter the SLEEP1 Mode and that is to execute the “HALT”
instruction in the application program with the IDLEN bit in SMOD register equal to “0” and the
WDT on. When this instruction is executed under the conditions described above, the following will
occur:
• The system clock and Time Base clock will be stopped and the application program will stop at
the “HALT” instruction, but the WDT will remain with the clock source coming from the fLIRC
clock.
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and resume counting if the WDT is enabled.
• The I/O ports will maintain their present conditions.
• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,
will be cleared.
Entering the IDLE0 Mode
There is only one way for the device to enter the IDLE0 Mode and that is to execute the “HALT”
instruction in the application program with the IDLEN bit in SMOD register equal to “1” and the
FSYSON bit in SMOD1 register equal to “0”. When this instruction is executed under the conditions
described above, the following will occur:
• The system clock will be stopped and the application program will stop at the “HALT” instruction, but the Time Base clock will be on.
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and resume counting if the WDT is enabled.
• The I/O ports will maintain their present conditions.
• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,
will be cleared.
Entering the IDLE1 Mode
There is only one way for the devices to enter the IDLE1 Mode and that is to execute the “HALT”
instruction in the application program with the IDLEN bit in SMOD register equal to “1” and the
FSYSON bit in SMOD1 register equal to “1”. When this instruction is executed under the conditions
described above, the following will occur:
• The system clock and Time Base clock will be on and the application program will stop at the
“HALT” instruction.
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and resume counting if the WDT is enabled.
• The I/O ports will maintain their present conditions.
• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,
will be cleared.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Standby Current Considerations
As the main reason for entering the SLEEP or IDLE Mode is to keep the current consumption of
the devices to as low a value as possible, perhaps only in the order of several micro-amps except
in the IDLE1 Mode, there are other considerations which must also be taken into account by the
circuit designer if the power consumption is to be minimised. Special attention must be made to
the I/O pins on the device. All high-impedance input pins must be connected to either a fixed high
or low level as any floating input pins could create internal oscillations and result in increased
current consumption. This also applies to devices which have different package types, as there may
be unbonbed pins. These must either be setup as outputs or if setup as inputs must have pull-high
resistors connected.
Care must also be taken with the loads, which are connected to I/O pins, which are setup as
outputs. These should be placed in a condition in which minimum current is drawn or connected
only to external circuits that do not draw current, such as other CMOS inputs. In the IDLE1 Mode
the system oscillator is on, if the system oscillator is from the high speed system oscillator, the
additional standby current will also be perhaps in the order of several hundred micro-amps.
Wake-up
After the system enters the SLEEP or IDLE Mode, it can be woken up from one of various sources
listed as follows:
• An external reset
• An external falling edge on Port A
• A system interrupt
• A WDT overflow
If the system is woken up by an external reset, the device will experience a full system reset,
however, If these devices are woken up by a WDT overflow, a Watchdog Timer reset will be
initiated. Although both of these wake-up methods will initiate a reset operation, the actual source
of the wake-up can be determined by examining the TO and PDF flags. The PDF flag is cleared by a
system power-up or executing the clear Watchdog Timer instructions and is set when executing the
“HALT” instruction. The TO flag is set if a WDT time-out occurs, and causes a wake-up that only
resets the Program Counter and Stack Pointer, the other flags remain in their original status.
Each pin on Port A can be setup using the PAWU register to permit a negative transition on the pin
to wake-up the system. When a Port A pin wake-up occurs, the program will resume execution at
the instruction following the “HALT” instruction. If the system is woken up by an interrupt, then
two possible situations may occur. The first is where the related interrupt is disabled or the interrupt
is enabled but the stack is full, in which case the program will resume execution at the instruction
following the “HALT” instruction. In this situation, the interrupt which woke-up the device will not
be immediately serviced, but will rather be serviced later when the related interrupt is finally enabled
or when a stack level becomes free. The other situation is where the related interrupt is enabled and
the stack is not full, in which case the regular interrupt response takes place. If an interrupt request
flag is set high before entering the SLEEP or IDLE Mode, the wake-up function of the related
interrupt will be disabled.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Watchdog Timer
The Watchdog Timer is provided to prevent program malfunctions or sequences from jumping to
unknown locations, due to certain uncontrollable external events such as electrical noise.
Watchdog Timer Clock Source
The Watchdog Timer clock source is provided by the internal fLIRC clock which is supplied by the
LIRC oscillator. The Watchdog Timer source clock is then subdivided by a ratio of 28 to 215 to give
longer timeouts, the actual value being chosen using the WS2~WS0 bits in the WDTC register. The
LIRC internal oscillator has an approximate period of 32kHz at a supply voltage of 5V. However, it
should be noted that this specified internal clock period can vary with VDD, temperature and process
variations. The WDT can be enabled/disabled using the WDTC register.
Watchdog Timer Control Register
A single register, WDTC, controls the required timeout period as well as the enable/disable
operation. The WRF software reset flag will be indicated in the SMOD1 register. These registers
control the overall operation of the Watchdog Timer.
WDTC Register
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
WE4
WE3
WE2
WE1
WE0
WS2
WS1
WS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
1
0
1
0
0
1
1
Bit 7~ 3
WE4 ~ WE0: WDT function software control
10101: WDT disable
01010: WDT enable
Other values: Reset MCU
When these bits are changed to any other values by the environmental noise to reset
the microcontroller, the reset operation will be activated after 2~3 LIRC clock cycles
and the WRF bit will be set to 1to indicate the reset source.
Bit 2~ 0
WS2 ~ WS0: WDT Time-out period selection
000: 28/ fLIRC
001: 29/fLIRC
010: 210/fLIRC
011: 211/fLIRC(default)
100: 212/fLIRC
101: 213/fLIRC
110: 214/fLIRC
111: 215/fLIRC
These three bits determine the division ratio of the Watchdog Timer sourece clock,
which in turn determines the timeout period.
47
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SMOD1 Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
RSTF
LVRF
—
WRF
R/W
R/W
—
—
—
R/W
R/W
—
R/W
POR
0
—
—
—
0
x
—
0
“x” unknown
Bit 7 FSYSON: fSYS Control in IDLE Mode
0: Disable
1: Enable
Bit 6~4
Unimplemented, read as 0
Bit 3
RSTF: Reset caused by RSTC setting
0: Not active
1: Active
This bit can be clear to “0”, but cannot set to “1”.
If this bit is set, only clear by Software or POR reset.
Bit 2
LVRF: LVR function reset flag
0: Not active
1: Active
This bit can be clear to “0”, but can not be set to “1”.
Bit 1
Unimplemented, read as 0
Bit 0WRF: WDT Control register software reset flag
0: Not occur
1: Occurred
This bit is set to 1 by the WDT Control register software reset and cleared by the
application program. Note that this bit can only be cleared to 0 by the application program.
Watchdog Timer Operation
The Watchdog Timer operates by providing a device reset when its timer overflows. This means
that in the application program and during normal operation the user has to strategically clear the
Watchdog Timer before it overflows to prevent the Watchdog Timer from executing a reset. This is
done using the clear watchdog instructions. If the program malfunctions for whatever reason, jumps
to an unknown location, or enters an endless loop, the clear WDT instructions will not be executed
in the correct manner, in which case the Watchdog Timer will overflow and reset the device. With
regard to the Watchdog Timer enable/disable function, there are five bits, WE4~WE0, in the WDTC
register to additional enable/disable and reset control of the Watchdog Timer.
WE4 ~ WE0 Bits
WDT Function
10101B
Disable
01010B
Enable
Any other value
Reset MCU
Watchdog Timer Enable/Disable Control
Under normal program operation, a Watchdog Timer time-out will initialise a device reset and set
the status bit TO. However, if the system is in the SLEEP or IDLE Mode, when a Watchdog Timer
time-out occurs, the TO bit in the status register will be set and only the Program Counter and Stack
Pointer will be reset. Four methods can be adopted to clear the contents of the Watchdog Timer.
The first is a WDT reset, which means a value other than 01010B and 10101B is written into the
WE4~WE0 bit locations, the second is an external hardware reset, which means a low level on the
external reset pin, the third is using the Watchdog Timer software clear instructions and the fourth
is via a HALT instruction. There is only one method of using software instruction to clear the
Watchdog Timer. That is to use the single “CLR WDT” instruction to clear the WDT.
Rev. 1.10
48
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
The maximum time-out period is when the 215 division ratio is selected. As an example, with a 32
kHz LIRC oscillator as its source clock, this will give a maximum watchdog period of around 1
second for the 215 division ratio, and a minimum timeout of 7.8ms for the 28 division ration.
WDTC Registe�
WE�~WE0 �its
Reset MCU
CLR
RE� �in �eset
“CLR WDT”Inst�uction
“HALT”Inst�uction
LIRC
fLIRC
11-stage Divide�
8-to-1 MUX
7-stage Divide�
WDT Ti�e-out
(�8/fLIRC ~ �15/fLIRC)
W��~W�0
(fLIRC/�1 ~ fLIRC/�11)
Watchdog Timer
Reset and Initialisation
A reset function is a fundamental part of any microcontroller ensuring that the devices can be set
to some predetermined condition irrespective of outside parameters. The most important reset
condition is after power is first applied to the microcontroller. In this case, internal circuitry will
ensure that the microcontroller, after a short delay, will be in a well defined state and ready to
execute the first program instruction. After this power-on reset, certain important internal registers
will be set to defined states before the program commences. One of these registers is the Program
Counter, which will be reset to zero forcing the microcontroller to begin program execution from the
lowest Program Memory address.
In addition to the power-on reset, situations may arise where it is necessary to forcefully apply
a reset condition when the microcontroller is running. One example of this is where after power
has been applied and the microcontroller is already running, the RES line is forcefully pulled low.
In such a case, known as a normal operation reset, some of the microcontroller registers remain
unchanged allowing the microcontroller to proceed with normal operation after the reset line is
allowed to return high.
Another type of reset is when the Watchdog Timer overflows and resets the microcontroller. All
types of reset operations result in different register conditions being setup. Another reset exists in the
form of a Low Voltage Reset, LVR, where a full reset is implemented in situations where the power
supply voltage falls below a certain threshold.
Rev. 1.10
49
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Reset Functions
There are several ways in which a microcontroller reset can occur, through events occurring both
internally and externally:
Power-on Reset
The most fundamental and unavoidable reset is the one that occurs after power is first applied to
the microcontroller. As well as ensuring that the Program Memory begins execution from the first
memory address, a power-on reset also ensures that certain other registers are preset to known
conditions. All the I/O port and port control registers will power up in a high condition ensuring that
all pins will be first set to inputs.
Note: tRSTD is power-on delay, typical time=50ms
Power-On Reset Timing Chart
RES Pin Reset
Although the microcontroller has an internal RC reset function, if the VDD power supply rise time
is not fast enough or does not stabilise quickly at power-on, the internal reset function may be
incapable of providing proper reset operation. For this reason it is recommended that an external
RC network is connected to the RES pin, whose additional time delay will ensure that the RES pin
remains low for an extended period to allow the power supply to stabilise. During this time delay,
normal operation of the microcontroller will be inhibited. After the RES line reaches a certain
voltage value, the reset delay time tRSTD is invoked to provide an extra delay time after which the
microcontroller will begin normal operation. The abbreviation SST in the figures stands for System
Start-up Timer.
For most applications a resistor connected between VDD and the RES pin and a capacitor connected
between VSS and the RES pin will provide a suitable external reset circuit. Any wiring connected
to the RES pin should be kept as short as possible to minimize any stray noise interference. For
applications that operate within an environment where more noise is present the Enhanced Reset
Circuit shown is recommended.
Note: “*” It is recommended that this component is added for added ESD protection
“**” It is recommended that this component is added in environments where power line noise
is significant
External RES Circuit
Rev. 1.10
50
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
More information regarding external reset circuits is located in Application Note HA0075E on the
Holtek website.
Pulling the RES Pin low using external hardware will also execute a device reset. In this case, as in the case
of other resets, the Program Counter will reset to zero and program execution initiated from this point.
Note: tRSTD is power-on delay, typical time=16.7ms
RES Reset Timing Chart
• RSTC External Reset Register – HT66F002/HT66F003
Bit
7
6
5
4
3
2
1
0
Name
RSTC7
RSTC6
RSTC5
RSTC4
RSTC3
RSTC2
RSTC1
RSTC0
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
POR
0
1
0
1
0
1
0
1
Bit 7 ~ 0RSTC7 ~ RSTC0: PA7/RES selection
01010101: configured as PA7 pin or other function
10101010: configured as RES pin
Other Values: MCU reset (reset will be active after 2~3 LIRC clock for debounce time)
All reset will reset this register as POR value except WDT time out Hardware warm reset.
• RSTC External Reset Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
RSTC7
RSTC6
RSTC5
RSTC4
RSTC3
RSTC2
RSTC1
RSTC0
R/W
R/W
R/W
R/W
R/W
R
R
R/W
R/W
POR
0
1
0
1
0
1
0
1
Bit 7 ~ 0
RSTC7 ~ RSTC0: PC2/RES selection
01010101: Configured as PC2 pin or other function
10101010: Configured as RES pin
Other Values: MCU reset (reset will be active after 2~3 LIRC clock for debounce time)
All reset will reset this register as POR value except WDT time out Hardware warm reset.
Low Voltage Reset – LVR
The microcontroller contains a low voltage reset circuit in order to monitor the supply voltage of
the device and provide an MCU reset should the value fall below a certain predefined level. The
LVR function is always enabled during the normal and slow modes with a specific LVR voltage
VLVR. If the supply voltage of the device drops to within a range of 0.9V~VLVR such as might occur
when changing the battery, the LVR will automatically reset the device internally and the LVRF
bit in the SMOD1 register will also be set to1. For a valid LVR signal, a low voltage, i.e., a voltage
in the range between 0.9V~ VLVR must exist for greater than the value tLVR specified in the A.C.
characteristics. If the low voltage state does not exceed this value, the LVR will ignore the low
supply voltage and will not perform a reset function. The actual VLVR is 2.1V, the LVR will reset the
device after 2~3 LIRC clock cycles. Note that the LVR function will be automatically disabled when
the device enters the SLEEP/IDLE mode.
Note:tRSTD is power-on delay, typical time=50ms
Low Voltage Reset Timing Chart
Rev. 1.10
51
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
• SMOD1 Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
RSTF
LVRF
—
WRF
R/W
R/W
—
—
—
R/W
R/W
—
R/W
POR
0
—
—
—
0
x
—
0
“x” unknown
Bit 7 FSYSON: fSYS Control in IDLE Mode
Describe elsewhere
Bit 6~4
Unimplemented, read as 0
Bit 3
RSTF: Reset caused by RSTC setting
0: Not active
1: Active
This bit can be clear to “0”, but cannot set to “1”.
If this bit is set, only clear by Software or POR reset.
Bit 2
LVRF: LVR function reset flag
0: Not active
1: Active
This bit can be clear to “0”, but can not be set to “1”.
Bit 1
Unimplemented, read as 0
Bit 0WRF: WDT Control register software reset flag
Describe elsewhere
Watchdog Time-out Reset during Normal Operation
The Watchdog time-out Reset during normal operation is the same as an LVR reset except that the
Watchdog time-out flag TO will be set to “1”.
Note: tRSTD is power-on delay, typical time=16.7ms
WDT Time-out Reset during Normal Operation Timing Chart
Watchdog Time-out Reset during SLEEP or IDLE Mode
The Watchdog time-out Reset during SLEEP or IDLE Mode is a little different from other kinds
of reset. Most of the conditions remain unchanged except that the Program Counter and the Stack
Pointer will be cleared to “0” and the TO flag will be set to “1”. Refer to the A.C. Characteristics for
tSST details.
WDT Time-out Reset during SLEEP or IDLE Timing Chart
Rev. 1.10
52
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Reset Initial Conditions
The different types of reset described affect the reset flags in different ways. These flags, known
as PDF and TO are located in the status register and are controlled by various microcontroller
operations, such as the SLEEP or IDLE Mode function or Watchdog Timer. The reset flags are
shown in the table:
TO
PDF
0
0
Power-on reset
RESET Conditions
u
u
LVR reset during NORMAL or SLOW Mode operation
1
u
WDT time-out reset during NORMAL or SLOW Mode operation
1
1
WDT time-out reset during IDLE or SLEEP Mode operation
Note: “u” stands for unchanged
The following table indicates the way in which the various components of the microcontroller are
affected after a power-on reset occurs.
Item
Rev. 1.10
Condition After RESET
Program Counter
Reset to zero
Interrupts
All interrupts will be disabled
WDT
Clear after reset, WDT begins counting
Timer Modules
Timer Modules will be turned off
Input/Output Ports
I/O ports will be setup as inputs and AN0~AN3 as A/D input pins
Stack Pointer
Stack Pointer will point to the top of the stack
53
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
The different kinds of resets all affect the internal registers of the microcontroller in different ways.
To ensure reliable continuation of normal program execution after a reset occurs, it is important to
know what condition the microcontroller is in after a particular reset occurs. The following table
describes how each type of reset affects each of the microcontroller internal registers. Note that where
more than one package type exists the table will reflect the situation for the larger package type.
HT66F002
HT66F003
HT66F004
Program
Counter
●
●
●
0
MP0
●
●
●
1xxx xxxx
1xxx xxxx
1xxx xxxx
1xxx xxxx
1uuu uuuu
MP1
●
●
●
1xxx xxxx
1xxx xxxx
1xxx xxxx
1xxx xxxx
1uuu uuuu
BP
●
●
●
---- ---0
---- ---0
---- ---0
---- ---0
---- ---u
ACC
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
PCL
●
●
●
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
TBLP
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLH
●
●
●
--xx xxxx
--uu uuuu
--uu uuuu
--uu uuuu
--uu uuuu
STATUS
●
●
●
--00 xxxx
--1u uuuu
--uu uuuu
--01 uuuu
- - 11 u u u u
Register
Reset
(Power On)
0
0
H
WDT Time-out
(Normal
Operation)
0
0
0
H
RES Reset
(Normal
Operation)
0
0
0
H
RES Reset
(HALT)
0
0
0
H
WDT Time-out
(HALT)*
0
0
0
H
SMOD
●
●
●
0 0 0 - 0 0 11
0 0 0 - 0 0 11
0 0 0 - 0 0 11
0 0 0 - 0 0 11
uuu- uuuu
INTEG
●
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
INTC0
●
●
●
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
-000 -000
-000 -000
-000 -000
-000 -000
-uuu -uuu
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
--00 --00
--00 --00
--00 --00
--00 --00
--uu --uu
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
--00 --00
--00 --00
--00 --00
--00 --00
--uu --uu
INTC1
MFI0
●
●
●
●
●
●
MFI1
●
PA
●
●
●
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PAC
●
●
●
1111 1111
1111 1111
1111 1111
1111 1111
uuuu uuuu
PAPU
●
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
●
●
●
PAWU
IFS0
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
--00 --00
--00 --00
--00 --00
--00 --00
--uu --uu
●
0000 0-00
0000 0-00
0000 0-00
0000 0-00
uuuu u-uu
WDTC
●
●
0 1 0 1 0 0 11
0 1 0 1 0 0 11
0 1 0 1 0 0 11
0 1 0 1 0 0 11
uuuu uuuu
TBC
●
●
●
0 0 11 - 111
0 0 11 - 111
0 0 11 - 111
0 0 11 - 111
uuuu –uuu
SMOD1
●
●
●
0--- 0x-0
0--- 0x-0
0--- 0x-0
0--- 0x-0
u--- uu-u
●
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
EEA
●
●
●
---0 0000
---0 0000
---0 0000
---0 0000
---u uuuu
SCOMC
EED
●
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
SADOL
(ADRFS=0)
●
●
●
xxxx ----
xxxx ----
xxxx ----
xxxx ----
uuuu ----
SADOL
(ADRFS=1)
●
●
●
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
SADOH
(ADRFS=0)
●
●
●
xxxx xxxx
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
SADOH
(ADRFS=1)
●
●
●
---- xxxx
---- xxxx
---- xxxx
---- xxxx
---- uuuu
●
●
uuuu --uu
SADC0
SADC1
Rev. 1.10
●
●
0000 --00
0000 --00
0000 --00
0000 --00
●
0000 -000
0000 -000
0000 -000
0000 -000
uuuu -uuu
●
000- -000
000- -000
000- -000
000- -000
uuu- -uuu
54
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
HT66F002
HT66F003
HT66F004
Reset
(Power On)
SADC2
●
●
●
00-- 0000
00-- 0000
00-- 0000
00-- 0000
uu-- uuuu
RSTC
●
●
●
0101 0101
0101 0101
0101 0101
0101 0101
uuuu uuuu
PASR
●
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
--00 0000
--00 0000
--00 0000
--00 0000
--uu uuuu
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
Register
●
PBSR
●
WDT Time-out
(Normal
Operation)
RES Reset
(Normal
Operation)
RES Reset
(HALT)
WDT Time-out
(HALT)*
STM0C0
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
STM0C1
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
STM0DL
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
STM0DH
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
STM0AL
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
STM0AH
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM0C0
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0C1
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0DL
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0DH
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM0AL
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0AH
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM0RPL
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0RPH
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM1C0
●
●
0000 0---
0000 0---
0000 0---
0000 0---
uuuu u---
PTM1C1
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM1DL
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM1DH
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM1AL
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM1AH
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
PTM1RPL
●
●
0000 0000
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM1RPH
●
●
---- --00
---- --00
---- --00
---- --00
---- --uu
- - 11 1111
- - 11 1111
- - 11 1111
- - 11 1111
--uu uuuu
- 111 1111
- 111 1111
- 111 1111
- 111 1111
-uuu uuuu
- - 11 1111
- - 11 1111
- - 11 1111
- - 11 1111
--uu uuuu
- 111 1111
- 111 1111
- 111 1111
- 111 1111
-uuu uuuu
--00 0000
--00 0000
--00 0000
--00 0000
--uu uuuu
●
-000 0000
-000 0000
-000 0000
-000 0000
-uuu uuuu
PC
●
- - - - - 111
- - - - - 111
- - - - - 111
- - - - - 111
---- -uuu
PCC
●
- - - - - 111
- - - - - 111
- - - - - 111
- - - - - 111
---- -uuu
PCPU
●
---- -000
---- -000
---- -000
---- -000
---- -uuu
●
---- 0000
---- 0000
---- 0000
---- 0000
---- uuuu
●
PB
●
●
PBC
●
●
PBPU
EEC
●
●
Note: "*" stands for warm reset
"-" not implement
"u" stands for "unchanged"
"x" stands for "unknown"
Rev. 1.10
55
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Input/Output Ports
Holtek microcontrollers offer considerable flexibility on their I/O ports. With the input or output
designation of every pin fully under user program control, pull-high selections for all ports and
wake-up selections on certain pins, the user is provided with an I/O structure to meet the needs of a
wide range of application possibilities.
The devices provide bidirectional input/output lines labeled with port names PA~PC. These I/O
ports are mapped to the RAM Data Memory with specific addresses as shown in the Special Purpose
Data Memory table. All of these I/O ports can be used for input and output operations. For input
operation, these ports are non-latching, which means the inputs must be ready at the T2 rising edge
of instruction “MOV A, [m]”, where m denotes the port address. For output operation, all the data is
latched and remains unchanged until the output latch is rewritten.
I/O Control Register List
• HT66F002
Bit
Register
Name
7
6
5
4
3
2
1
0
PA
D7
D6
D5
D4
D3
D2
D1
D0
PAC
D7
D6
D5
D4
D3
D2
D1
D0
PAPU
D7
D6
D5
D4
D3
D2
D1
D0
PAWU
D7
D6
D5
D4
D3
D2
D1
D0
PASR
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
IFS0
—
—
—
—
INTPS1
INTPS0
STCK0PS STP0IPS
• HT66F003
7
6
5
4
3
2
1
0
PA
D7
D6
D5
D4
D3
D2
D1
D0
PAC
D7
D6
D5
D4
D3
D2
D1
D0
PAPU
D7
D6
D5
D4
D3
D2
D1
D0
PAWU
D7
D6
D5
D4
D3
D2
D1
D0
PB
—
—
D5
D4
D3
D2
D1
D0
PBC
—
—
D5
D4
D3
D2
D1
D0
PBPU
—
—
D5
D4
D3
D2
D1
D0
PASR
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
—
—
PBS5
PBS4
PBS3
PBS2
PBS1
PBS0
PBSR
IFS0
Rev. 1.10
Bit
Register
Name
PTCK1PS1 PTCK1PS0 STCK0PS
56
STP0IPS PTP1IPS
—
INTPS1 INTPS0
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
• HT66F004
Bit
Register
Name
7
6
5
4
3
2
1
0
PA
D7
D6
D5
D4
D3
D2
D1
D0
PAC
D7
D6
D5
D4
D3
D2
D1
D0
PAPU
D7
D6
D5
D4
D3
D2
D1
D0
PAWU
D7
D6
D5
D4
D3
D2
D1
D0
PB
—
D6
D5
D4
D3
D2
D1
D0
PBC
—
D6
D5
D4
D3
D2
D1
D0
PBPU
—
D6
D5
D4
D3
D2
D1
D0
PC
—
—
—
—
—
D2
D1
D0
PCC
—
—
—
—
—
D2
D1
D0
PCPU
—
—
—
—
—
D2
D1
D0
PASR
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
PBSR
—
PBS6
PBS5
PBS4
PBS3
PBS2
PBS1
PBS0
Pull-high Resistors
Many product applications require pull-high resistors for their switch inputs usually requiring the use
of an external resistor. To eliminate the need for these external resistors, all I/O pins, when configured
as an input have the capability of being connected to an internal pull-high resistor. These pull-high
resistors are selected using register PAPU~PCPU, and are implemented using weak PMOS transistors.
PAPU Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7 ~ 0
I/O Port A bit7~ bit 0 Pull-High Control
0: Disable
1: Enable
PBPU Register – HT66F003
Bit
7
6
5
4
3
2
1
0
Name
—
—
D5
D4
D3
D2
D1
D0
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
0
0
0
0
0
0
Bit 7~6
Bit 5~0
Unimplemented, read as 0
I/O Port B bit5~ bit 0 Pull-High Control
0: Disable
1: Enable
PBPU Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
—
D6
D5
D4
D3
D2
D1
D0
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit 7
Bit 6~0
Rev. 1.10
Unimplemented, read as 0
I/O Port B bit 6~ bit 0 Pull-High Control
0: Disable
1: Enable
57
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
PCPU Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
D2
D1
D0
R/W
—
—
—
—
—
R/W
R/W
R/W
POR
—
—
—
—
—
0
0
0
Bit 7~3
Unimplemented, read as 0
Bit 2~0
I/O Port C bit 2~ bit 0 Pull-High Control
0: Disable
1: Enable
Port A Wake-up
The HALT instruction forces the microcontroller into the SLEEP or IDLE Mode which preserves
power, a feature that is important for battery and other low-power applications. Various methods
exist to wake-up the microcontroller, one of which is to change the logic condition on one of the Port
A pins from high to low. This function is especially suitable for applications that can be woken up
via external switches. Each pin on Port A can be selected individually to have this wake-up feature
using the PAWU register.
PAWU Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7 ~ 0
I/O Port A bit 7 ~ bit 0 Wake Up Control
0: Disable
1: Enable
I/O Port Control Registers
Each I/O port has its own control register known as PAC~PCC, to control the input/output
configuration. With these control registers, each CMOS output or input can be reconfigured
dynamically under software control. Each pin of the I/O ports is directly mapped to a bit in its
associated port control register. For the I/O pin to function as an input, the corresponding bit of the
control register must be written as a “1”. This will then allow the logic state of the input pin to be
directly read by instructions. When the corresponding bit of the control register is written as a “0”,
the I/O pin will be setup as a CMOS output. If the pin is currently setup as an output, instructions
can still be used to read the output register. However, it should be noted that the program will in fact
only read the status of the output data latch and not the actual logic status of the output pin.
PAC Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
1
1
1
1
1
1
1
1
Bit 7 ~ 0
Rev. 1.10
I/O Port A bit 7 ~ bit 0 Input/Output Control
0: Output
1: Input
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PBC Register – HT66F003
Bit
7
6
5
4
3
2
1
0
Name
—
—
D5
D4
D3
D2
D1
D0
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
1
1
1
1
1
1
3
2
1
0
Bit 7 ~ 6
Unimplemented, read as 0
Bit 5 ~ 0
I/O Port B bit 5 ~ bit 0 Input/Output Control
0: Output
1: Input
PBC Register – HT66F004
Bit
7
6
5
4
Name
—
D6
D5
D4
D3
D2
D1
D0
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
1
1
1
1
1
1
1
2
1
0
Bit 7 Unimplemented, read as 0
Bit 6~0
I/O Port B bit 6 ~ bit 0 Input/Output Control
0: Output
1: Input
PCC Register – HT66F004
Bit
7
6
5
4
3
Name
—
—
—
—
—
D2
D1
D0
R/W
—
—
—
—
—
R/W
R/W
R/W
POR
—
—
—
—
—
1
1
1
Bit 7~3 Unimplemented, read as 0
Bit 2~0
I/O Port C bit 2 ~ bit 0 Input/Output Control
0: Output
1: Input
Pin-shared Functions
The flexibility of the microcontroller range is greatly enhanced by the use of pins that have more
than one function. Limited numbers of pins can force serious design constraints on designers but
by supplying pins with multi-functions, many of these difficulties can be overcome. The way in
which the pin function of each pin is selected is different for each function and a priority order is
established where more than one pin function is selected simultaneously. Additionally there are
a PASR and a PBSR register to establish certain pin functions. Generally speaking, the analog
function has higher priority than the digital function. However, if more than two analog functions
are enabled and the analog signal input comes from the same external pin, the analog input will be
internally connected to all of these active analog functional modules.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Pin-shared Registers
The limited number of supplied pins in a package can impose restrictions on the amount of functions
a certain device can contain. However by allowing the same pins to share several different functions
and providing a means of function selection, a wide range of different functions can be incorporated
into even relatively small package sizes.
• PASR Register – HT66F002
Bit
7
6
5
4
3
2
1
0
Name
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~6
PAS7~PAS6: Pin-Shared Control Bits
00: PA5/INT
01: STP0B
10: PA5/INT
11: AN3
Bit 5~4PAS5~PAS4: Pin-Shared Control Bits
00: PA2/INT
01: STP0
10: VREFO
11: AN2
Bit 3~2
PAS3~PAS2: Pin-Shared Control Bits
00: PA1
01: STP0B
10: VREF
11: AN1
Bit 1~0
PAS1~PAS0: Pin-Shared Control Bits
00: PA0/STP0I
01: STP0
10: PA0/STP0I
11: AN0
• PASR Register – HT66F003
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7
PAS7: Pin-Shared Control Bit
0: PA7/PTCK1
1: STP0B
Note: PAS7 is valid when RSTC=55H
Bit 6
PAS6: Pin-Shared Control Bit
0: PA6/PTCK1/STP0I
1: STP0
Bit 5
PAS5: Pin-Shared Control Bit
0: PA4/INT/PTCK1
1: STP0
Bit 4
PAS4: Pin-Shared Control Bit
0: PA3/INT/STCK0
1: AN3
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Bit 3
Bit 2~1
Bit 0
PAS3: Pin-Shared Control Bit
0: PA2/INT/STCK0
1: AN2
PAS2~PAS1: Pin-Shared Control Bits
0X: PA1
10: VREF
11: AN1
PAS0: Pin-Shared Control Bit
0: PA0/STP0I
1: AN0
• PASR Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
PAS7
PAS6
PAS5
PAS4
PAS3
PAS2
PAS1
PAS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~6PAS7~PAS6: Pin-Shared Control Bit
00: PA7
01: PTP1
10: PA7
11: AN6
Bit 5~4PAS5~PAS4: Pin-Shared Control Bit
0X: PA6
10: VREFO
11: AN5
Bit 3~2
PAS3~ PAS2: Pin-Shared Control Bit
0X: PA5
10: VREF
11: AN4
Bit 1PAS1: Pin-Shared Control Bits
0: PA4/PTCK1
1: AN3
Bit 0PAS0: Pin-Shared Control Bit
0: PA0
1: PTP0
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
• PBSR Register – HT66F003
Bit
7
6
5
4
3
2
1
0
Name
—
—
PBS5
PBS4
PBS3
PBS2
PBS1
PBS0
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
0
0
0
0
0
0
Bit 7~6
Unimplemented, read as “0”
Bit 5PBS5: Pin-Shared Control Bit
0: PB5
1: PTP1
Bit 4
PBS4: Pin-Shared Control Bit
0: PB4
1: PTP1B
Bit 3
PBS3: Pin-Shared Control Bit
0: PB3
1: PTP1
Bit 2
PBS2: Pin-Shared Control Bit
0: PB2
1: PTP1B
Bit 1
PBS1: Pin-Shared Control Bits
0: PB1/PTCK1
1: STP0B
Bit 0
PBS0: Pin-Shared Control Bit
0: PB0/PTP1I
1: VREFO
• PBSR Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
—
PBS6
PBS5
PBS4
PBS3
PBS2
PBS1
PBS0
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit 7
Unimplemented, read as “0”
Bit 6PBS6: Pin-Shared Control Bit
0: PB6
1: PTP1B
Bit 5PBS5: Pin-Shared Control Bit
0: PB5
1: PTP0B
Bit 4PBS4: Pin-Shared Control Bit
0: PB4
1: CLO
Note: PBS4 is valid when COM2EN=0
Bit 3PBS3: Pin-Shared Control Bit
0: PB3
1: AN7
Note: PBS3 is valid when COM3EN=0
Bit 2PBS2: Pin-Shared Control Bit
0: PB2/PTCK0
1: AN2
Bit 1PBS1: Pin-Shared Control Bits
0: PB1/INT1
1: AN1
Bit 0PBS0: Pin-Shared Control Bit
0: PB0/INT0
1: AN0
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
• IFS0 Register – HT66F002
Bit
7
6
Name
—
—
R/W
—
—
R/W
POR
—
—
0
Bit 7~6
5
4
3
2
1
0
—
—
INTPS1
INTPS0
R/W
—
—
R/W
R/W
0
—
—
0
0
STCK0PS STP0IPS
Unimplemented, read as "0"
Bit 5STCK0PS: STCK0 Pin Remapping Control
0: STCK0 on PA7 (default)
1: STCK0 on PA6
Bit 4
STP0IPS: STP0I Pin Remapping Control
0: STP0I on PA6 (default)
1: STP0I on PA0
Bit 3~2
Unimplemented, read as "0"
Bit 1~0
INTPS1, INTPS0: INT Pin Remapping Control
00: INT on PA5 (default)
01: INT on PA2
10: INT on PA3
11: INT on PA7
• IFS0 Register – HT66F003
Bit
Name
7
6
PTCK1PS1 PTCK1PS0
5
STCK0PS
4
3
STP0IPS PTP1IPS
2
—
1
0
INTPS1 INTPS0
R/W
R/W
R/W
R/W
R/W
R/W
—
R/W
R/W
POR
0
0
0
0
0
—
0
0
Bit 7~6
PTCK1PS1, PTCK1PS0: PTCK1 Pin Remapping Control
00: PTCK1 on PA4 (default)
01: PTCK1 on PA6
10: PTCK1 on PA7
11: PTCK1 on PB1
Bit 5STCK0PS: STCK0 Pin Remapping Control
0: STCK0 on PA3 (default)
1: STCK0 on PA2
Bit 4
STP0IPS: STP0I Pin Remapping Control
0: STP0I on PA6 (default)
1: STP0I on PA0
Bit 3PTP1IPS: PTP1I Pin Remapping Control
0: PTP1I on PA5 (default)
1: PTP1I on PB0
Rev. 1.10
Bit 2
Unimplemented, read as "0"
Bit 1~0
INTPS1, INTPS0: INT Pin Remapping Control
00: INT on PA3 (default)
01: INT on PA2
10: INT on PA4
11: INT on PA5
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
I/O Pin Structures
The accompanying diagrams illustrate the internal structures of some generic I/O pin types. As
the exact logical construction of the I/O pin will differ from these drawings, they are supplied as a
guide only to assist with the functional understanding of the I/O pins. The wide range of pin-shared
structures does not permit all types to be shown.
 
     Generic Input/Output Structure
 €  
 ­
­
   
A/D Input/Output Structure
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
System Clock output pin CLO
The device HT66F004 provides a system clock output pin CLO. MCU system clock can output to
the CLO pin by setting pin-shared control register bit PBS4 to 1. The highest output frequency is
8MHz in this device. Please note that when the noise problem is an important issue, it is better not to
use CLO output function.
Programming Considerations
Within the user program, one of the first things to consider is port initialisation. After a reset, all
of the I/O data and port control registers will be set high. This means that all I/O pins will default
to an input state, the level of which depends on the other connected circuitry and whether pullhigh selections have been chosen. If the port control registers are then programmed to setup some
pins as outputs, these output pins will have an initial high output value unless the associated port
data registers are first programmed. Selecting which pins are inputs and which are outputs can be
achieved byte-wide by loading the correct values into the appropriate port control register or by
programming individual bits in the port control register using the “SET [m].i” and “CLR [m].i”
instructions. Note that when using these bit control instructions, a read-modify-write operation takes
place. The microcontroller must first read in the data on the entire port, modify it to the required new
bit values and then rewrite this data back to the output ports.
Port A has the additional capability of providing wake-up functions. When the device is in the
SLEEP or IDLE Mode, various methods are available to wake the device up. One of these is a high
to low transition of any of the Port A pins. Single or multiple pins on Port A can be setup to have this
function.
Rev. 1.10
65
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Timer Modules – TM
One of the most fundamental functions in any microcontroller device is the ability to control and
measure time. To implement time related functions the devices include several Timer Modules,
abbreviated to the name TM. The TMs are multi-purpose timing units and serve to provide
operations such as Timer/Counter, Input Capture, Compare Match Output and Single Pulse Output
as well as being the functional unit for the generation of PWM signals. Each of the TMs has two
individual interrupts. The addition of input and output pins for each TM ensures that users are
provided with timing units with a wide and flexible range of features.
The common features of the different TM types are described here with more detailed information
provided in the individual Standard and Periodic TM sections.
Introduction
The devices contain one or two TMs depending upon which device is selected with each TM having
a reference name of TM0~TM1. Each individual TM can be categorised as a certain type, namely
Standard Type TM or Periodic Type TM. Although similar in nature, the different TM types vary in
their feature complexity. The common features to the Standard and Periodic TMs will be described
in this section and the detailed operation will be described in corresponding sections. The main
features and differences between the two types of TMs are summarised in the accompanying table.
STM
PTM
Timer/Counter
Function
√
√
I/P Capture
√
√
Compare Match Output
√
√
PWM Channels
1
1
Single Pulse Output
1
1
Edge
Edge
Duty or Period
Duty or Period
PWM Alignment
PWM Adjustment Period & Duty
TM Function Summary
Device
TM0
HT66F002
10-bit STM
TM1
—
HT66F003
10-bit STM
10-bit PTM
HT66F004
10-bit PTM
10-bit PTM
TM Name/Type Reference
TM Operation
The two different types of TMs offer a diverse range of functions, from simple timing operations
to PWM signal generation. The key to understanding how the TM operates is to see it in terms of
a free running counter whose value is then compared with the value of pre-programmed internal
comparators. When the free running counter has the same value as the pre-programmed comparator,
known as a compare match situation, a TM interrupt signal will be generated which can clear the
counter and perhaps also change the condition of the TM output pin. The internal TM counter is
driven by a user selectable clock source, which can be an internal clock or an external pin.
TM Clock Source
The clock source which drives the main counter in each TM can originate from various sources. The
selection of the required clock source is implemented using the xTnCK2~xTnCK0 bits in the xTM
control registers. The clock source can be a ratio of either the system clock fSYS or the internal high
clock fH, the fTBC clock source or the external xTCKn pin. The xTCKn pin clock source is used to
allow an external signal to drive the TM as an external clock source or for event counting.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
TM Interrupts
The Standard and Periodic type TMs each has two internal interrupts, the internal comparator A or
comparator P, which generate a TM interrupt when a compare match condition occurs. When a TM
interrupt is generated, it can be used to clear the counter and also to change the state of the TM output pin. TM External Pins
Each of the TMs, irrespective of what type, has two TM input pins, with the label xTCKn and
xTPnI. The TM input pin xTCKn, is essentially a clock source for the TM and is selected using the
xTnCK2~xTnCK0 bits in the xTMnC0 register. This external TM input pin allows an external clock
source to drive the internal TM. This external TM input pin is shared with other functions but will
be connected to the internal TM if selected using the xTnCK2~xTnCK0 bits. The TM input pin can
be chosen to have either a rising or falling active edge.
The other TM input pin, xTPnI, is the capture input whose active edge can be a rising edge, a falling
edge or both rising and falling edges and the active edge transition type is selected using the xTnIO1
and xTnIO0 bits in the xTMnC1 register.
The TMs each have two output pins with the label xTPn and xTPnB. When the TM is in the
Compare Match Output Mode, these pins can be controlled by the TM to switch to a high or low
level or to toggle when a compare match situation occurs. The external xTPn output pin is also the
pin where the TM generates the PWM output waveform. As the TM output pins are pin-shared with
other function, the TM output function must first be setup using registers. A single bit in one of the
registers determines if its associated pin is to be used as an external TM output pin or if it is to have
another function. The number of output pins for each TM type is different, the details are provided
in the accompanying table.
Device
TM0
TM1
HT66F002
STCK0, STP0I
STP0, STP0B
—
HT66F003
STCK0, STP0I
STP0, STP0B
PTCK1, PTP1I
PTP1, PTP1B
HT66F004
PTCK0, PTP0I
PTP0, PTP0B
PTCK1, PTP1I
PTP1, PTP1B
TM Input/Output Pins
TM Input/Output Pin Control Register
Selecting to have a TM input/output or whether to retain its other shared function is implemented
using one register, with a single bit in each register corresponding to a TM input/output pin.
Configuring the selection bits correctly will setup the corresponding pin as a TM input/output. The
details of the pin-shared function selection are described in the pin-shared function section.
STM
Inve�ting Out�ut
STP0B
Out�ut
STP0
Ca�tu�e In�ut
STP0I
TCK In�ut
STCK0
STM Function Pin Control Block Diagram
Rev. 1.10
67
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Inve�ting Out�ut PTPnB
PTM
Out�ut
PTPn
Ca�tu�e In�ut
PTPnI
TCK In�ut
PTCKn
PTM Function Pin Control Block Diagram
Programming Considerations
The TM Counter Registers and the Capture/Compare CCRA register, and CCRP register pair for
Periodic Timer Module, all have a low and high byte structure. The high bytes can be directly
accessed, but as the low bytes can only be accessed via an internal 8-bit buffer, reading or writing
to these register pairs must be carried out in a specific way. The important point to note is that data
transfer to and from the 8-bit buffer and its related low byte only takes place when a write or read
operation to its corresponding high byte is executed.
As the CCRA register and CCRP registers are implemented in the way shown in the following
diagram and accessing the register is carried out CCRP low byte register using the following
access procedures. Accessing the CCRA or CCRP low byte register without following these access
procedures will result in unpredictable values.
PTM Counter Register (Read only)
STM Counter Register (Read only)
STM0DL
PTMnDL
STM0DH
8-bit Buffer
8-bit Buffer
STM0AL
PTMnDH
PTMnAL
STM0AH
STM CCRA Register (Read/Write)
PTMnAH
PTM CCRA Register (Read/Write)
Data Bus
PTMnRPL PTMnRPH
PTM CCRP Register (Read/Write)
Data Bus
The following steps show the read and write procedures:
• Writing Data to CCRA or PTM CCRP
♦♦
Step 1. Write data to Low Byte STM0AL PTMnAL or PTMnRPL
––note that here data is only written to the 8-bit buffer.
♦♦
Step 2. Write data to High Byte STM0AH PTMnAH or PTMnRPH
––here data is written directly to the high byte registers and simultaneously data is latched
from the 8-bit buffer to the Low Byte registers.
• Reading Data from the Counter Registers and CCRA or PTM CCRP
Rev. 1.10
♦♦
Step 1. Read data from the High Byte STM0DH, STM0AH PTMnDH, PTMnAH or PTMnRPH
––here data is read directly from the High Byte registers and simultaneously data is latched
from the Low Byte register into the 8-bit buffer.
♦♦
Step 2. Read data from the Low Byte STM0DL, STM0AL PTMnDL, PTMnAL or PTMnRPL
––this step reads data from the 8-bit buffer.
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Standard Type TM – STM
The Standard Type TM contains five operating modes, which are Compare Match Output, Timer/
Event Counter, Capture Input, Single Pulse Output and PWM Output modes. The Standard TM can
be controlled with two external input pins and can drive two external output pins.
Device
TM Type
TM Name
TM Input Pin
TM Output Pin
HT66F002
HT66F003
10-bit STM
STM
STCK0, STP0I
STP0, STP0B
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Standard Type TM Block Diagram
Standard TM Operation
At its core is a 10-bit count-up counter which is driven by a user selectable internal clock source.
There are also two internal comparators with the names, Comparator A and Comparator P. These
comparators will compare the value in the counter with CCRP and CCRA registers. The CCRP is 3-bit
wide whose value is compared with the highest 3 bits in the counter while the CCRA is the 10 bits
and therefore compares with all counter bits.
The only way of changing the value of the 10-bit counter using the application program, is to
clear the counter by changing the ST0ON bit from low to high. The counter will also be cleared
automatically by a counter overflow or a compare match with one of its associated comparators.
When these conditions occur, a TM interrupt signal will also usually be generated. The Standard
Type TM can operate in a number of different operational modes, can be driven by different clock
sources and can also control an output pin. All operating setup conditions are selected using relevant
internal registers.
Rev. 1.10
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Standard Type TM Register Description
Overall operation of the Standard TM is controlled using series of registers. A read only register
pair exists to store the internal counter 10-bit value, while a read/write register pair exists to store
the internal 10-bit CCRA value. The remaining two registers are control registers which setup the
different operating and control modes as well as three CCRP bits.
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
STM0C0
ST0PAU
ST0CK2
ST0CK1
ST0CK0
ST0ON
ST0RP2
ST0RP1
ST0RP0
STM0C1
ST0M1
ST0M0
ST0IO1
ST0IO0
ST0OC
ST0POL
ST0DPX
ST0CCLR
STM0DL
D7
D6
D5
D4
D3
D2
D1
D0
STM0DH
—
—
—
—
—
—
D9
D8
STM0AL
D7
D6
D5
D4
D3
D2
D1
D0
STM0AH
—
—
—
—
—
—
D9
D8
10-bit Standard TM Register List
STM0C0 Register
Bit
7
6
5
4
3
2
1
0
Name
ST0PAU
ST0CK2
ST0CK1
ST0CK0
ST0ON
ST0RP2
ST0RP1
ST0RP0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
bit 7ST0PAU: STM Counter Pause Control
0: Run
1: Pause
The counter can be paused by setting this bit high. Clearing the bit to zero restores
normal counter operation. When in a Pause condition the STM will remain powered
up and continue to consume power. The counter will retain its residual value when
this bit changes from low to high and resume counting from this value when the bit
changes to a low value again.
bit 6~4ST0CK2~ST0CK0: Select STM Counter clock
000: fSYS/4
001: fSYS
010: fH/16
011: fH/64
100: fTBC
101: fTBC
110: STCK0 rising edge clock
111: STCK0 falling edge clock
These three bits are used to select the clock source for the STM. The external pin clock
source can be chosen to be active on the rising or falling edge. The clock source fSYS is
the system clock, while fH and fTBC are other internal clocks, the details of which can
be found in the oscillator section.
bit 3ST0ON: STM Counter On/Off Control
0: Off
1: On
This bit controls the overall on/off function of the STM. Setting the bit high enables
the counter to run, clearing the bit disables the STM. Clearing this bit to zero will
stop the counter from counting and turn off the STM which will reduce its power
consumption. When the bit changes state from low to high the internal counter value
will be reset to zero, however when the bit changes from high to low, the internal
counter will retain its residual value until the bit returns high again. If the STM is in
the Compare Match Output Mode or the PWM output Mode or Single Pulse Output
Mode then the STM output pin will be reset to its initial condition, as specified by the
ST0OC bit, when the ST0ON bit changes from low to high.
Rev. 1.10
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bit 2~0
ST0RP2~ ST0RP0: STM CCRP 3-bit register, compared with the STM Counter bit
9~bit 7
Comparator P Match Period
000: 1024 STM0 clocks
001: 128 STM0 clocks
010: 256 STM0 clocks
011: 384 STM0 clocks
100: 512 STM0 clocks
101: 640 STM0 clocks
110: 768 STM0 clocks
111: 896 STM0 clocks
These three bits are used to setup the value on the internal CCRP 3-bit register, which
are then compared with the internal counter’s highest three bits. The result of this
comparison can be selected to clear the internal counter if the ST0CCLR bit is set to
zero. Setting the ST0CCLR bit to zero ensures that a compare match with the CCRP
values will reset the internal counter. As the CCRP bits are only compared with the
highest three counter bits, the compare values exist in 128 clock cycle multiples.
Clearing all three bits to zero is in effect allowing the counter to overflow at its
maximum value.
STM0C1 Register
Rev. 1.10
Bit
7
6
5
4
3
Name
ST0M1
ST0M0
ST0IO1
ST0IO0
ST0OC
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
ST0POL ST0DPX ST0CCLR
bit 7~6
ST0M1~ ST0M0: Select STM0 Operating Mode
00: Compare Match Output Mode
01: Capture Input Mode
10: PWM output Mode or Single Pulse Output Mode
11: Timer/Counter Mode
These bits setup the required operating mode for the STM. To ensure reliable operation
the STM should be switched off before any changes are made to the ST0M1 and
ST0M0 bits. In the Timer/Counter Mode, the STM output pin state is undefined.
bit 5~4
ST0IO1~ ST0IO0: Select STM0 function
Compare Match Output Mode
00: No change
01: Output low
10: Output high
11: Toggle output
PWM output Mode/ Single Pulse Output Mode
00: PWM Output inactive state
01: PWM Output active state
10: PWM output
11: Single pulse output
Capture Input Mode
00: Input capture at rising edge of STP0I
01: Input capture at falling edge of STP0I
10: Input capture at falling/rising edge of STP0I
11: Input capture disabled
Timer/counter Mode:
Unused
These two bits are used to determine how the TM output pin changes state when a
certain condition is reached. The function that these bits select depends upon in which
mode the TM is running.
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In the Compare Match Output Mode, the ST0IO1~ST0IO0 bits determine how the TM
output pin changes state when a compare match occurs from the Comparator A. The
TM output pin can be setup to switch high, switch low or to toggle its present state
when a compare match occurs from the Comparator A. When the ST0IO1~ST0IO0
bits are both zero, then no change will take place on the output. The initial value of
the TM output pin should be setup using the ST0OC bit. Note that the output level
requested by the ST0IO1~ST0IO0 bits must be different from the initial value setup
using the ST0OC bit otherwise no change will occur on the TM output pin when a
compare match occurs. After the TM output pin changes state it can be reset to its
initial level by changing the level of the ST0ON bit from low to high.
In the PWM Mode, the ST0IO1 and ST0IO0 bits determine how the TM output pin
changes state when a certain compare match condition occurs. The PWM output
function is modified by changing these two bits. It is necessary to change the values of
the ST0IO1 and ST0IO0 bits only after the TM has been switched off. Unpredictable
PWM outputs will occur if the ST0IO1 and ST0IO0 bits are changed when the TM is
running.
Rev. 1.10
bit 3
ST0OC: STM0 Output control bit
Compare Match Output Mode
0: Initial low
1: Initial high
PWM output Mode/ Single Pulse Output Mode
0: Active low
1: Active high
This is the output control bit for the STM output pin. Its operation depends upon
whether STM is being used in the Compare Match Output Mode or in the PWM output
Mode/ Single Pulse Output Mode. It has no effect if the STM is in the Timer/Counter
Mode. In the Compare Match Output Mode it determines the logic level of the STM
output pin before a compare match occurs. In the PWM output Mode it determines
if the PWM signal is active high or active low. In the Single Pulse Output Mode it
determines the logic level of the STM output pin when the ST0ON bit changes from
low to high.
bit 2
ST0POL: STM0 Output polarity Control
0: Non-invert
1: Invert
This bit controls the polarity of the STM0 output pin. When the bit is set high the STM
output pin will be inverted and not inverted when the bit is zero. It has no effect if the
STM is in the Timer/Counter Mode.
bit 1
ST0DPX: STM0 PWM period/duty Control
0: CCRP - period; CCRA - duty
1: CCRP - duty; CCRA - period
This bit, determines which of the CCRA and CCRP registers are used for period and
duty control of the PWM waveform.
bit 0
ST0CCLR: Select STM0 Counter clear condition
0: STM0 Comparator P match
1: STM0 Comparator A match
This bit is used to select the method which clears the counter. Remember that the
Standard STM contains two comparators, Comparator A and Comparator P, either of
which can be selected to clear the internal counter. With the ST0CCLR bit set high,
the counter will be cleared when a compare match occurs from the Comparator A.
When the bit is low, the counter will be cleared when a compare match occurs from
the Comparator P or with a counter overflow. A counter overflow clearing method can
only be implemented if the CCRP bits are all cleared to zero. The ST0CCLR bit is not
used in the PWM output mode, Single Pulse or Input Capture Mode.
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STM0DL Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
3
2
1
0
Bit 7 ~ 0
STM0 Counter Low Byte Register bit 7 ~ bit 0
STM0 10-bit Counter bit 7 ~ bit 0
STM0DH Register
Bit
7
6
5
4
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R
R
POR
—
—
—
—
—
—
0
0
bit 7~2
Unimplemented, read as "0"
bit 1~0
STM0 Counter High Byte Register bit 1 ~ bit 0
STM0 10-bit Counter bit 9 ~ bit 8
STM0AL Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
bit 7~0
STM0 CCRA Low Byte Register bit 7 ~ bit 0
STM0 10-bit Counter bit 7 ~ bit 0
STM0AH Register
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R
R
POR
—
—
—
—
—
—
0
0
bit 7~2
Unimplemented, read as "0"
bit 1~0
STM0 CCRA High Byte Register bit 1 ~ bit 0
STM0 10-bit Counter bit 9 ~ bit 8
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Standard Type TM Operating Modes
The Standard Type TM can operate in one of five operating modes, Compare Match Output Mode,
PWM Output Mode, Single Pulse Output Mode, Capture Input Mode or Timer/Counter Mode. The
operating mode is selected using the ST0M1 and ST0M0 bits in the STM0C1 register.
Compare Output Mode
To select this mode, bits ST0M1 and ST0M0 in the STM0C1 register, should be set to 00
respectively. In this mode once the counter is enabled and running it can be cleared by three
methods. These are a counter overflow, a compare match from Comparator A and a compare match
from Comparator P. When the ST0CCLR bit is low, there are two ways in which the counter can be
cleared. One is when a compare match from Comparator P, the other is when the CCRP bits are all
zero which allows the counter to overflow. Here both STMA0F and STMP0F interrupt request flags
for Comparator A and Comparator P respectively, will both be generated.
If the ST0CCLR bit in the STM0C1 register is high then the counter will be cleared when a compare
match occurs from Comparator A. However, here only the STMA0F interrupt request flag will
be generated even if the value of the CCRP bits is less than that of the CCRA registers. Therefore
when ST0CCLR is high no STMP0F interrupt request flag will be generated. In the Compare
Match Output Mode, the CCRA can not be set to "0". If the CCRA bits are all zero, the counter will
overflow when its reaches its maximum 10-bit, 3FF Hex, value, however here the STMA0F interrupt
request flag will not be generated.
As the name of the mode suggests, after a comparison is made, the STM output pin, will change
state. The STM output pin condition however only changes state when an STMA0F interrupt request
flag is generated after a compare match occurs from Comparator A. The STMP0F interrupt request
flag, generated from a compare match occurs from Comparator P, will have no effect on the STM
output pin. The way in which the STM output pin changes state are determined by the condition of
the ST0IO1 and ST0IO0 bits in the STM0C1 register. The STM output pin can be selected using
the ST0IO1 and ST0IO0 bits to go high, to go low or to toggle from its present condition when a
compare match occurs from Comparator A. The initial condition of the STM output pin, which is
setup after the ST0ON bit changes from low to high, is setup using the ST0OC bit. Note that if the
ST0IO1 and ST0IO0 bits are zero then no pin change will take place.
Rev. 1.10
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0x3FF
�T0CCLR = 0; �T0M[1:0] = 00
Counte�
ove�flow
Counte� Value
CCRP > 0
Counte� clea�ed �y CCRP value
CCRP = 0
Counte�
Reset
Resu�e
CCRP > 0
CCRP
Pause
CCRA
�to�
Ti�e
�T0ON
�T0PAU
�T0POL
CCRP Int.
Flag �TMP0F
CCRA Int.
Flag �TMA0F
�TM O/P Pin
Out�ut Pin set
to Initial Level
Low if �T0OC= 0
Out�ut Toggle
with �TMA0F flag
Now �T0IO[1:0] = 10
Active High Out�ut �elect
Out�ut inve�ts
when �T0POL is high
Out�ut Pin
Reset to initial value
Out�ut not affected �y
�TMA0F flag. Re�ains High
until �eset �y �T0ON �it
Out�ut cont�olled
�y othe� �in - sha�ed function
He�e �T0IO[1:0] = 11
Toggle Out�ut �elect
Compare Match Output Mode – ST0CCLR = 0
Note: 1. With ST0CCLR = 0 a Comparator P match will clear the counter
2. The TM output pin controlled only by the STMA0F flag
3. The output pin reset to initial state by a ST0ON bit rising edge
Rev. 1.10
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�T0CCLR = 1; �T0M[1:0] = 00
Counte� Value
CCRA > 0
Counte� clea�ed �y CCRA value
0x3FF
Resu�e
CCRA
Pause
CCRP
CCRA = 0
Counte� ove�flow
CCRA = 0
�to�
Counte� Reset
Ti�e
�T0ON
�T0PAU
�T0POL
No �TMA0F flag
gene�ated on
CCRA ove�flow
CCRP Int.
Flag �TMA0F
CCRA Int.
Flag �TMP0F
�TM O/P Pin
Out�ut does
not change
�TMP0F not
gene�ated
Out�ut not affected �y
Out�ut Pin set
to Initial Level
Low if �T0OC= 0
Out�ut Toggle
with �TMA0F flag
�TMA0F flag. Re�ains High
Now �T0IO[1:0] = 10
Active High Out�ut �elect
He�e �T0IO[1:0] = 11
Toggle Out�ut �elect
until �eset �y �T0ON �it
Out�ut inve�ts
when �T0POL is high
Out�ut Pin
Reset to initial value
Out�ut cont�olled
�y othe� �in- sha�ed function
Compare Match Output Mode – ST0CCLR = 1
Note: 1. With ST0CCLR = 1 a Comparator A match will clear the counter
2. The TM output pin controlled only by the STMA0F flag
3. The output pin reset to initial state by a ST0ON rising edge
4. The STMP0F flag is not generated when ST0CCLR = 1
Rev. 1.10
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Timer/Counter Mode
To select this mode, bits ST0M1 and ST0M0 in the STM0C1 register should be set to 11
respectively. The Timer/Counter Mode operates in an identical way to the Compare Match Output
Mode generating the same interrupt flags. The exception is that in the Timer/Counter Mode the
STM output pin is not used. Therefore the above description and Timing Diagrams for the Compare
Match Output Mode can be used to understand its function. As the STM output pin is not used in
this mode, the pin can be used as a normal I/O pin or other pin-shared function by setting pin-share
function register.
PWM Output Mode
To select this mode, bits ST0M1 and ST0M0 in the STM0C1 register should be set to 10 respectively
and also the ST0IO1 and ST0IO0 bits should be set to 10 respectively. The PWM function within
the STM is useful for applications which require functions such as motor control, heating control,
illumination control etc. By providing a signal of fixed frequency but of varying duty cycle on the
STM output pin, a square wave AC waveform can be generated with varying equivalent DC RMS
values.
As both the period and duty cycle of the PWM waveform can be controlled, the choice of generated
waveform is extremely flexible. In the PWM output mode, the ST0CCLR bit has no effect as the
PWM period. Both of the CCRA and CCRP registers are used to generate the PWM waveform, one
register is used to clear the internal counter and thus control the PWM waveform frequency, while
the other one is used to control the duty cycle. Which register is used to control either frequency
or duty cycle is determined using the ST0DPX bit in the STM0C1 register. The PWM waveform
frequency and duty cycle can therefore be controlled by the values in the CCRA and CCRP registers.
An interrupt flag, one for each of the CCRA and CCRP, will be generated when a compare match
occurs from either Comparator A or Comparator P. The ST0OC bit in the STM0C1 register is used
to select the required polarity of the PWM waveform while the two ST0IO1 and ST0IO0 bits are
used to enable the PWM output or to force the STM output pin to a fixed high or low level. The
ST0POL bit is used to reverse the polarity of the PWM output waveform.
10-bit STM, PWM Output Mode, Edge-aligned Mode, ST0DPX=0
CCRP
001b
010b
011b
100b
101b
110b
111b
000b
Period
128
256
384
512
640
768
896
1024
Duty
CCRA
If fSYS = 16MHz, TM clock source is fSYS/4, CCRP = 100b and CCRA =128,
The STM PWM output frequency = (fSYS/4) / 512 = fSYS/2048 = 7.8125 kHz, duty = 128/512 = 25%.
If the Duty value defined by the CCRA register is equal to or greater than the Period value, then the
PWM output duty is 100%.
10-bit STM, PWM Output Mode, Edge-aligned Mode, ST0DPX=1
CCRP
001b
010b
011b
100b
Period
Duty
101b
110b
111b
000b
768
896
1024
CCRA
128
256
384
512
640
The PWM output period is determined by the CCRA register value together with the STM clock
while the PWM duty cycle is defined by the CCRP register value.
Rev. 1.10
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Counte�
Value
�T0DPX=0;�T0M[1:0]=10
Counte� Clea�ed�y CCRP
Counte� �eset when
�T0ON �etu�ns high
CCRP
Pause Resu�e
CCRA
Counte� �to� If
�T0ON �it low
Ti�e
�T0ON
�T0PAU
�T0POL
CCRA Int.
Flag �TMA0F
CCRP Int.
Flag �TMP0F
�TM O/P Pin
(�T0OC=1)
�TM O/P Pin
(�T0OC=0)
PWM Duty Cycle
set �y CCRA
Out�ut cont�olled �y
Othe� �in-sha�ed function
PWM �esu�es
o�e�ation
Out�ut Inve�ts
When �T0POL = 1
PWM Pe�iod
set �y CCRP
PWM Output Mode – ST0DPX = 0
Note: 1. Here ST0DPX = 0 - Counter cleared by CCRP
2. A counter clear sets PWM Period
3. The internal PWM function continues running even when ST0IO[1:0] = 00 or 01
4. The ST0CCLR bit has no influence on PWM operation
Rev. 1.10
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Counte�
Value
�T0DPX=1;�T0M[1:0]=10
Counte� Clea�ed �y CCRA
Counte� �eset when
�T0ON �etu�ns high
CCRA
Pause Resu�e
CCRP
Counte� �to� If
�T0ON �it low
Ti�e
�T0ON
�T0PAU
�T0POL
CCRP Int.
Flag �TMP0F
CCRA Int.
Flag �TMA0F
�TM O/P Pin
(�T0OC=1)
�TM O/P Pin
(�T0OC=0)
PWM Duty Cycle
set �y CCRP
Out�ut cont�olled �y
Othe� �in-sha�ed function
PWM �esu�es
o�e�ation
Out�ut Inve�ts
When �T0POL = 1
PWM Pe�iod
set �y CCRA
PWM Output Mode – ST0DPX = 1
Note: 1. Here ST0DPX = 1 - Counter cleared by CCRA
2. A counter clear sets PWM Period
3. The internal PWM function continues even when ST0IO[1:0] = 00 or 01
4. The ST0CCLR bit has no influence on PWM operation
Rev. 1.10
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Single Pulse Mode
To select this mode, bits ST0M1 and ST0M0 in the STM0C1 register should be set to 10
respectively and also the ST0IO1 and ST0IO0 bits should be set to 11 respectively. The Single Pulse
Output Mode, as the name suggests, will generate a single shot pulse on the STM output pin.
The trigger for the pulse output leading edge is a low to high transition of the ST0ON bit, which
can be implemented using the application program. However in the Single Pulse Mode, the ST0ON
bit can also be made to automatically change from low to high using the external STCK0 pin,
which will in turn initiate the Single Pulse output. When the ST0ON bit transitions to a high level,
the counter will start running and the pulse leading edge will be generated. The ST0ON bit should
remain high when the pulse is in its active state. The generated pulse trailing edge will be generated
when the ST0ON bit is cleared to zero, which can be implemented using the application program or
when a compare match occurs from Comparator A.
Leading Edge
Trailing Edge
ST0ON bit
0→1
ST0ON bit
1→0
S/W Command
SET“ST0ON”
or
STCK0 Pin
Transition
S/W Command
CLR“ST0ON”
or
CCRA Compare
Match
STP0/STP0B Output Pin
Pulse Width = CCRA Value
Single Pulse Generation
Rev. 1.10
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Counte� Value
�T0M [1:0] = 10 ; �T0IO [1:0] = 11
Counte� sto��ed
�y CCRA
Counte� Reset when
�T0ON �etu�ns high
CCRA
Pause
Counte� �to�s
�y softwa�e
Resu�e
CCRP
Ti�e
�T0ON
�oftwa�e
T�igge�
Auto. set �y
�TCK0 �in
Clea�ed �y
CCRA �atch
�TCK0 �in
�oftwa�e
T�igge�
�oftwa�e
T�igge�
�oftwa�e
�oftwa�e T�igge�
Clea�
�TCK0 �in
T�igge�
�T0PAU
�T0POL
No CCRP Inte��u�ts
gene�ated
CCRP Int. Flag
�TMP0F
CCRA Int. Flag
�TMA0F
�TM O/P Pin
(�T0OC=1)
�TM O/P Pin
(�T0OC=0)
Out�ut Inve�ts
when �T0POL = 1
Pulse Width
set �y CCRA
Single Pulse Mode
Note: 1. Counter stopped by CCRA match
2. CCRP is not used
3. The pulse is triggered by setting the ST0ON bit high
4. In the Single Pulse Mode, ST0IO [1:0] must be set to “11” and can not be changed.
However a compare match from Comparator A will also automatically clear the ST0ON bit and thus
generate the Single Pulse output trailing edge. In this way the CCRA value can be used to control the
pulse width. A compare match from Comparator A will also generate a STM interrupt. The counter
can only be reset back to zero when the ST0ON bit changes from low to high when the counter
restarts. In the Single Pulse Mode CCRP is not used. The ST0CCLR and ST0DPX bits are not used
in this Mode.
Rev. 1.10
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Capture Input Mode
To select this mode bits ST0M1 and ST0M0 in the STM0C1 register should be set to 01 respectively.
This mode enables external signals to capture and store the present value of the internal counter
and can therefore be used for applications such as pulse width measurements. The external signal is
supplied on the STP0I, whose active edge can be either a rising edge, a falling edge or both rising
and falling edges; the active edge transition type is selected using the ST0IO1 and ST0IO0 bits in
the STM0C1 register. The counter is started when the ST0ON bit changes from low to high which is
initiated using the application program.
When the required edge transition appears on the STP0I the present value in the counter will be
latched into the CCRA registers and a STM interrupt generated. Irrespective of what events occur on
the STP0I the counter will continue to free run until the ST0ON bit changes from high to low. When
a CCRP compare match occurs the counter will reset back to zero; in this way the CCRP value can be
used to control the maximum counter value. When a CCRP compare match occurs from Comparator
P, a STM interrupt will also be generated. Counting the number of overflow interrupt signals from
the CCRP can be a useful method in measuring long pulse widths. The ST0IO1 and ST0IO0 bits can
select the active trigger edge on the STP0I to be a rising edge, falling edge or both edge types. If the
ST0IO1 and ST0IO0 bits are both set high, then no capture operation will take place irrespective of
what happens on the STP0I, however it must be noted that the counter will continue to run.
The ST0CCLR and ST0DPX bits are not used in this Mode.
Counte� Value
�T0M [1:0] = 01
Counte� clea�ed
�y CCRP
Counte� Counte�
�to�
Reset
CCRP
YY
Pause
Resu�e
XX
Ti�e
�T0ON
�T0PAU
Active
edge
Active
edge
Active edge
�TM ca�tu�e �in
�TP0I
CCRA Int. Flag
�TMA0F
CCRP Int. Flag
�TMP0F
CCRA
Value
�T0IO [1:0]
Value
XX
00 – Rising edge
YY
01 – Falling edge
XX
10 – Both edges
YY
11 – Disa�le Ca�tu�e
Capture Input Mode
Note: 1. ST0M[1:0] = 01 and active edge set by the ST0IO[1:0] bits
2. A TM Capture input pin active edge transfers the counter value to CCRA
3. The ST0CCLR and ST0DPX bits are not used
4. No output function – ST0OC and ST0POL bits are not used
5. CCRP determines the counter value and the counter has a maximum count value when
CCRP is equal to zero.
Rev. 1.10
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Periodic Type TM – PTM
The Periodic Type TM contains five operating modes, which are Compare Match Output, Timer/
Event Counter, Capture Input, Single Pulse Output and PWM Output modes. The Periodic TM can
also be controlled with two external input pins and can drive two external output pins.
Device
Name
TM Input Pin
TM Output Pin
HT66F003
10-bit PTM
PTCK1, PTP1I
PTP1,PTP1B
10-bit PTM
PTCK0, PTP0I
PTCK1, PTP1I
PTP0,PTP0B
PTP1,PTP1B
HT66F004
Periodic TM Operation
At its core is a 10-bit count-up counter which is driven by a user selectable internal or external clock
source. There are two internal comparators with the names, Comparator A and Comparator P. These
comparators will compare the value in the counter with the CCRA and CCRP registers.
The only way of changing the value of the 10-bit counter using the application program, is to
clear the counter by changing the PTnON bit from low to high. The counter will also be cleared
automatically by a counter overflow or a compare match with one of its associated comparators.
When these conditions occur, a TM interrupt signal will also usually be generated. The Periodic
Type TM can operate in a number of different operational modes, can be driven by different clock
sources including an input pin and can also control the output pin. All operating setup conditions are
selected using relevant internal registers.
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Periodic Type TM Block Diagram (n=0 or 1)
Rev. 1.10
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Periodic Type TM Register Description
Overall operation of the Periodic TM is controlled using a series of registers. A read only register
pair exists to store the internal counter 10-bit value, while two read/write register pairs exist to store
the internal 10-bit CCRA and CCRP value. The remaining two registers are control registers which
setup the different operating and control modes.
Bit
Register
Name
5
4
3
2
1
0
PTMnC0
PTnPAU PTnCK2
7
6
PTnCKn
PTnCK0
PTnON
—
—
—
PTMnCn
PTnM1
PTnM0
PTnIO1
PTnIO0
PTnOC
PTnPOL
PTMnDL
D7
D6
D5
D4
D3
D2
D1
D0
PTnCKS PTnCCLR
PTMnDH
—
—
—
—
—
—
D9
D8
PTMnAL
D7
D6
D5
D4
D3
D2
D1
D0
PTMnAH
—
—
—
—
—
—
D9
D8
PTMnRPL
D7
D6
D5
D4
D3
D2
D1
D0
PTMnRPH
—
—
—
—
—
—
D9
D8
1
0
10-bit Periodic TM Register List (n=0 or 1)
PTMnC0 Register
Bit
7
6
5
4
3
2
Name
PTnPAU
PTnCK2
PTnCK1
PTnCK0
PTnON
—
—
—
R/W
R/W
R/W
R/W
R/W
R/W
—
—
—
POR
0
0
0
0
0
—
—
—
Bit 7PTnPAU: PTM Counter Pause Control
0: run
1: pause
The counter can be paused by setting this bit high. Clearing the bit to zero restores
normal counter operation. When in a Pause condition the TM will remain powered up
and continue to consume power. The counter will retain its residual value when this bit
changes from low to high and resume counting from this value when the bit changes
to a low value again.
Bit 6~4
Rev. 1.10
PTnCK2~PTnCK0: Select PTM Counter clock
000: fSYS/4
001: fSYS
010: fH/16
011: fH/64
100: fTBC
101: fTBC
110: PTCKn rising edge clock
111: PTCKn falling edge clock
These three bits are used to select the clock source for the TM. The external pin clock
source can be chosen to be active on the rising or falling edge. The clock source fSYS is
the system clock, while fTBC is another internal clock, the details of which can be found
in the oscillator section.
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Bit 3
PTnON: PTM Counter On/Off Control
0: Off
1: On
This bit controls the overall on/off function of the TM. Setting the bit high enables the
counter to run, clearing the bit disables the TM. Clearing this bit to zero will stop the
counter from counting and turn off the TM which will reduce its power consumption.
When the bit changes state from low to high the internal counter value will be reset to
zero, however when the bit changes from high to low, the internal counter will retain
its residual value until the bit returns high again.
If the TM is in the Compare Match Output Mode then the TM output pin will be reset
to its initial condition, as specified by the TM Output control bit, when the bit changes
from low to high.
Bit 2~0
Unimplemented, read as “0”
PTMnC1 Register
Bit
7
6
5
4
3
Name
PTnM1
PTnM0
PTnIO1
PTnIO0
PTnOC
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
PTnPOL PTnCKS PTnCCLR
Bit 7~6PTnM1~ PTnM0: Select PTM Operation Mode
00: Compare Match Output Mode
01: Capture Input Mode
10: PWM Mode or Single Pulse Output Mode
11: Timer/Counter Mode
These bits setup the required operating mode for the TM. To ensure reliable operation
the TM should be switched off before any changes are made to the PTnM1 and
PTnM0 bits. In the Timer/Counter Mode, the PTM output pin state is undefined.
Bit 5~4PTnIO1~ PTnIO0: Select PTM output function
Compare Match Output Mode
00: No change
01: Output low
10: Output high
11: Toggle output
PWM Mode/Single Pulse Output Mode
00: PWM Output inactive state
01: PWM Output active state
10: PWM output
11: Single pulse output
Capture Input Mode
00: Input capture at rising edge of PTPnI
01: Input capture at falling edge of PTPnI
10: Input capture at falling/rising edge of PTPnI
11: Input capture disabled
Timer/counter Mode
Unused
These two bits are used to determine how the TM output pin changes state when a
certain condition is reached. The function that these bits select depends upon in which
mode the TM is running.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
In the Compare Match Output Mode, the PTnIO1 and PTnIO0 bits determine how
the TM output pin changes state when a compare match occurs from the Comparator
A. The TM output pin can be setup to switch high, switch low or to toggle its present
state when a compare match occurs from the Comparator A. When these bits are
both zero, then no change will take place on the output. The initial value of the TM
output pin should be setup using the PTnOC bit. Note that the output level requested
by the PT1IO1 and PTnIO0 bits must be different from the initial value setup using
the PTnOC bit otherwise no change will occur on the TM output pin when a compare
match occurs. After the TM output pin changes state, it can be reset to its initial level
by changing the level of the PTnON bit from low to high.
In the PWM Mode, the PTnIO1 and PTnIO0 bits determine how the TM output pin
changes state when a certain compare match condition occurs. The PWM output
function is modified by changing these two bits. It is necessary to change the values of
the PTnIO1 and PTnIO0 bits only after the TM has been switched off. Unpredictable
PWM outputs will occur if the PTnIO1 and PTnIO0 bits are changed when the TM is
running.
Bit 3PTnOC: PTPn/PTPnB Output control bit
Compare Match Output Mode
0: initial low
1: initial high
PWM Mode/ Single Pulse Output Mode
0: Active low
1: Active high
This is the output control bit for the TM output pin. Its operation depends upon
whether TM is being used in the Compare Match Output Mode or in the PWM Mode/
Single Pulse Output Mode. It has no effect if the TM is in the Timer/Counter Mode. In
the Compare Match Output Mode it determines the logic level of the TM output pin
before a compare match occurs. In the PWM Mode it determines if the PWM signal is
active high or active low.
Bit 2PTnPOL: PTPn/PTPnB Output polarity Control
0: non-invert
1: invert
This bit controls the polarity of the PTPn/PTPnB output pin. When the bit is set high
the TM output pin will be inverted and not inverted when the bit is zero. It has no
effect if the TM is in the Timer/Counter Mode.
Bit 1PTnCKS: PTM capture trigger source select
0: From PTPnI
1: From PTCKn pin
Bit 0PTnCCLR: Select PTM Counter clear condition
0: PTM Comparatror P match
1: PTM Comparatror A match
This bit is used to select the method which clears the counter. Remember that the
Periodic TM contains two comparators, Comparator A and Comparator P, either of
which can be selected to clear the internal counter. With the PTnCCLR bit set high,
the counter will be cleared when a compare match occurs from the Comparator A.
When the bit is low, the counter will be cleared when a compare match occurs from
the Comparator P or with a counter overflow. A counter overflow clearing method can
only be implemented if the CCRP bits are all cleared to zero. The PTnCCLR bit is not
used in the PWM, Single Pulse or Input Capture Mode.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
PTMnDL Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
2
1
0
Bit 7~0PTMnDL: PTM Counter Low Byte Register bit 7 ~ bit 0
PTM 10-bit Counter bit 7 ~ bit 0
PTMnDH Register
Bit
7
6
5
4
3
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R
R
POR
—
—
—
—
—
—
0
0
Bit 7~2
Unimplemented, read as “0”
Bit 1~0PTMnDH: PTM Counter High Byte Register bit 1 ~ bit 0
PTM 10-bit Counter bit 9 ~ bit 8
PTMnAL Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~0PTMnAL: PTM CCRA Low Byte Register bit 7 ~ bit 0
PTM 10-bit CCRA bit 7 ~ bit 0
PTMnAH Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
2
1
0
Bit 7~2
Unimplemented, read as “0”
Bit 1~0PTMnAH: PTM CCRA High Byte Register bit 1 ~ bit 0
PTM 10-bit CCRA bit 9 ~ bit 8
PTMnRPL Register
Bit
7
6
5
4
3
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~0PTMnRPL: PTM CCRP Low Byte Register bit 7 ~ bit 0
PTM 10-bit CCRP bit 7 ~ bit 0
Rev. 1.10
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PTMnRPH Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
Bit 7~2
Unimplemented, read as "0"
Bit 1~0PTMnRPH: PTM CCRP High Byte Register bit 1 ~ bit 0
PTM 10-bit CCRP bit 9 ~ bit 8
Periodic Type TM Operating Modes
The Periodic Type TM can operate in one of five operating modes, Compare Match Output Mode,
PWM Output Mode, Single Pulse Output Mode, Capture Input Mode or Timer/Counter Mode. The
operating mode is selected using the PTnM1 and PTnM0 bits in the PTMnC1 register.
Compare Match Output Mode
To select this mode, bits PTnM1 and PTnM0 in the PTMnC1 register, should be all cleared to
00 respectively. In this mode once the counter is enabled and running it can be cleared by three
methods. These are a counter overflow, a compare match from Comparator A and a compare match
from Comparator P. When the PTnCCLR bit is low, there are two ways in which the counter can be
cleared. One is when a compare match occurs from Comparator P, the other is when the CCRP bits
are all zero which allows the counter to overflow. Here both the PTMAnF and PTMPnF interrupt
request flags for Comparator Aand Comparator P respectively, will both be generated.
If the PTnCCLR bit in the PTMnC1 register is high then the counter will be cleared when a compare
match occurs from Comparator A. However, here only the PTMAnF interrupt request flag will
be generated even if the value of the CCRP bits is less than that of the CCRA registers. Therefore
when PTnCCLR is high no PTMPnF interrupt request flag will be generated. In the Compare
Match Output Mode, the CCRA can not be set to “0”. If the CCRA bits are all zero, the counter will
overflow when its reaches its maximum 10-bit, 3FF Hex, value, however here the PTMAnF interrupt
request flag will not be generated.
As the name of the mode suggests, after a comparison is made, the TM output pin, will change state.
The TM output pin condition however only changes state when a PTMAnF interrupt request flag is
generated after a compare match occurs from Comparator A. The PTMPnF interrupt request flag,
generated from a compare match from Comparator P, will have no effect on the TM output pin.
The way in which the TM output pin changes state are determined by the condition of the PTnIO1
and PTnIO0 bits in the PTMnC1 register. The TM output pin can be selected using the PTnIO1
and PTnIO0 bits to go high, to go low or to toggle from its present condition when a compare
match occurs from Comparator A. The initial condition of the TM output pin, which is setup after
the PTnON bit changes from low to high, is setup using the PTnOC bit. Note that if the PTnIO1,
PTnIO0 bits are zero then no pin change will take place.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Counte� Value
Counte� ove�flow
CCRP=0
0x3FF
PTnCCLR = 0; PTnM [1:0] = 00
CCRP > 0
Counte� clea�ed �y CCRP value
CCRP > 0
Counte�
Resta�t
Resu�e
CCRP
Pause
CCRA
�to�
Ti�e
PTnON
PTnPAU
PTnPOL
CCRP Int. Flag
PTMPnF
CCRA Int. Flag
PTMAnF
PTM O/P
Pin
Out�ut �in set to
initial Level Low
if PTnOC=0
Out�ut not affected �y
PTMAnF flag. Re�ains High
until �eset �y PTnON �it
Out�ut Toggle with
PTMAnF flag
He�e PTnIO [1:0] = 11
Toggle Out�ut select
Note PTnIO [1:0] = 10
Active High Out�ut select
Out�ut Inve�ts
when PTnPOL is high
Out�ut Pin
Reset to Initial value
Out�ut cont�olled �y
othe� �in-sha�ed function
Compare Match Output Mode – PTnCCLR = 0 (n=0 or 1)
Note: 1. With PTnCCLR = 0 – a Comparator P match will clear the counter
2. The TM output pin is controlled only by the PTMAnF flag
3. The output pin is reset to initial state by a PTnON bit rising edge
Rev. 1.10
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Counte� Value
PTnCCLR = 1; PTnM [1:0] = 00
CCRA = 0
Counte� ove�flow
CCRA > 0 Counte� clea�ed �y CCRA value
0x3FF
CCRA=0
Resu�e
CCRA
Pause
�to�
Counte� Resta�t
CCRP
Ti�e
PTnON
PTnPAU
PTnPOL
No PTMAnF
flag gene�ated
on CCRA
ove�flow
CCRA Int. Flag
PTMAnF
CCRP Int. Flag
PTMPnF
PTM O/P
Pin
PTMPnF not
gene�ated
Out�ut �in set to
initial Level Low
if PTnOC=0
Out�ut does
not change
Out�ut not affected �y
TnAF flag. Re�ains High
until �eset �y PTnON �it
Out�ut Toggle with
PTMAnF flag
He�e PTnIO [1:0] = 11
Toggle Out�ut select
Note PTnIO [1:0] = 10
Active High Out�ut select
Out�ut Inve�ts
when PTnPOL is high
Out�ut Pin
Reset to Initial value
Out�ut cont�olled �y
othe� �in-sha�ed function
Compare Match Output Mode – PTnCCLR = 1 (n=0 or 1)
Note: 1. With PTnCCLR = 1 – a Comparator A match will clear the counter
2. The TM output pin is controlled only by the PTMAnF flag
3. The output pin is reset to initial state by a PTnON rising edge
4. The PTMPnF flag is not generated when PTnCCLR = 1
Rev. 1.10
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Timer/Counter Mode
To select this mode, bits PTnM1 and PTnM0 in the PTMnC1 register should all be set to 11
respectively. The Timer/Counter Mode operates in an identical way to the Compare Match Output
Mode generating the same interrupt flags. The exception is that in the Timer/Counter Mode the
TM output pin is not used. Therefore the above description and Timing Diagrams for the Compare
Match Output Mode can be used to understand its function. As the TM output pin is not used in this
mode, the pin can be used as a normal I/O pin or other pin-shared function.
PWM Output Mode
To select this mode, bits PTnM1 and PTnM0 in the PTMnC1 register should be set to 10 respectively
and also the PTnIO1 and PTnIO0 bits should be set to 10 respectively. The PWM function within
the TM is useful for applications which require functions such as motor control, heating control,
illumination control etc. By providing a signal of fixed frequency but of varying duty cycle on the
TM output pin, a square wave AC waveform can be generated with varying equivalent DC RMS
values.
As both the period and duty cycle of the PWM waveform can be controlled, the choice of generated
waveform is extremely flexible. In the PWM mode, the PTnCCLR bit has no effect as the PWM
period. Both of the CCRP and CCRA registers are used to generate the PWM waveform, one register
is used to clear the internal counter and thus control the PWM waveform frequency, while the other
one is used to control the duty cycle. The PWM waveform frequency and duty cycle can therefore
be controlled by the values in the CCRA and CCRP registers.
An interrupt flag, one for each of the CCRA and CCRP, will be generated when a compare match
occurs from either Comparator A or Comparator P. The PTnOC bit in the PTMnC1 register is used to
select the required polarity of the PWM waveform while the two PTnIO1 and PTnIO0 bits are used
to enable the PWM output or to force the TM output pin to a fixed high or low level. The PTnPOL
bit is used to reverse the polarity of the PWM output waveform.
10-bit PWM Mode, Edge-aligned Mode
CCRP
Period
Duty
CCRP = 0~1024
CCRP=0 : period= 1024 clocks
CCRP=1~1023: period=1~1023 clocks
CCRA
If fSYS = 16MHz, PTM clock source select fSYS/4, CCRP = 100b and CCRA = 128,
The PTM PWM output frequency = (fSYS/4)/512 = fSYS/2048 = 7.8125kHz, duty = 128/512 = 25%
If the Duty value defined by the CCRA register is equal to or greater than the Period value, then the
PWM output duty is 100%.
Rev. 1.10
91
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Counte� Value
PTnDPX = 0; PTnM [1:0] = 10
Counte� clea�ed
�y CCRP
Counte� Reset when
PTnON �etu�ns high
CCRP
Pause Resu�e
CCRA
Counte� �to� if
PTnON �it low
Ti�e
PTnON
PTnPAU
PTnPOL
CCRA Int. Flag
PTMAnF
CCRP Int. Flag
PTMPnF
PTM O/P Pin
(PTnOC=1)
PTM O/P Pin
(PTnOC=0)
PWM Duty Cycle
set �y CCRA
PWM Pe�iod
set �y CCRP
PWM �esu�es
o�e�ation
Out�ut cont�olled �y
Out�ut Inve�ts
othe� �in-sha�ed function
When PTnPOL = 1
PWM Output Mode (n=0 or 1)
Note: 1. Here Counter cleared by CCRP
2. A counter clear sets the PWM Period
3. The internal PWM function continues running even when PTnIO[1:0] = 00 or 01
4. The PTnCCLR bit has no influence on PWM operation
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Single Pulse Output Mode
To select this mode, the required bit pairs, PTnM1 and PTnM0 should be set to 10 respectively and
also the corresponding PTnIO1 and PTnIO0 bits should be set to 11 respectively. The Single Pulse
Output Mode, as the name suggests, will generate a single shot pulse on the TM output pin.
The trigger for the pulse output leading edge is a low to high transition of the PTnON bit, which
can be implemented using the application program. However in the Single Pulse Mode, the PTnON
bit can also be made to automatically change from low to high using the external PTCKn pin,
which will in turn initiate the Single Pulse output. When the PTnON bit transitions to a high level,
the counter will start running and the pulse leading edge will be generated. The PTnON bit should
remain high when the pulse is in its active state. The generated pulse trailing edge will be generated
when the PTnON bit is cleared to zero, which can be implemented using the application program or
when a compare match occurs from Comparator A.
However a compare match from Comparator A will also automatically clear the PTnON bit and thus
generate the Single Pulse output trailing edge. In this way the CCRA value can be used to control
the pulse width. A compare match from Comparator A will also generate TM interrupts. The counter
can only be reset back to zero when the PTnON bit changes from low to high when the counter
restarts. In the Single Pulse Mode CCRP is not used. The PTnCCLR bit is also not used.
Leading Edge
Trailing Edge
PTnON bit
0→1
PTnON bit
1→0
S/W Command
SET“PTnON”
or
PTCKn Pin
Transition
S/W Command
CLR“PTnON”
or
CCRA Compare
Match
PTPn/PTPnB Output Pin
Pulse Width = CCRA Value
Single Pulse Generation (n=0 or 1)
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Counte� Value
PTnM [1:0] = 10 ; PTnIO [1:0] = 11
Counte� sto��ed
�y CCRA
Counte� Reset when
PTnON �etu�ns high
CCRA
Pause
Counte� �to�s
�y softwa�e
Resu�e
CCRP
Ti�e
PTnON
�oftwa�e
T�igge�
Auto. set �y
PTCKn �in
Clea�ed �y
CCRA �atch
PTCKn �in
�oftwa�e
T�igge�
�oftwa�e
T�igge�
�oftwa�e
�oftwa�e T�igge�
Clea�
PTCKn �in
T�igge�
PTnPAU
PTnPOL
No CCRP Inte��u�ts
gene�ated
CCRP Int. Flag
PTMPnF
CCRA Int. Flag
PTMAnF
PTM O/P Pin
(PTnOC=1)
PTM O/P Pin
(PTnOC=0)
Out�ut Inve�ts
when PTnPOL = 1
Pulse Width
set �y CCRA
Single Pulse Mode
Note: 1. Counter stopped by CCRA
2. CCRP is not used
3. The pulse is triggered by the PTCKn pin or by setting the PTnON bit high
4. A PTCKn pin active edge will automatically set the PTnON bit high
5. In the Single Pulse Mode, PTnIO [1:0] must be set to “11” and can not be changed.
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Capture Input Mode
To select this mode bits PTnM1 and PTnM0 in the PTMnC1 register should be set to 01 respectively.
This mode enables external signals to capture and store the present value of the internal counter
and can therefore be used for applications such as pulse width measurements. The external signal
is supplied on the PTPnI or PTCKn pin, selected by the PTnCKS bit in the PTMnC1 register. The
input pin active edge can be either a rising edge, a falling edge or both rising and falling edges; the
active edge transition type is selected using the PTnIO1 and PTnIO0 bits in the PTMnC1 register.
The counter is started when the PTnON bit changes from low to high which is initiated using the
application program.
When the required edge transition appears on the PTPnI or PTCKn pin the present value in the
counter will be latched into the CCRA register and a TM interrupt generated. Irrespective of what
events occur on the PTPnI or PTCKn pin the counter will continue to free run until the PTnON bit
changes from high to low. When a CCRP compare match occurs the counter will reset back to zero;
in this way the CCRP value can be used to control the maximum counter value. When a CCRP
compare match occurs from Comparator P, a TM interrupt will also be generated. Counting the
number of overflow interrupt signals from the CCRP can be a useful method in measuring long pulse
widths. The PTnIO1 and PTnIO0 bits can select the active trigger edge on the PTPnI or PTCKn pin
to be a rising edge, falling edge or both edge types. If the PTnIO1 and PTnIO0 bits are both set high,
then no capture operation will take place irrespective of what happens on the PTPnI or PTCKn pin,
however it must be noted that the counter will continue to run.
As the PTPnI or PTCKn pin is pin shared with other functions, care must be taken if the PTM is in
the Capture Input Mode. This is because if the pin is setup as an output, then any transitions on this
pin may cause an input capture operation to be executed. The PTnCCLR, PTnOC and PTnPOL bits
are not used in this Mode.
Rev. 1.10
95
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Counte� Value
PTnM [1:0] = 01
Counte� clea�ed
�y CCRP
Counte� Counte�
Reset
�to�
CCRP
YY
Pause
Resu�e
XX
Ti�e
PTnON
PTnPAU
PTM ca�tu�e
�in PTPnI
o� PTCKn
Active
edge
Active
edge
Active edge
CCRA Int. Flag
PTMAnF
CCRP Int. Flag
PTMPnF
CCRA
Value
PTnIO [1:0]
Value
XX
00 – Rising edge
YY
XX
01 – Falling edge 10 – Both edges
YY
11 – Disa�le Ca�tu�e
Capture Input Mode (n=0 or 1)
Note: 1. PTnM[1:0] = 01 and active edge set by the PTnIO[1:0] bits
2. A TM Capture input pin active edge transfers counter value to CCRA
3. The PTnCCLR bit is not used
4. No output function – PTnOC and PTnPOL bits are not used
5. CCRP determines the counter value and the counter has a maximum count value when
CCRP is equal to zero
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Analog to Digital Converter
The need to interface to real world analog signals is a common requirement for many electronic
systems. However, to properly process these signals by a microcontroller, they must first be
converted into digital signals by A/D converters. By integrating the A/D conversion electronic
circuitry into the microcontroller, the need for external components is reduced significantly with the
corresponding follow-on benefits of lower costs and reduced component space requirements.
A/D Overview
The devices contain a multi-channel analog to digital converter which can directly interface
to external analog signals, such as that from sensors or other control signals and convert these
signals directly into a 12-bit digital value. The external or internal analog signal to be converted is
determined by the SAINS and SACS bit fields. Note that when the internal analog signal is to be
converted, the pin-shared control bits should also be properly configured except the SAINS and
SACS bit fields. More detailed information about the A/D input signal is described in the “A/D
Converter Control Registers” and “A/D Converter Input Signal” sections respectively.
Part No.
Input Channels
A/D Channel Select Bits
Input Pins
HT66F002/HT66F003
4
SAINS2~SAINS0,
SACS1~SACS0
AN0~AN3
HT66F004
8
SAINS2~SAINS0,
SACS2~SACS0
AN0~AN7
The accompanying block diagram shows the overall internal structure of the A/D converter, together
with its associated registers.
Pin-sha�ed selection
�AC�[�:0]
ENADC
AN0
AN5
AN6
AN7
�APIN
MUX
1�-�it
�AR ADC
AVDD
VR
ADBZ
�ADOH[7:0]
�AINT
�ADOL[7:0]
VREFO
�AIN�[�:0]
Divide�
VREFO
f�Y�
AVDD
VR
PA�R
VREF
VBG
(1.0�V)
�ACK�[�:0]
ENOPA
VRI
OPA
�AVR�[3:0]
A/D Converter Structure
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
A/D Converter Register Description
Overall operation of the A/D converter is controlled using five registers. A read only register pair
exists to store the ADC data 12-bit value. The remaining three registers are control registers which
setup the operating and control function of the A/D converter.
Bit
Name
7
6
5
4
3
2
1
0
SADOL
(ADRFS=0)
D3
D2
D1
D0
—
—
—
—
SADOL
(ADRFS=1)
D7
D6
D5
D4
D3
D2
D1
D0
SADOH
(ADRFS=0)
D11
D10
D9
D8
D7
D6
D5
D4
SADOH
(ADRFS=1)
—
—
—
—
D11
D10
D9
D8
SACS0
SADC0
START
ADBZ
ENADC
ADRFS
—
—
SACS1
SADC1
SAINS2
SAINS1
SAINS0
—
—
SACK2
SACK1
SACK0
SADC2
ENOPA
VBGEN
—
—
SAVRS3
SAVRS2
SAVRS1
SAVRS0
A/D Converter Register List – HT66F002/HT66F003
Bit
Name
7
6
5
4
3
2
1
0
SADOL
(ADRFS=0)
D3
D2
D1
D0
—
—
—
—
SADOL
(ADRFS=1)
D7
D6
D5
D4
D3
D2
D1
D0
SADOH
(ADRFS=0)
D11
D10
D9
D8
D7
D6
D5
D4
SADOH
(ADRFS=1)
—
—
—
—
D11
D10
D9
D8
SADC0
START
ADBZ
ENADC
ADRFS
—
SACS2
SACS1
SACS0
SADC1
SAINS2
SAINS1
SAINS0
—
—
SADC2
ENOPA
VBGEN
—
—
SAVRS3
SACKS2 SACKS1 SACKS0
SAVRS2
SAVRS1
SAVRS0
A/D Converter Register List – HT66F004
A/D Converter Data Registers – SADOL, SADOH
As the devices contain an internal 12-bit A/D converter, it requires two data registers to store the
converted value. These are a high byte register, known as SADOH, and a low byte register, known
as SADOL. After the conversion process takes place, these registers can be directly read by the
microcontroller to obtain the digitised conversion value. As only 12 bits of the 16-bit register space
is utilised, the format in which the data is stored is controlled by the ADRFS bit in the SADC0
register as shown in the accompanying table. D0~D11 are the A/D conversion result data bits.
Any unused bits will be read as zero. Note that the A/D converter data register contents will not be
cleared to zero if the A/D converter is disabled.
ADRFS
0
1
SADOH
7
6
D11 D10
0
0
5
4
D9
D8
0
0
SADOL
3
2
1
0
7
6
5
4
3
2
1
0
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A/D Data Registers
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
A/D Converter Control Registers – SADC0, SADC1, SADC2, PASR, PBSR
To control the function and operation of the A/D converter, several control registers known as
SADC0, SADC1 and SADC2 are provided. These 8-bit registers define functions such as the
selection of which analog channel is connected to the internal A/D converter, the digitised data
format, the A/D clock source as well as controlling the start function and monitoring the A/D
converter busy status. The SACS2~SACS0 bits in the SADC0 register are used to determine which
external channel input is selected to be converted. The SAINS2~SAINS0 bits in the SADC1 register
are used to determine that the analog signal to be converted comes from the internal analog signal
or external analog channel input. If the SAINS2~SAINS0 bits are set to “000”, the external analog
channel input is selected to be converted and the SACS2~SACS0 bits can determine which external
channel is selected to be converted. If the SAINS2~SAINS0 bits are set to “001~011”, the AVDD
voltage is selected to be converted. If the SAINS2~SAINS0 bits are set to “101~111”, the OPA
output voltage is selected to be converted. When VREF or VBG is selected as ADC input or ADC
reference voltage, the OPA needs to be enabled by setting ENOPA to 1.
Note that when the programs select external signal and internal signal as an ADC input signal
simultaneously, then the hardware will only choose the internal signal as an ADC input. In addition,
if the programs select external reference voltage VREF and the internal reference voltage VBG as ADC
reference voltage, then the hardware will only choose the internal reference voltage VBG as an ADC
reference voltage input.
The pin-shared function control registers, named PASR and PBSR, contain the corresponding pinshared selection bits which determine which pins on Port A and Port B are used as analog inputs
for the A/D converter input and which pins are not to be used as the A/D converter input. When
the pin is selected to be an A/D input, its original function whether it is an I/O or other pin-shared
function will be removed. In addition, any internal pull-high resistors connected to these pins will be
automatically removed if the pin is selected to be an A/D input.
Rev. 1.10
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SADC0 Register – HT66F002/HT66F003
Bit
7
6
5
4
3
2
1
0
Name
START
ADBZ
ENADC
ADRFS
—
—
SACS1
SACS0
R/W
R/W
R
R/W
R/W
—
—
R/W
R/W
POR
0
0
0
0
—
—
0
0
Bit 7
START: Start the A/D conversion
0→1→0: Start A/D conversion
0→1: Reset the A/D converter and set ADBZ to 0
1→0: Start A/D conversion and set ADBZ to 1
Bit 6ADBZ: ADC busy flag
0: A/D conversion ended or no conversion
1: A/D is busy
Bit 5
ENADC: ADC enable/disable control register
0: ADC disable
1: ADC enable
Bit 4ADRFS: A/D output data format selection bit
0: ADC output data format → SADOH=D[11:4]; SADOL=D[3:0]
1: ADC output data format → SADOH=D[11:8]; SADOL=D[7:0]
Bit 3~2
Unimplemented, read as "0"
Bit 1~0SACS1~SACS0: ADC input channels selection
00: ADC input channel comes from AN0
01: ADC input channel comes from AN1
10: ADC input channel comes from AN2
11: ADC input channel comes from AN3
SADC0 Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
START
ADBZ
ENADC
ADRFS
—
SACS2
SACS1
SACS0
R/W
R/W
R
R/W
R/W
—
R/W
R/W
R/W
POR
0
0
0
0
—
0
0
0
Bit 7START: Start the A/D conversion
0→1→0: Start A/D conversion
0→1: Reset the A/D converter and set ADBZ to 0
1→0: Start A/D conversion and set ADBZ to 1
Bit 6ADBZ: ADC busy flag
0: A/D conversion ended or no conversion
1: A/D is busy
Bit 5ENADC: ADC enable/disable control register
0: ADC disable
1: ADC enable
Bit 4ADRFS: A/D output data format selection bit
0: ADC output data format → SADOH=D[11:4]; SADOL=D[3:0]
1: ADC output data format → SADOH=D[11:8]; SADOL=D[7:0]
Bit 3~2
Unimplemented, read as “0”
Bit 1~0SACS2~SACS0: ADC input channels selection
000: ADC input channel comes from AN0
001: ADC input channel comes from AN1
010: ADC input channel comes from AN2
011: ADC input channel comes from AN3
100: ADC input channel comes from AN4
101: ADC input channel comes from AN5
110: ADC input channel comes from AN6
111: ADC input channel comes from AN7
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SADC1 Register
Bit
7
6
5
4
3
2
1
0
Name
SAINS2
SAINS1
SAINS0
—
—
SACKS2
SACKS1
SACKS0
R/W
R/W
R/W
R/W
—
—
R/W
R/W
R/W
POR
0
0
0
—
—
0
0
0
Bit 7~5SAINS2~SAINS0: Internal ADC input channel selection bit
000: ADC input only comes from external pin
001: ADC input also comes from AVDD
010: ADC input also comes from AVDD/2
011: ADC input also comes from AVDD/4
101: ADC input also comes from VR
110: ADC input also comes from VR/2
111: ADC input also comes from VR/4
Other Values: same as 000
Note: VR is OPA output voltage. VR can be one of VREF/VREF×2/VREF×3/VREF×4/VBG×2/
VBG×3/VBG×4.
Bit 4~3
Unimplemented, read as "0"
Bit 2~0SACKS2~SACKS0: ADC clock rate selection bit
000: SACLK=fSYS
001: SACLK=fSYS/2
010: SACLK=fSYS/4
011: SACLK=fSYS/8
100: SACLK=fSYS/16
101: SACLK=fSYS/32
110: SACLK=fSYS/64
111: SACLK=fSYS/128
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SADC2 Register
Bit
7
6
5
4
3
2
1
0
Name
ENOPA
VBGEN
—
—
SAVRS3
SAVRS2
SAVRS1
SAVRS0
R/W
R/W
R/W
—
—
R/W
R/W
R/W
R/W
POR
0
0
—
—
0
0
0
0
ENOPA: OPA enable/disable control register
0: OPA disable
1: OPA enable
Bit 6VBGEN: Bandgap buffer disable/enable control bit
0: Bandgap buffer disable
1: Bandgap buffer enable
Bit 5~4
Unimplemented, read as "0"
Bit 3~0SAVRS3~SAVRS0: ADC reference voltage selection bit
0000: ADC reference voltage comes from AVDD
0001: ADC reference voltage comes from VREF
0010: ADC reference voltage comes from VREF × 2
0011: ADC reference voltage comes from VREF × 3
0100: ADC reference voltage comes from VREF × 4
1001: Inhibit to use
1010: ADC reference voltage comes from VBG × 2
1011: ADC reference voltage comes from VBG × 3
1100: ADC reference voltage comes from VBG × 4
Other Values: same as 0000
Note: (1) When Select VREF or VREF×2 or VREF×3 or VREF×4 as ADC reference voltage,
HT66F002: pin share control bits (PAS3, PAS2) is (1, 0) to select VREF as input.
HT66F003: pin share control bits (PAS2, PAS1) is (1, 0) to select VREF as input.
HT66F004: pin share control bits (PAS3, PAS2) is (1, 0) to select VREF as input
(2) VBG=1.04V
(3) When SAVRS3=1, OPA selects VBG as input.
(4) If the programs select external reference voltage VREF and the internal
reference voltage VBG as ADC reference voltage, then the hardware will only
choose the internal reference voltage VBG as an ADC reference voltage input.
Bit 7
A/D Operation
The START bit is used to start and reset the A/D converter. When the microcontroller sets this bit
from low to high and then low again, an analog to digital conversion cycle will be initiated. When
the START bit is brought from low to high but not low again, the ADBZ bit in the SADC0 register
will be cleared to zero and the analog to digital converter will be reset. It is the START bit that is
used to control the overall start operation of the internal analog to digital converter.
The ADBZ bit in the SADC0 register is used to indicate whether the analog to digital conversion
process is in process or not. When the A/D converter is reset by setting the START bit from
low to high, the ADBZ flag will be cleared to 0. This bit will be automatically set to “1” by the
microcontroller after an A/D conversion is successfully initiated. When the A/D conversion is
complete, the ADBZ will be cleared to 0. In addition, the corresponding A/D interrupt request flag
will be set in the interrupt control register, and if the interrupts are enabled, an appropriate internal
interrupt signal will be generated. This A/D internal interrupt signal will direct the program flow to
the associated A/D internal interrupt address for processing. If the A/D internal interrupt is disabled,
the microcontroller can be used to poll the ADBZ bit in the SADC0 register to check whether it has
been cleared as an alternative method of detecting the end of an A/D conversion cycle.
Rev. 1.10
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HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Although the A/D clock source is determined by the system clock fSYS, and by bits SACK2~SACK0,
there are some limitations on the maximum A/D clock source speed that can be selected. As the
recommended value of permissible A/D clock period, tADCK, is from 0.5μs to 10μs, care must be
taken for system clock frequencies. For example, if the system clock operates at a frequency of
4MHz, the SACK2~SACK0 bits should not be set to 000B or 11xB. Doing so will give A/D clock
periods that are less than the minimum A/D clock period or greater than the maximum A/D clock
period which may result in inaccurate A/D conversion values. Controlling the power on/off function of the A/D converter circuitry is implemented using the
ENADC bit in the SADC0 register. This bit must be set high to power on the A/D converter. When
the ENADC bit is set high to power on the A/D converter internal circuitry a certain delay, as
indicated in the timing diagram, must be allowed before an A/D conversion is initiated. Even if no
pins are selected for use as A/D inputs by configuring the corresponding pin-shared control bits, if
the ENADC bit is high then some power will still be consumed. In power conscious applications it
is therefore recommended that the ENADC is set low to reduce power consumption when the A/D
converter function is not being used.
The reference voltage supply to the A/D Converter can be supplied from either the internal ADC power
or from an external reference sources supplied on pin VREF or VBG voltage. The desired selection is
made using the SAVRS3~ SAVRS0 bits. As the VREF pin is pin-shared with other functions, when the
VREF pin is selected as the reference voltage supply pin, the VREF pin-shared function control bits
should be properly configured to disable other pin functions. When VREF or VBG is selected by ADC
input or ADC reference voltage, the OPA needs to be enabled by setting ENOPA=1.
Reference
SAVRS[3:0]
Description
AVDD
0000
ADC Reference Voltage comes from AVDD
VREF
0001
ADC Reference Voltage comes from External VREF
VREF×2
0010
ADC Reference Voltage comes from External VREF×2
VREF×3
0011
ADC Reference Voltage comes from External VREF×3
VREF×4
0100
ADC Reference Voltage comes from External VREF×4
VBG×2
1010
ADC Reference Voltage comes from VBG×2
VBG×3
1011
ADC Reference Voltage comes from VBG×3
VBG×4
1100
ADC Reference Voltage comes from VBG×4
A/D Converter Reference Voltage Selection
A/D Converter Input Signal
All of the A/D analog input pins are pin-shared with the I/O pins on Port A and Port B as well as
other functions. The corredponding selection bits for each I/O pin in the PASR and PBSR registers,
determine whether the input pins are setup as A/D converter analog inputs or whether they have
other functions. If the pin-shared function control bits configure its corresponding pin as an A/D
analog channel input, the pin will be setup to be an A/D converter external channel input and the
original pin functions disabled. In this way, pins can be changed under program control to change
their function between A/D inputs and other functions. All pull-high resistors, which are setup
through register programming, will be automatically disconnected if the pins are setup as A/D
inputs. Note that it is not necessary to first setup the A/D pin as an input in the PAC and PBC port
control register to enable the A/D input as when the pin-shared function control bits enable an A/D
input, the status of the port control register will be overridden.
The A/D converter has its own reference voltage pin, VREF, however the reference voltage can
also be supplied from the power supply pin, a choice which is made through the SAVRS[3:0] in the
SADC2 register. The analog input values must not be allowed to exceed the value of VREF.
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Conversion Rate and Timing Diagram
A complete A/D conversion contains two parts, data sampling and data conversion. The data
sampling which is defined as tADS takes 4 A/D clock cycles and the data conversion takes 12 A/D
clock cycles. Therefore a total of 16 A/D clock cycles for an A/D conversion which is defined as tADC
are necessary.
Maximum single A/D conversion rate = A/D clock period / 16 However, there is a usage limitation on the next A/D conversion after the current conversion is
complete. When the current A/D conversion is complete, the converted digital data will be stored
in the A/D data register pair and then latched after half an A/D clock cycle. If the START bit is set
to 1 in half an A/D clock cycle after the end of A/D conversion, the converted digital data stored
in the A/D data register pair will be changed. Therefore, it is recommended to initiate the next A/D
conversion after a certain period greater than half an A/D clock cycle
at the end of current A/D
conversion.

          ­   € ­    ‚ 
A/D Conversion Timing
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Summary of A/D Conversion Steps
The following summarises the individual steps that should be executed in order to implement an A/
D conversion process.
• Step 1
Select the required A/D conversion frequency by SACKS2~ SACKS0
• Step 2
Enable the ADC by set ENADC=1
• Step 3
Select which pins will be configure as ADC analog inputs
• Step 4
If input comes from I/O, set SAINS[2:0]=000 and then set SACS bit fields to corresponding PAD
input
If input comes from internal input, set SAINS[2:0] to corresponding internal input source
• Step 5
Select reference voltage comes from external VREF, AVDD or VBG by SAVRS[3:0]
Note: (1) If select VREF as reference voltage, (PAS3, PAS2) = (1, 0) for HT66F002/HT66F004
(2) If select VREF as reference voltage, (PAS2, PAS1) = (1, 0) for HT66F003
• Step 6
Select ADC output data format by ADRFS
• Step 7
If ADC interrupt is used, the interrupt control registers must be correctly configured to ensure
the A/D interrupt function is active. The master interrupt control bit, EMI, and the A/D converter
interrupt bits, ADE, must both set high in advance.
• Step 8
The A/D convert procedure can now be initialized by set START from low to high and then low
again
• Step 9
If ADC is under conversion, ADBZ=1. After A/D conversion process is completed, the ADBZ
flag will go low, and then output data can be read from SADOH and SADOL registers. If the
ADC interrupt is enabled and the stack is not full, data can be acquired by interrupt service
program. Another way to get the A/D output data is polling the ADBZ flag.
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Programming Considerations
During microcontroller operations where the A/D converter is not being used, the A/D internal
circuitry can be switched off to reduce power consumption, by clearing the ENADC bit in the
SADC0 register. When this happens, the internal A/D converter circuits will not consume power
irrespective of what analog voltage is applied to their input lines. If the A/D converter input lines are
used as normal I/Os, then care must be taken as if the input voltage is not at a valid logic level, then
this may lead to some increase in power consumption.
A/D Transfer Function
As the devices contain a 12-bit A/D converter, its full-scale converted digitised value is equal to
FFFH. Since the full-scale analog input value is equal to the VDD or VREF voltage, this gives a single
bit analog input value of VDD or VREF divided by 4096.
1 LSB= (AVDD or VREF) / 4096
The A/D Converter input voltage value can be calculated using the following equation:
A/D input voltage = A/D output digital value × (AVDD or VREF) / 4096
The diagram shows the ideal transfer function between the analog input value and the digitised
output value for the A/D converter. Except for the digitised zero value, the subsequent digitised
values will change at a point 0.5 LSB below where they would change without the offset, and the
last full scale digitised value will change at a point 1.5 LSB below the VDD or VREF level.
    
 
      Ideal A/D Transfer Function
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A/D Programming Examples
The following two programming examples illustrate how to setup and implement an A/D conversion.
In the first example, the method of polling the ADBZ bit in the SADC0 register is used to detect
when the conversion cycle is complete, whereas in the second example, the A/D interrupt is used to
determine when the conversion is complete.
Example: using an EOCB polling method to detect the end of conversion
clr ADE
; disable ADC interrupt
mova,0BH
mov SADC1,a ; select fSYS/8 as A/D clock and switch off the bandgap reference voltage
set ENADC
mova,03h ; setup PASR to configure pin AN0
mov PASR,a
mova,20h
mov SADC0,a ; enable and connect AN0 channel to A/D converter
:
start_conversion:
clr START ; high pulse on start bit to initiate conversion
set START ; reset A/D
clr START ; start A/D
polling_EOC:
sz ADBZ ; poll the SADC0 register ADBZ bit to detect end of A/D conversion
jmp polling_EOC ; continue polling
mova,SADOL ; read low byte conversion result value
mov SADOL_buffer,a
; save result to user defined register
mova,SADOH ; read high byte conversion result value
mov SADOH_buffer,a ; save result to user defined register
:
:
jmp start_conversion ; start next a/d conversion
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Example: using the interrupt method to detect the end of conversion
clr ADE ; disable ADC interrupt
mova,0BH
mov SADC1,a ; select fSYS/8 as A/D clock and switch off the bandgap reference voltage
set ENADC
mova,03h ; setup PASR to configure pin AN0
mov PASR,a
mova,20h
mov SADC0,a ; enable and connect AN0 channel to A/D converter
Start_conversion:
clr START ; high pulse on START bit to initiate conversion
set START ; reset A/D
clr START ; start A/D
clrADF ; clear ADC interrupt request flag
set ADE ; enable ADC interrupt
set EMI ; enable global interrupt
:
:
; ADC interrupt service routine
ADC_ISR:
mov acc_stack,a ; save ACC to user defined memory
mov a,STATUS
mov status_stack,a ; save STATUS to user defined memory
:
:
mova,SADOL ; read low byte conversion result value
mov SADOL_buffer,a ; save result to user defined register
mova,SADOH ; read high byte conversion result value
mov SADOH_buffer,a ; save result to user defined register
:
:
EXIT_INT_ISR:
mov a,status_stack
mov STATUS,a ; restore STATUS from user defined memory
mov a,acc_stack ; restore ACC from user defined memory
reti
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Interrupts
Interrupts are an important part of any microcontroller system. When an external event or an
internal function such as a Timer Module or an A/D converter requires microcontroller attention,
their corresponding interrupt will enforce a temporary suspension of the main program allowing the
microcontroller to direct attention to their respective needs. The devices contain several external
interrupts and internal interrupts functions. The external interrupts are generated by the action of
the external INT0~INT1 and INT pin, while the internal interrupts are generated by various internal
functions such as the TMs, Time Base, EEPROM and the A/D converter.
Interrupt Registers
Overall interrupt control, which basically means the setting of request flags when certain
microcontroller conditions occur and the setting of interrupt enable bits by the application program,
is controlled by a series of registers, located in the Special Purpose Data Memory, as shown in the
accompanying table. The number of registers depends upon the device chosen but fall into three
categories. The first is the INTC0~INTC1 registers which setup the primary interrupts, the second
is the MFI0~MFI1 registers which setup the Multi-function interrupts. Finally there is an INTEG
register to setup the external interrupt trigger edge type.
Each register contains a number of enable bits to enable or disable individual registers as well as
interrupt flags to indicate the presence of an interrupt request. The naming convention of these
follows a specific pattern. First is listed an abbreviated interrupt type, then the (optional) number of
that interrupt followed by either an “E” for enable/disable bit or “F” for request flag.
Function
Enable Bit
Request Flag
Notes
Global
EMI
—
—
INT Pin
INTE
INTF
—
—
A/D Converter
ADE
ADF
Multi-function
MF0E
MF0F
—
Time Base
TBnE
TBnF
n=0 or 1
—
EEPROM
TM
DEE
DEF
STMA0E
STMA0F
STMP0E
STMP0F
—
Interrupt Register Bit Naming Conventions – HT66F002
Function
Enable Bit
Request Flag
Notes
Global
EMI
—
—
INT Pin
INTE
INTF
—
A/D Converter
ADE
ADF
—
Multi-function
MFnE
MFnF
n=0 or 1
Time Base
TBnE
TBnF
n=0 or 1
—
EEPROM
TM
DEE
DEF
STMA0E
STMA0F
STMP0E
STMP0F
PTMA1E
PTMA1F
PTMP1E
PTMP1F
—
Interrupt Register Bit Naming Conventions – HT66F003
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Function
Enable Bit
Request Flag
Global
EMI
—
Notes
—
INTn Pin
INTnE
INTnF
n=0 or 1
—
A/D Converter
ADE
ADF
Multi-function
MF0E
MF0F
—
Time Base
TBnE
TBnF
n=0 or 1
EEPROM
DEE
DEF
—
TM
PTMAnE
PTMAnF
PTMPnE
PTMPnF
n=0 or 1
Interrupt Register Bit Naming Conventions – HT66F004
Interrupt Register Contents
• HT66F002
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
INTEG
—
—
—
—
—
—
INT0S1
INT0S0
INTC0
—
TB1F
TB0F
INTF
TB1E
TB0E
INTE
EMI
INTC1
—
ADF
DEF
MF0F
—
ADE
DEE
MF0E
MFI0
—
—
STMA0F
STMP0F
—
—
STMA0E
STMP0E
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
INTEG
—
—
—
—
—
—
INT0S1
INT0S0
INTC0
—
TB1F
TB0F
INTF
TB1E
TB0E
INTE
EMI
INTC1
MF1F
ADF
DEF
MF0F
MF1E
ADE
DEE
MF0E
• HT66F003
MFI0
—
—
STMA0F
STMP0F
—
—
STMA0E
STMP0E
MFI1
—
—
PTMA1F
PTMP1F
—
—
PTMA1E
PTMP1E
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
INTEG
—
—
—
—
INT1S1
INT1S0
INT0S1
INT0S0
INTC0
—
TB1F
TB0F
INT0F
TB1E
TB0E
INT0E
EMI
INTC1
INT1F
ADF
DEF
MF0F
INT1E
ADE
DEE
MF0E
MFI0
PTMA1F
PTMP1F
PTMA0F
PTMP0F
PTMA1E
PTMP1E
PTMA0E
PTMP0E
• HT66F004
INTEG Register – HT66F002/HT66F003
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
INT0S1
INT0S0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
Bit 7 ~ 2 Unimplemented, read as "0"
Bit 1 ~ 0
INT0S1, INT0S0: Defines INT interrupt active edge
00: Disable Interrupt
01: Rising Edge Interrupt
10: Falling Edge Interrupt
11: Dual Edge Interrupt
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INTEG Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
INT1S1
INT1S0
INT0S1
INT0S0
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
0
0
0
Bit 7 ~ 4 Unimplemented, read as “0”
Bit 3 ~ 2
INT1S1, INT1S0: Defines INT1 interrupt active edge
00: Disable Interrupt
01: Rising Edge Interrupt
10: Falling Edge Interrupt
11: Dual Edge Interrupt
Bit 1 ~ 0
INT0S1, INT0S0: Defines INT0 interrupt active edge
00: Disable Interrupt
01: Rising Edge Interrupt
10: Falling Edge Interrupt
11: Dual Edge Interrupt
INTC0 Register – HT66F002/HT66F003
Bit
7
6
5
4
3
2
1
0
Name
—
TB1F
TB0F
INTF
TB1E
TB0E
INTE
EMI
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit 7
Unimplemented, read as "0"
Bit 6
TB1F : Time Base 1 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 5
TB0F: Time Base 0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 4
INTF: INT Interrupt Request Flag
0: No request
1: Interrupt request
Bit 3 TB1E : Time Base 1 Interrupt Control
0: Disable
1: Enable
Bit 2TB0E: Time Base 0 Interrupt Control
0: Disable
1: Enable
Bit 1INTE: INT Interrupt Control
0: Disable
1: Enable
Bit 0
Rev. 1.10
EMI: Global Interrupt Control
0: Disable
1: Enable
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INTC0 Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
—
TB1F
TB0F
INT0F
TB1E
TB0E
INT0E
EMI
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit 7
Unimplemented, read as “0”
Bit 6TB1F: Time Base 1 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 5TB0F: Time Base 0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 4INT0F: INT0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 3 TB1E : Time Base 1 Interrupt Control
0: Disable
1: Enable
Bit 2TB0E: Time Base 0 Interrupt Control
0: Disable
1: Enable
Bit 1INT0E: INT0 Interrupt Control
0: Disable
1: Enable
Bit 0EMI: Global Interrupt Control
0: Disable
1: Enable
INTC1 Register – HT66F002
Bit
7
6
5
4
3
2
1
0
Name
—
ADF
DEF
MF0F
—
ADE
DEE
MF0E
R/W
—
R/W
R/W
R/W
—
R/W
R/W
R/W
POR
—
0
0
0
—
0
0
0
Bit 7
Bit 6
Unimplemented, read as "0"
ADF: A/D Converter Interrupt Request Flag
0: No request
1: Interrupt request
Bit 5
DEF: Data EEPROM Interrupt Request Flag
0: No request
1: Interrupt request
Bit 4MF0F: Multi-function 0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 3 Unimplemented, read as "0"
Bit 2ADE: A/D Converter Interrupt Control
0: Disable
1: Enable
Bit 1DEE: Data EEPROM Interrupt Control
0: Disable
1: Enable
Bit 0
MF0E: Multi-function 0 Interrupt Control
0: Disable
1: Enable
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INTC1 Register – HT66F003
Bit
7
6
5
4
3
2
1
0
Name
MF1F
ADF
DEF
MF0F
MF1E
ADE
DEE
MF0E
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7MF1F: Multi-function 1 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 6
ADF: A/D Converter Interrupt Request Flag
0: No request
1: Interrupt request
Bit 5
DEF: Data EEPROM Interrupt Request Flag
0: No request
1: Interrupt request
Bit 4MF0F: Multi-function 0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 3 MF1E: Multi-function 1 Interrupt Control
0: Disable
1: Enable
Bit 2ADE: A/D Converter Interrupt Control
0: Disable
1: Enable
Bit 1DEE: Data EEPROM Interrupt Control
0: Disable
1: Enable
Bit 0
MF0E: Multi-function 0 Interrupt Control
0: Disable
1: Enable
INTC1 Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
INT1F
ADF
DEF
MF0F
INT1E
ADE
DEE
MF0E
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7INT1F: INT1 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 6ADF: A/D Converter Interrupt Request Flag
0: No request
1: Interrupt request
Bit 5DEF: Data EEPROM Interrupt Request Flag
0: No request
1: Interrupt request
Bit 4MF0F: Multi-function 0 Interrupt Request Flag
0: No request
1: Interrupt request
Bit 3 INT1E: INT1 Interrupt Control
0: Disable
1: Enable
Bit 2ADE: A/D Converter Interrupt Control
0: Disable
1: Enable
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Bit 1DEE: Data EEPROM Interrupt Control
0: Disable
1: Enable
Bit 0MF0E: Multi-function 0 Interrupt Control
0: Disable
1: Enable
MFI0 Register – HT66F002/HT66F003
Bit
7
6
5
4
3
2
1
0
Name
—
—
STMA0F
STMP0F
—
—
STMA0E
STMP0E
R/W
—
—
R/W
R/W
—
—
R/W
R/W
POR
—
—
0
0
—
—
0
0
Bit 7 ~ 6
Unimplemented, read as "0"
Bit 5STMA0F: STM Comparator A match interrupt request flag
0: No request
1: Interrupt request
Bit 4
STMP0F: STM Comparator P match interrupt request flag
0: No request
1: Interrupt request
Bit 3 ~ 2
Unimplemented, read as "0"
Bit 1STMA0E: STM Comparator A match interrupt control
0: Disable
1: Enable
Bit 0STMP0E: STM Comparator P match interrupt control
0: Disable
1: Enable
MFI0 Register – HT66F004
Bit
7
6
5
4
3
2
1
0
Name
PTMA1F
PTMP1F
PTMA0F
PTMP0F
PTMA1E
PTMP1E
PTMA0E
PTMP0E
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7PTMA1F: TM1 Comparator A match interrupt request flag
0: No request
1: Interrupt request
Bit 6PTMP1F: TM1 Comparator P match interrupt request flag
0: No request
1: Interrupt request
Bit 5PTMA0F: TM0 Comparator A match interrupt request flag
0: No request
1: Interrupt request
Bit 4PTMP0F: TM0 Comparator P match interrupt request flag
0: No request
1: Interrupt request
Bit 3PTMA1E: TM1 Comparator A match interrupt control
0: Disable
1: Enable
Bit 2PTMP1E: TM1 Comparator P match interrupt control
0: Disable
1: Enable
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Bit 1PTMA0E: TM0 Comparator A match interrupt control
0: Disable
1: Enable
Bit 0PTMP0E: TM0 Comparator P match interrupt control
0: Disable
1: Enable
MFI1 Register – HT66F003 only
Bit
7
6
5
4
3
2
1
0
Name
—
—
PTMA1F
PTMP1F
—
—
PTMA1E
PTMP1E
R/W
—
—
R/W
R/W
—
—
R/W
R/W
POR
—
—
0
0
—
—
0
0
Bit 7 ~ 6
Unimplemented, read as "0"
Bit 5
PTMA1F: PTM Comparator A match interrupt request flag
0: No request
1: Interrupt request
Bit 4
PTMP1F: PTM Comparator P match interrupt request flag
0: No request
1: Interrupt request
Bit 3 ~ 2 Unimplemented, read as "0"
Bit 1PTMA1E: PTM Comparator A match interrupt control
0: Disable
1: Enable
Bit 0PTMP1E: PTM Comparator P match interrupt control
0: Disable
1: Enable
Interrupt Operation
When the conditions for an interrupt event occur, such as a TM Comparator P or Comparator A
match or A/D conversion completion etc, the relevant interrupt request flag will be set. Whether
the request flag actually generates a program jump to the relevant interrupt vector is determined by
the condition of the interrupt enable bit. If the enable bit is set high then the program will jump to
its relevant vector; if the enable bit is zero then although the interrupt request flag is set an actual
interrupt will not be generated and the program will not jump to the relevant interrupt vector. The
global interrupt enable bit, if cleared to zero, will disable all interrupts.
When an interrupt is generated, the Program Counter, which stores the address of the next instruction
to be executed, will be transferred onto the stack. The Program Counter will then be loaded with a
new address which will be the value of the corresponding interrupt vector. The microcontroller will
then fetch its next instruction from this interrupt vector. The instruction at this vector will usually
be a “JMP” which will jump to another section of program which is known as the interrupt service
routine. Here is located the code to control the appropriate interrupt. The interrupt service routine
must be terminated with a “RETI”, which retrieves the original Program Counter address from
the stack and allows the microcontroller to continue with normal execution at the point where the
interrupt occurred.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
The various interrupt enable bits, together with their associated request flags, are shown in the
accompanying diagrams with their order of priority. Some interrupt sources have their own
individual vector while others share the same multi-function interrupt vector. Once an interrupt
subroutine is serviced, all the other interrupts will be blocked, as the global interrupt enable bit,
EMI bit will be cleared automatically. This will prevent any further interrupt nesting from occurring.
However, if other interrupt requests occur during this interval, although the interrupt will not be
immediately serviced, the request flag will still be recorded.
If an interrupt requires immediate servicing while the program is already in another interrupt service
routine, the EMI bit should be set after entering the routine, to allow interrupt nesting. If the stack
is full, the interrupt request will not be acknowledged, even if the related interrupt is enabled, until
the Stack Pointer is decremented. If immediate service is desired, the stack must be prevented from
becoming full. In case of simultaneous requests, the accompanying diagram shows the priority that
is applied. All of the interrupt request flags when set will wake-up the device if it is in SLEEP or
IDLE Mode, however to prevent a wake-up from occurring the corresponding flag should be set
before the device is in SLEEP or IDLE Mode.
EMI auto disabled in ISR
Legend
xxF
Request Flag, no auto reset in ISR
xxF
Request Flag, auto reset in ISR
xxE
Enable Bits
Interrupt
Name
Request
Flags
Enable
Bits
STM P
STMP0F
STMP0E
STM A
STMA0F
STMA0E
PTM P
PTMP1F
PTMP1E
PTM A
PTMA1F
PTMA1E
Interrupt
Name
Request
Flags
Enable
Bits
Master
Enable
Vector
INT Pin
INTF
INTE
EMI
04H
Time Base 0
TB0F
TB0E
EMI
08H
Time Base 1
TB1F
TB1E
EMI
0CH
M. Funct. 0
MF0F
MF0E
EMI
10H
EEPROM
DEF
DEE
EMI
14H
A/D
ADF
ADE
EMI
18H
M. Funct. 1
MF1F
MF1E
EMI
1CH
Priority
High
Low
Interrupts contained within
Multi-Function Interrupts
HT66F003 only
Interrupt Structure – HT66F002/HT66F003
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EMI auto disabled in ISR
Legend
xxF
Request Flag, no auto reset in ISR
xxF
Request Flag, auto reset in ISR
xxE
Enable Bits
Interrupt
Name
Request
Flags
Enable
Bits
Master
Enable
Vector
INT0 Pin
INT0F
INT0E
EMI
04H
Time Base 0
TB0F
TB0E
EMI
08H
Time Base 1
TB1F
TB1E
EMI
0CH
Interrupt
Name
Request
Flags
Enable
Bits
PTM0 P
PTMP0F
PTMP0E
PTM0 A
PTMA0F
PTMA0E
M. Funct. 0
MF0F
MF0E
EMI
10H
PTM1 P
PTMP1F
PTMP1E
EEPROM
DEF
DEE
EMI
14H
PTM1 A
PTMA1F
PTMA1E
A/D
ADF
ADE
EMI
18H
INT1 Pin
INT1F
INT1E
EMI
1CH
Interrupts contained within
Multi-Function Interrupts
Priority
High
Low
Interrupt Structure – HT66F004
External Interrupt
The external interrupt is controlled by signal transitions on the pins INT and INT0~INT1. An
external interrupt request will take place when the external interrupt request flag, INTnF, is set,
which will occur when a transition, whose type is chosen by the edge select bits, appears on the
external interrupt pin. To allow the program to branch to the interrupt vector address, the global
interrupt enable bit, EMI, and the external interrupt enable bit, INTnE, must first be set. Additionally
the correct interrupt edge type must be selected using the INTEG register to enable the external
interrupt function and to choose the trigger edge type. As the external interrupt pins are pin-shared
with I/O pins, they can only be configured as external interrupt pins by setting the pin-shared
registers. The pin must also be setup as an input by setting the corresponding bit in the port control
register. When the interrupt is enabled, the stack is not full and the correct transition type appears
on the external interrupt pin, a subroutine call to the external interrupt vector, will take place. When
the interrupt is serviced, the external interrupt request flag, INTnF, will be automatically reset
and the EMI bit will be automatically cleared to disable other interrupts. Note that the pull-high
resistor selection on the external interrupt pin will remain valid even if the pin is used as an external
interrupt input.
The INTEG register is used to select the type of active edge that will trigger the external interrupt.
A choice of either rising or falling or both edge types can be chosen to trigger an external interrupt.
Note that the INTEG register can also be used to disable the external interrupt function.
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Multi-function Interrupt
Within these devices there are up to two Multi-function interrupts. Unlike the other independent
interrupts, these interrupts have no independent source, but rather are formed from other existing
interrupt sources, namely the TM Interrupts.
A Multi-function interrupt request will take place when any of the Multi-function interrupt request
flags, MF0F~MF1F are set. The Multi-function interrupt flags will be set when any of their included
functions generate an interrupt request flag. To allow the program to branch to its respective interrupt
vector address, when the Multi-function interrupt is enabled and the stack is not full, and either one
of the interrupts contained within each of Multi-function interrupt occurs, a subroutine call to one of
the Multi-function interrupt vectors will take place. When the interrupt is serviced, the related MultiFunction request flag, will be automatically reset and the EMI bit will be automatically cleared to
disable other interrupts.
However, it must be noted that, although the Multi-function Interrupt flags will be automatically
reset when the interrupt is serviced, the request flags from the original source of the Multi-function
interrupts, namely the TM Interrupts, will not be automatically reset and must be manually reset by
the application program.
A/D Converter Interrupt
The devices contain an A/D converter which has its own independent interrupt. The A/D Converter
Interrupt is controlled by the termination of an A/D conversion process. An A/D Converter Interrupt
request will take place when the A/D Converter Interrupt request flag, ADF, is set, which occurs
when the A/D conversion process finishes. To allow the program to branch to its respective interrupt
vector address, the global interrupt enable bit, EMI, and A/D Interrupt enable bit, ADE, must first be
set. When the interrupt is enabled, the stack is not full and the A/D conversion process has ended, a
subroutine call to the A/D Converter Interrupt vector, will take place. When the interrupt is serviced,
the A/D Converter Interrupt flag, ADF, will be automatically cleared. The EMI bit will also be
automatically cleared to disable other interrupts.
Time Base Interrupts
The function of the Time Base Interrupts is to provide regular time signal in the form of an internal
interrupt. They are controlled by the overflow signals from their respective timer functions. When
these happens their respective interrupt request flags, TB0F or TB1F will be set. To allow the
program to branch to their respective interrupt vector addresses, the global interrupt enable bit, EMI
and Time Base enable bits, TB0E or TB1E, must first be set. When the interrupt is enabled, the stack
is not full and the Time Base overflows, a subroutine call to their respective vector locations will
take place. When the interrupt is serviced, the respective interrupt request flag, TB0F or TB1F, will
be automatically reset and the EMI bit will be cleared to disable other interrupts.
The purpose of the Time Base Interrupt is to provide an interrupt signal at fixed time periods. Their
clock sources originate from the internal clock source fTB. This fTB input clock passes through a
divider, the division ratio of which is selected by programming the appropriate bits in the TBC
register to obtain longer interrupt periods whose value ranges. The clock source that generates fTB,
which in turn controls the Time Base interrupt period, can originate from several different sources,
as shown in the System Operating Mode section.
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TBC Register
Bit
7
6
5
4
3
2
1
0
Name
TBON
TBCK
TB11
TB10
—
TB02
TB01
TB00
R/W
R/W
R/W
R/W
R/W
—
R/W
R/W
R/W
POR
0
0
1
1
—
1
1
1
Bit 7TBON: TB0 and TB1 Control bit
0: Disable
1: Enable
Bit 6TBCK: Select fTB Clock
0: fTBC
1: fSYS/4
Bit 5 ~ 4
TB11 ~ TB10: Select Time Base 1 Time-out Period
00: 4096/fTB
01: 8192/fTB
10: 16384/fTB
11: 32768/fTB
Bit 3
Unimplemented, read as "0"
Bit 2 ~ 0
TB02 ~ TB00: Select Time Base 0 Time-out Period
000: 256/fTB
001: 512/fTB
010: 1024/fTB
011: 2048/fTB
100: 4096/fTB
101: 8192/fTB
110: 16384/fTB
111: 32768/fTB
 Time Base Interrupt
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
EEPROM Interrupt
An EEPROM Interrupt request will take place when the EEPROM Interrupt request flag, DEF, is set,
which occurs when an EEPROM Write cycle ends. To allow the program to branch to its respective
interrupt vector address, the global interrupt enable bit, EMI, and EEPROM Interrupt enable bit,
DEE, must first be set. When the interrupt is enabled, the stack is not full and an EEPROM Write
cycle ends, a subroutine call to the respective EEPROM Interrupt vector, will take place. When the
EEPROM Interrupt is serviced, the EMI bit will be automatically cleared to disable other interrupts,
and the EEPROM interrupt request flag, DEF, will also be automatically cleared.
TM Interrupts
The TMs each has two interrupts. All of the TM interrupts are contained within the Multi-function
Interrupts. For each of the TMs there are two interrupt request flags xTMPnF and xTMAnF and
two enable bits xTMPnE and xTMAnE. A TM interrupt request will take place when any of the
TM request flags are set, a situation which occurs when a TM comparator P or comparator A match
situation happens.
To allow the program to branch to its respective interrupt vector address, the global interrupt enable
bit, EMI, and the respective TM Interrupt enable bit, and associated Multi-function interrupt enable
bit, MFnF, must first be set. When the interrupt is enabled, the stack is not full and a TM comparator
match situation occurs, a subroutine call to the relevant TM Interrupt vector locations, will take
place. When the TM interrupt is serviced, the EMI bit will be automatically cleared to disable other
interrupts, however only the related MFnF flag will be automatically cleared. As the TM interrupt
request flags will not be automatically cleared, they have to be cleared by the application program.
Interrupt Wake-up Function
Each of the interrupt functions has the capability of waking up the microcontroller when in the
SLEEP or IDLE Mode. A wake-up is generated when an interrupt request flag changes from low to
high and is independent of whether the interrupt is enabled or not. Therefore, even though the device
is in the SLEEP or IDLE Mode and its system oscillator stopped, situations such as external edge
transitions on the external interrupt pin, a low power supply voltage or comparator input change may
cause their respective interrupt flag to be set high and consequently generate an interrupt. Care must
therefore be taken if spurious wake-up situations are to be avoided. If an interrupt wake-up function
is to be disabled then the corresponding interrupt request flag should be set high before the device
enters the SLEEP or IDLE Mode. The interrupt enable bits have no effect on the interrupt wake-up
function.
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Programming Considerations
By disabling the relevant interrupt enable bits, a requested interrupt can be prevented from being
serviced, however, once an interrupt request flag is set, it will remain in this condition in the
interrupt register until the corresponding interrupt is serviced or until the request flag is cleared by
the application program.
Where a certain interrupt is contained within a Multi-function interrupt, then when the interrupt
service routine is executed, as only the Multi-function interrupt request flags, MF0F~MF1F, will
be automatically cleared, the individual request flag for the function needs to be cleared by the
application program.
It is recommended that programs do not use the “CALL” instruction within the interrupt service
subroutine. Interrupts often occur in an unpredictable manner or need to be serviced immediately.
If only one stack is left and the interrupt is not well controlled, the original control sequence will be
damaged once a CALL subroutine is executed in the interrupt subroutine.
Every interrupt has the capability of waking up the microcontroller when it is in SLEEP or IDLE
Mode, the wake up being generated when the interrupt request flag changes from low to high. If it is
required to prevent a certain interrupt from waking up the microcontroller then its respective request
flag should be first set high before enter SLEEP or IDLE Mode.
As only the Program Counter is pushed onto the stack, then when the interrupt is serviced, if the
contents of the accumulator, status register or other registers are altered by the interrupt service
program, their contents should be saved to the memory at the beginning of the interrupt service
routine.
To return from an interrupt subroutine, either a RET or RETI instruction may be executed. The RETI
instruction in addition to executing a return to the main program also automatically sets the EMI
bit high to allow further interrupts. The RET instruction however only executes a return to the main
program leaving the EMI bit in its present zero state and therefore disabling the execution of further
interrupts.
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SCOM Function for LCD
The HT66F004 device has the capability of driving external LCD panels. The common pins for
LCD driving, SCOM0~SCOM3, are pin shared with certain pin on the I/O ports. The LCD signals
are generated using the application program.
LCD operation
An external LCD panel can be driven using this device by configuring the I/O pins as common pins.
The LCD driver function is controlled using the SCOMC register which in addition to controlling
the overall on/off function also controls the bias voltage setup function. This enables the LCD COM
driver to generate the necessary VDD/2 voltage levels for LCD 1/2 bias operation.
The SCOMEN bit in the SCOMC register is the overall master control for the LCD driver. The
LCD SCOMn pin is selected to be used for LCD driving by the corresponding pin-shared function
selection bits. Note that the Port Control register does not need to first setup the pins as outputs to
enable the LCD driver operation.

LCD COM Bias
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LCD Bias Current Control
The LCD COM driver enables a range of selections to be provided to suit the requirement of the
LCD panel which are being used. The bias resistor choice is implemented using the ISEL1 and
ISEL0 bits in the SCOMC register.
SCOMC
Bit
7
6
5
Name
—
ISEL1
ISEL0
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit 7
4
3
2
1
0
SCOMEN COM3EN COM2EN COM1EN COM0EN
Unimplemented, read as “0”
Bit 6~5ISEL1~ISEL0: Select resistor for R type LCD bias current(VDD=5V)
00: 2×100kΩ (1/2 Bias), IBIAS = 25μA
01: 2×50 kΩ (1/2 Bias), IBIAS = 50μA
10: 2×25 kΩ (1/2 Bias), IBIAS = 100μA
11: 2×12.5 kΩ (1/2 Bias), IBIAS = 200μA
Bit 4SCOMEN: LCD control bit
0: Disable
1: Enable
When SCOMEN is set, it will turn on the DC path of resistor to generate 1/2 VDD bias
voltage.
Bit 3COM3EN: PB3/AN7 or SCOM3 selection
0: PB3/AN7
1: SCOM3
Bit 2COM2EN: PB4/CLO or SCOM2 selection
0: PB4/CLO
1: SCOM2
Bit 1COM1EN: PC1 or SCOM1 selection
0: PC1
1: SCOM1
Bit 0COM0EN: PC0 or SCOM0 selection
0: PC0
1: SCOM0
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Application Circuits
V
D D
0 .0 1 F * *
V D D
1 N 4 1 4 8 *
R e s e t
C ir c u it
1 0 k ~
1 0 0 k 0 .1 F
3 0 0 *
R E S
A N 0 ~ A N 3
P A 0 ~ P A 7
0 .1 ~ 1 F
V S S
HT66F002
V
D D
0 .0 1 F * *
V D D
1 N 4 1 4 8 *
R e s e t
C ir c u it
1 0 k ~
1 0 0 k 0 .1 F
3 0 0 *
R E S
0 .1 ~ 1 F
A N 0 ~ A N 3
P A 0 ~ P A 7
P B 0 ~ P B 5
V S S
HT66F003
V
D D
0 .0 1 F * *
V D D
1 N 4 1 4 8 *
R e s e t
C ir c u it
1 0 k ~
1 0 0 k 0 .1 F
3 0 0 *
R E S
0 .1 ~ 1 F
A N
P A
P B
P C
0 ~
0 ~
0 ~
0 ~
A N
P A
P B
P C
8
6
7
2
V S S
HT66F004
Note: "*" Recommended component for added ESD protection.
"**" Recommended component in environments where power line noise is significant.
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Instruction Set
Introduction
Central to the successful operation of any microcontroller is its instruction set, which is a set of
program instruction codes that directs the microcontroller to perform certain operations. In the case
of Holtek microcontroller, a comprehensive and flexible set of over 60 instructions is provided to
enable programmers to implement their application with the minimum of programming overheads.
For easier understanding of the various instruction codes, they have been subdivided into several
functional groupings.
Instruction Timing
Most instructions are implemented within one instruction cycle. The exceptions to this are branch,
call, or table read instructions where two instruction cycles are required. One instruction cycle is
equal to 4 system clock cycles, therefore in the case of an 8MHz system oscillator, most instructions
would be implemented within 0.5μs and branch or call instructions would be implemented within
1μs. Although instructions which require one more cycle to implement are generally limited to
the JMP, CALL, RET, RETI and table read instructions, it is important to realize that any other
instructions which involve manipulation of the Program Counter Low register or PCL will also take
one more cycle to implement. As instructions which change the contents of the PCL will imply a
direct jump to that new address, one more cycle will be required. Examples of such instructions
would be "CLR PCL" or "MOV PCL, A". For the case of skip instructions, it must be noted that if
the result of the comparison involves a skip operation then this will also take one more cycle, if no
skip is involved then only one cycle is required.
Moving and Transferring Data
The transfer of data within the microcontroller program is one of the most frequently used
operations. Making use of three kinds of MOV instructions, data can be transferred from registers to
the Accumulator and vice-versa as well as being able to move specific immediate data directly into
the Accumulator. One of the most important data transfer applications is to receive data from the
input ports and transfer data to the output ports.
Arithmetic Operations
The ability to perform certain arithmetic operations and data manipulation is a necessary feature of
most microcontroller applications. Within the Holtek microcontroller instruction set are a range of
add and subtract instruction mnemonics to enable the necessary arithmetic to be carried out. Care
must be taken to ensure correct handling of carry and borrow data when results exceed 255 for
addition and less than 0 for subtraction. The increment and decrement instructions INC, INCA, DEC
and DECA provide a simple means of increasing or decreasing by a value of one of the values in the
destination specified.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Logical and Rotate Operation
The standard logical operations such as AND, OR, XOR and CPL all have their own instruction
within the Holtek microcontroller instruction set. As with the case of most instructions involving
data manipulation, data must pass through the Accumulator which may involve additional
programming steps. In all logical data operations, the zero flag may be set if the result of the
operation is zero. Another form of logical data manipulation comes from the rotate instructions such
as RR, RL, RRC and RLC which provide a simple means of rotating one bit right or left. Different
rotate instructions exist depending on program requirements. Rotate instructions are useful for serial
port programming applications where data can be rotated from an internal register into the Carry
bit from where it can be examined and the necessary serial bit set high or low. Another application
which rotate data operations are used is to implement multiplication and division calculations.
Branches and Control Transfer
Program branching takes the form of either jumps to specified locations using the JMP instruction
or to a subroutine using the CALL instruction. They differ in the sense that in the case of a
subroutine call, the program must return to the instruction immediately when the subroutine has
been carried out. This is done by placing a return instruction "RET" in the subroutine which will
cause the program to jump back to the address right after the CALL instruction. In the case of a JMP
instruction, the program simply jumps to the desired location. There is no requirement to jump back
to the original jumping off point as in the case of the CALL instruction. One special and extremely
useful set of branch instructions are the conditional branches. Here a decision is first made regarding
the condition of a certain data memory or individual bits. Depending upon the conditions, the
program will continue with the next instruction or skip over it and jump to the following instruction.
These instructions are the key to decision making and branching within the program perhaps
determined by the condition of certain input switches or by the condition of internal data bits.
Bit Operations
The ability to provide single bit operations on Data Memory is an extremely flexible feature of all
Holtek microcontrollers. This feature is especially useful for output port bit programming where
individual bits or port pins can be directly set high or low using either the "SET [m].i" or "CLR [m].
i" instructions respectively. The feature removes the need for programmers to first read the 8-bit
output port, manipulate the input data to ensure that other bits are not changed and then output the
port with the correct new data. This read-modify-write process is taken care of automatically when
these bit operation instructions are used.
Table Read Operations
Data storage is normally implemented by using registers. However, when working with large
amounts of fixed data, the volume involved often makes it inconvenient to store the fixed data in
the Data Memory. To overcome this problem, Holtek microcontrollers allow an area of Program
Memory to be set as a table where data can be directly stored. A set of easy to use instructions
provides the means by which this fixed data can be referenced and retrieved from the Program
Memory.
Other Operations
In addition to the above functional instructions, a range of other instructions also exist such as
the "HALT" instruction for Power-down operations and instructions to control the operation of
the Watchdog Timer for reliable program operations under extreme electric or electromagnetic
environments. For their relevant operations, refer to the functional related sections.
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Instruction Set Summary
The following table depicts a summary of the instruction set categorised according to function and
can be consulted as a basic instruction reference using the following listed conventions.
Table Conventions
x: Bits immediate data
m: Data Memory address
A: Accumulator
i: 0~7 number of bits
addr: Program memory address
Mnemonic
Description
Cycles
Flag Affected
Add Data Memory to ACC
Add ACC to Data Memory
Add immediate data to ACC
Add Data Memory to ACC with Carry
Add ACC to Data memory with Carry
Subtract immediate data from the ACC
Subtract Data Memory from ACC
Subtract Data Memory from ACC with result in Data Memory
Subtract Data Memory from ACC with Carry
Subtract Data Memory from ACC with Carry, result in Data Memory
Decimal adjust ACC for Addition with result in Data Memory
1
1Note
1
1
1Note
1
1
1Note
1
1Note
1Note
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
Z, C, AC, OV
C
1
1
1
1Note
1Note
1Note
1
1
1
1Note
1
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Increment Data Memory with result in ACC
Increment Data Memory
Decrement Data Memory with result in ACC
Decrement Data Memory
1
1Note
1
1Note
Z
Z
Z
Z
Rotate Data Memory right with result in ACC
Rotate Data Memory right
Rotate Data Memory right through Carry with result in ACC
Rotate Data Memory right through Carry
Rotate Data Memory left with result in ACC
Rotate Data Memory left
Rotate Data Memory left through Carry with result in ACC
Rotate Data Memory left through Carry
1
1Note
1
1Note
1
1Note
1
1Note
None
None
C
C
None
None
C
C
Arithmetic
ADD A,[m]
ADDM A,[m]
ADD A,x
ADC A,[m]
ADCM A,[m]
SUB A,x
SUB A,[m]
SUBM A,[m]
SBC A,[m]
SBCM A,[m]
DAA [m]
Logic Operation
AND A,[m]
OR A,[m]
XOR A,[m]
ANDM A,[m]
ORM A,[m]
XORM A,[m]
AND A,x
OR A,x
XOR A,x
CPL [m]
CPLA [m]
Logical AND Data Memory to ACC
Logical OR Data Memory to ACC
Logical XOR Data Memory to ACC
Logical AND ACC to Data Memory
Logical OR ACC to Data Memory
Logical XOR ACC to Data Memory
Logical AND immediate Data to ACC
Logical OR immediate Data to ACC
Logical XOR immediate Data to ACC
Complement Data Memory
Complement Data Memory with result in ACC
Increment & Decrement
INCA [m]
INC [m]
DECA [m]
DEC [m]
Rotate
RRA [m]
RR [m]
RRCA [m]
RRC [m]
RLA [m]
RL [m]
RLCA [m]
RLC [m]
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Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Mnemonic
Description
Cycles
Flag Affected
Move Data Memory to ACC
Move ACC to Data Memory
Move immediate data to ACC
1
1Note
1
None
None
None
Clear bit of Data Memory
Set bit of Data Memory
1Note
1Note
None
None
Jump unconditionally
Skip if Data Memory is zero
Skip if Data Memory is zero with data movement to ACC
Skip if bit i of Data Memory is zero
Skip if bit i of Data Memory is not zero
Skip if increment Data Memory is zero
Skip if decrement Data Memory is zero
Skip if increment Data Memory is zero with result in ACC
Skip if decrement Data Memory is zero with result in ACC
Subroutine call
Return from subroutine
Return from subroutine and load immediate data to ACC
Return from interrupt
2
1Note
1Note
1Note
1Note
1Note
1Note
1Note
1Note
2
2
2
2
None
None
None
None
None
None
None
None
None
None
None
None
None
Read table (specific page) to TBLH and Data Memory
Read table (current page) to TBLH and Data Memory
Read table (last page) to TBLH and Data Memory
2Note
2Note
2Note
None
None
None
No operation
Clear Data Memory
Set Data Memory
Clear Watchdog Timer
Pre-clear Watchdog Timer
Pre-clear Watchdog Timer
Swap nibbles of Data Memory
Swap nibbles of Data Memory with result in ACC
Enter power down mode
1
1Note
1Note
1
1
1
1Note
1
1
None
None
None
TO, PDF
TO, PDF
TO, PDF
None
None
TO, PDF
Data Move
MOV A,[m]
MOV [m],A
MOV A,x
Bit Operation
CLR [m].i
SET [m].i
Branch
JMP addr
SZ [m]
SZA [m]
SZ [m].i
SNZ [m].i
SIZ [m]
SDZ [m]
SIZA [m]
SDZA [m]
CALL addr
RET
RET A,x
RETI
Table Read
TABRD [m]
TABRDC [m]
TABRDL [m]
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Note: 1. For skip instructions, if the result of the comparison involves a skip then two cycles are required, if no
skip takes place only one cycle is required.
2. Any instruction which changes the contents of the PCL will also require 2 cycles for execution.
3. For the "CLR WDT1" and "CLR WDT2" instructions the TO and PDF flags may be affected by the
execution status. The TO and PDF flags are cleared after both "CLR WDT1" and "CLR WDT2"
instructions are consecutively executed. Otherwise the TO and PDF flags remain unchanged.
Rev. 1.10
128
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Instruction Definition
ADC A,[m]
Description
Operation
Affected flag(s)
Add Data Memory to ACC with Carry
The contents of the specified Data Memory, Accumulator and the carry flag are added.
The result is stored in the Accumulator.
ACC ← ACC + [m] + C
OV, Z, AC, C
ADCM A,[m]
Description
Operation
Affected flag(s)
Add ACC to Data Memory with Carry
The contents of the specified Data Memory, Accumulator and the carry flag are added. The result is stored in the specified Data Memory.
[m] ← ACC + [m] + C
OV, Z, AC, C
Add Data Memory to ACC
ADD A,[m]
Description
The contents of the specified Data Memory and the Accumulator are added.
The result is stored in the Accumulator.
Operation
Affected flag(s)
ACC ← ACC + [m]
OV, Z, AC, C
ADD A,x
Description
Operation
Affected flag(s)
Add immediate data to ACC
The contents of the Accumulator and the specified immediate data are added. The result is stored in the Accumulator.
ACC ← ACC + x
OV, Z, AC, C
ADDM A,[m]
Description
Operation
Affected flag(s)
Add ACC to Data Memory
The contents of the specified Data Memory and the Accumulator are added. The result is stored in the specified Data Memory.
[m] ← ACC + [m]
OV, Z, AC, C
AND A,[m]
Description
Operation
Affected flag(s)
Logical AND Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise logical AND operation. The result is stored in the Accumulator.
ACC ← ACC ″AND″ [m]
Z
AND A,x
Description
Operation
Affected flag(s)
Logical AND immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bit wise logical AND operation. The result is stored in the Accumulator.
ACC ← ACC ″AND″ x
Z
ANDM A,[m]
Description
Operation
Affected flag(s)
Logical AND ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical AND
operation. The result is stored in the Data Memory.
[m] ← ACC ″AND″ [m]
Z
Rev. 1.10
129
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
CALL addr
Description
Operation
Affected flag(s)
Subroutine call
Unconditionally calls a subroutine at the specified address. The Program Counter then
increments by 1 to obtain the address of the next instruction which is then pushed onto the
stack. The specified address is then loaded and the program continues execution from this
new address. As this instruction requires an additional operation, it is a two cycle instruction.
Stack ← Program Counter + 1
Program Counter ← addr
None
CLR [m]
Description
Operation
Affected flag(s)
Clear Data Memory
Each bit of the specified Data Memory is cleared to 0.
[m] ← 00H
None
CLR [m].i
Description
Operation
Affected flag(s)
Clear bit of Data Memory
Bit i of the specified Data Memory is cleared to 0.
[m].i ← 0
None
CLR WDT
Description
Operation
Affected flag(s)
Clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CLR WDT1
Description
Operation
Affected flag(s)
Pre-clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in
conjunction with CLR WDT2 and must be executed alternately with CLR WDT2 to have
effect. Repetitively executing this instruction without alternately executing CLR WDT2 will
have no effect.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CLR WDT2
Description
Operation
Affected flag(s)
Pre-clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunction
with CLR WDT1 and must be executed alternately with CLR WDT1 to have effect.
Repetitively executing this instruction without alternately executing CLR WDT1 will have no
effect.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CPL [m]
Description
Operation
Affected flag(s)
Complement Data Memory
Each bit of the specified Data Memory is logically complemented (1′s complement). Bits which
previously contained a 1 are changed to 0 and vice versa.
[m] ← [m]
Z
Rev. 1.10
130
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
CPLA [m]
Description
Operation
Affected flag(s)
Complement Data Memory with result in ACC
Each bit of the specified Data Memory is logically complemented (1′s complement). Bits which
previously contained a 1 are changed to 0 and vice versa. The complemented result is stored in
the Accumulator and the contents of the Data Memory remain unchanged.
ACC ← [m]
Z
DAA [m]
Description
Operation
Affected flag(s)
Decimal-Adjust ACC for addition with result in Data Memory
Convert the contents of the Accumulator value to a BCD (Binary Coded Decimal) value
resulting from the previous addition of two BCD variables. If the low nibble is greater than 9
or if AC flag is set, then a value of 6 will be added to the low nibble. Otherwise the low nibble
remains unchanged. If the high nibble is greater than 9 or if the C flag is set, then a value of 6
will be added to the high nibble. Essentially, the decimal conversion is performed by adding
00H, 06H, 60H or 66H depending on the Accumulator and flag conditions. Only the C flag
may be affected by this instruction which indicates that if the original BCD sum is greater than
100, it allows multiple precision decimal addition.
[m] ← ACC + 00H or
[m] ← ACC + 06H or [m] ← ACC + 60H or
[m] ← ACC + 66H
C
DEC [m]
Description
Operation
Affected flag(s)
Decrement Data Memory
Data in the specified Data Memory is decremented by 1.
[m] ← [m] − 1
Z
DECA [m]
Description
Operation
Affected flag(s)
Decrement Data Memory with result in ACC
Data in the specified Data Memory is decremented by 1. The result is stored in the
Accumulator. The contents of the Data Memory remain unchanged.
ACC ← [m] − 1
Z
HALT
Description
Operation
Affected flag(s)
Enter power down mode
This instruction stops the program execution and turns off the system clock. The contents of the Data Memory and registers are retained. The WDT and prescaler are cleared. The power
down flag PDF is set and the WDT time-out flag TO is cleared.
TO ← 0
PDF ← 1
TO, PDF
INC [m]
Description
Operation
Affected flag(s)
Increment Data Memory
Data in the specified Data Memory is incremented by 1.
[m] ← [m] + 1
Z
INCA [m]
Description
Operation
Affected flag(s)
Increment Data Memory with result in ACC
Data in the specified Data Memory is incremented by 1. The result is stored in the Accumulator.
The contents of the Data Memory remain unchanged.
ACC ← [m] + 1
Z
Rev. 1.10
131
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
JMP addr
Description
Operation
Affected flag(s)
Jump unconditionally
The contents of the Program Counter are replaced with the specified address. Program
execution then continues from this new address. As this requires the insertion of a dummy
instruction while the new address is loaded, it is a two cycle instruction.
Program Counter ← addr
None
MOV A,[m]
Description
Operation
Affected flag(s)
Move Data Memory to ACC
The contents of the specified Data Memory are copied to the Accumulator.
ACC ← [m]
None
MOV A,x
Description
Operation
Affected flag(s)
Move immediate data to ACC
The immediate data specified is loaded into the Accumulator.
ACC ← x
None
MOV [m],A
Description
Operation
Affected flag(s)
Move ACC to Data Memory
The contents of the Accumulator are copied to the specified Data Memory.
[m] ← ACC
None
NOP
Description
Operation
Affected flag(s)
No operation
No operation is performed. Execution continues with the next instruction.
No operation
None
OR A,[m]
Description
Operation
Affected flag(s)
Logical OR Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise
logical OR operation. The result is stored in the Accumulator.
ACC ← ACC ″OR″ [m]
Z
OR A,x
Description
Operation
Affected flag(s)
Logical OR immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bitwise logical OR operation. The result is stored in the Accumulator.
ACC ← ACC ″OR″ x
Z
ORM A,[m]
Description
Operation
Affected flag(s)
Logical OR ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical OR operation. The result is stored in the Data Memory.
[m] ← ACC ″OR″ [m]
Z
RET
Description
Operation
Affected flag(s)
Return from subroutine
The Program Counter is restored from the stack. Program execution continues at the restored
address.
Program Counter ← Stack
None
Rev. 1.10
132
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
RET A,x
Description
Operation
Affected flag(s)
Return from subroutine and load immediate data to ACC
The Program Counter is restored from the stack and the Accumulator loaded with the specified immediate data. Program execution continues at the restored address.
Program Counter ← Stack
ACC ← x
None
RETI
Description
Operation
Affected flag(s)
Return from interrupt
The Program Counter is restored from the stack and the interrupts are re-enabled by setting the
EMI bit. EMI is the master interrupt global enable bit. If an interrupt was pending when the RETI instruction is executed, the pending Interrupt routine will be processed before returning to the main program.
Program Counter ← Stack
EMI ← 1
None
RL [m]
Description
Operation
Affected flag(s)
Rotate Data Memory left
The contents of the specified Data Memory are rotated left by 1 bit with bit 7 rotated into bit 0.
[m].(i+1) ← [m].i; (i=0~6)
[m].0 ← [m].7
None
RLA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory left with result in ACC
The contents of the specified Data Memory are rotated left by 1 bit with bit 7 rotated into bit 0.
The rotated result is stored in the Accumulator and the contents of the Data Memory remain
unchanged.
ACC.(i+1) ← [m].i; (i=0~6)
ACC.0 ← [m].7
None
RLC [m]
Description
Operation
Affected flag(s)
Rotate Data Memory left through Carry
The contents of the specified Data Memory and the carry flag are rotated left by 1 bit. Bit 7
replaces the Carry bit and the original carry flag is rotated into bit 0.
[m].(i+1) ← [m].i; (i=0~6)
[m].0 ← C
C ← [m].7
C
RLCA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory left through Carry with result in ACC
Data in the specified Data Memory and the carry flag are rotated left by 1 bit. Bit 7 replaces the
Carry bit and the original carry flag is rotated into the bit 0. The rotated result is stored in the
Accumulator and the contents of the Data Memory remain unchanged.
ACC.(i+1) ← [m].i; (i=0~6)
ACC.0 ← C
C ← [m].7
C
RR [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right
The contents of the specified Data Memory are rotated right by 1 bit with bit 0 rotated into bit 7.
[m].i ← [m].(i+1); (i=0~6)
[m].7 ← [m].0
None
Rev. 1.10
133
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
RRA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right with result in ACC
Data in the specified Data Memory and the carry flag are rotated right by 1 bit with bit 0
rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the
Data Memory remain unchanged.
ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← [m].0
None
RRC [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right through Carry
The contents of the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0
replaces the Carry bit and the original carry flag is rotated into bit 7.
[m].i ← [m].(i+1); (i=0~6)
[m].7 ← C
C ← [m].0
C
RRCA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right through Carry with result in ACC
Data in the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0 replaces the Carry bit and the original carry flag is rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the Data Memory remain unchanged.
ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← C
C ← [m].0
C
SBC A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with Carry
The contents of the specified Data Memory and the complement of the carry flag are
subtracted from the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is
positive or zero, the C flag will be set to 1.
ACC ← ACC − [m] − C
OV, Z, AC, C
SBCM A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with Carry and result in Data Memory
The contents of the specified Data Memory and the complement of the carry flag are subtracted from the Accumulator. The result is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
[m] ← ACC − [m] − C
OV, Z, AC, C
SDZ [m]
Description
Operation
Affected flag(s)
Skip if decrement Data Memory is 0
The contents of the specified Data Memory are first decremented by 1. If the result is 0 the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
[m] ← [m] − 1
Skip if [m]=0
None
Rev. 1.10
134
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SDZA [m]
Description
Operation
Affected flag(s)
Skip if decrement Data Memory is zero with result in ACC
The contents of the specified Data Memory are first decremented by 1. If the result is 0, the following instruction is skipped. The result is stored in the Accumulator but the specified Data Memory contents remain unchanged. As this requires the insertion of a dummy
instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0,
the program proceeds with the following instruction.
ACC ← [m] − 1
Skip if ACC=0
None
SET [m]
Description
Operation
Affected flag(s)
Set Data Memory
Each bit of the specified Data Memory is set to 1.
[m] ← FFH
None
SET [m].i
Description
Operation
Affected flag(s)
Set bit of Data Memory
Bit i of the specified Data Memory is set to 1.
[m].i ← 1
None
SIZ [m]
Description
Operation
Affected flag(s)
Skip if increment Data Memory is 0
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the
following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program
proceeds with the following instruction.
[m] ← [m] + 1
Skip if [m]=0
None
SIZA [m]
Description
Operation
Affected flag(s)
Skip if increment Data Memory is zero with result in ACC
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the following instruction is skipped. The result is stored in the Accumulator but the specified
Data Memory contents remain unchanged. As this requires the insertion of a dummy
instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not
0 the program proceeds with the following instruction.
ACC ← [m] + 1
Skip if ACC=0
None
SNZ [m].i
Description
Operation
Affected flag(s)
Skip if bit i of Data Memory is not 0
If bit i of the specified Data Memory is not 0, the following instruction is skipped. As this
requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is 0 the program proceeds with the following instruction.
Skip if [m].i ≠ 0
None
SUB A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC
The specified Data Memory is subtracted from the contents of the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
ACC ← ACC − [m]
OV, Z, AC, C
Rev. 1.10
135
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
SUBM A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with result in Data Memory
The specified Data Memory is subtracted from the contents of the Accumulator. The result is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
[m] ← ACC − [m]
OV, Z, AC, C
SUB A,x
Description
Operation
Affected flag(s)
Subtract immediate data from ACC
The immediate data specified by the code is subtracted from the contents of the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
ACC ← ACC − x
OV, Z, AC, C
SWAP [m]
Description
Operation
Affected flag(s)
Swap nibbles of Data Memory
The low-order and high-order nibbles of the specified Data Memory are interchanged.
[m].3~[m].0 ↔ [m].7~[m].4
None
SWAPA [m]
Description
Operation
Affected flag(s)
Swap nibbles of Data Memory with result in ACC
The low-order and high-order nibbles of the specified Data Memory are interchanged. The result is stored in the Accumulator. The contents of the Data Memory remain unchanged.
ACC.3~ACC.0 ← [m].7~[m].4
ACC.7~ACC.4 ← [m].3~[m].0
None
SZ [m]
Description
Operation
Affected flag(s)
Skip if Data Memory is 0
If the contents of the specified Data Memory is 0, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
Skip if [m]=0
None
SZA [m]
Description
Operation
Affected flag(s)
Skip if Data Memory is 0 with data movement to ACC
The contents of the specified Data Memory are copied to the Accumulator. If the value is zero, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
ACC ← [m]
Skip if [m]=0
None
SZ [m].i
Description
Operation
Affected flag(s)
Skip if bit i of Data Memory is 0
If bit i of the specified Data Memory is 0, the following instruction is skipped. As this requires
the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle
instruction. If the result is not 0, the program proceeds with the following instruction.
Skip if [m].i=0
None
Rev. 1.10
136
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
TABRD [m]
Description
Operation
Affected flag(s)
Read table (specific page) to TBLH and Data Memory
The low byte of the program code (specific page) addressed by the table pointer pair (TBHP and TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
TABRDC [m]
Description
Operation
Affected flag(s)
Read table (current page) to TBLH and Data Memory
The low byte of the program code (current page) addressed by the table pointer (TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
TABRDL [m]
Description
Operation
Affected flag(s)
Read table (last page) to TBLH and Data Memory
The low byte of the program code (last page) addressed by the table pointer (TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
XOR A,[m]
Description
Operation
Affected flag(s)
Logical XOR Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise logical XOR operation. The result is stored in the Accumulator.
ACC ← ACC ″XOR″ [m]
Z
XORM A,[m]
Description
Operation
Affected flag(s)
Logical XOR ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical XOR operation. The result is stored in the Data Memory.
[m] ← ACC ″XOR″ [m]
Z
XOR A,x
Description
Operation
Affected flag(s)
Logical XOR immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bitwise logical XOR operation. The result is stored in the Accumulator.
ACC ← ACC ″XOR″ x
Z
Rev. 1.10
137
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Package Information
Note that the package information provided here is for consultation purposes only. As this
information may be updated at regular intervals users are reminded to consult the Holtek website for
the latest version of the package information.
Additional supplementary information with regard to packaging is listed below. Click on the relevant
section to be transferred to the relevant website page.
• Further Package Information (include Outline Dimensions, Product Tape and Reel Specifications)
• Packing Meterials Information
• Carton information
Rev. 1.10
138
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
8-pin SOP (150mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.236 BSC
—
B
—
0.154 BSC
—
0.020
C
0.012
—
C’
—
0.193 BSC
—
D
—
—
0.069
E
—
0.050 BSC
—
F
0.004
—
0.010
G
0.016
—
0.050
H
0.004
—
0.010
α
0°
—
8°
Symbol
Dimensions in mm
Min.
Nom.
Max.
—
6.00 BSC
—
B
—
3.90 BSC
—
C
0.31
—
0.51
C’
—
4.90 BSC
—
D
—
—
1.75
E
—
1.27 BSC
—
F
0.10
—
0.25
G
0.40
—
1.27
H
0.10
—
0.25
α
0°
—
8°
A
Rev. 1.10
139
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
10-pin MSOP Outline Dimensions
Symbol
Min.
Nom.
Max.
A
—
—
0.043
A1
0.000
—
0.006
A2
0.030
0.033
0.037
B
0.007
—
0.013
C
0.003
—
0.009
D
—
0.118 BSC
—
E
—
0.193 BSC
—
E1
—
0.118 BSC
—
e
—
0.020 BSC
—
L
0.016
0.024
0.031
L1
—
0.037 BSC
—
y
—
0.004
—
θ
0°
—
8°
Symbol
Rev. 1.10
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
—
—
1.10
A1
0.00
—
0.15
A2
0.75
0.85
0.95
B
0.17
—
0.33
C
0.08
—
0.23
D
—
3.0 BSC
—
E
—
4.9 BSC
—
E1
—
3.0 BSC
—
e
—
0.5 BSC
—
L
0.40
0.60
0.80
L1
—
0.95 BSC
—
y
—
0.1
—
θ
0°
—
8°
140
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
16-pin NSOP (150mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.236 BSC
—
B
—
0.154 BSC
—
C
0.012
—
0.020
C’
—
0.390 BSC
—
D
—
—
0.069
E
—
0.050 BSC
—
F
0.004
—
0.010
G
0.016
—
0.050
H
0.004
—
0.010
α
0°
—
8°
Symbol
Rev. 1.10
Dimensions in mm
Min.
Nom.
Max.
A
—
6.0 BSC
—
B
—
3.9 BSC
—
C
0.31
—
0.51
C’
—
9.9 BSC
—
D
—
—
1.75
E
—
1.27 BSC
—
F
0.10
—
0.25
G
0.40
—
1.27
H
0.10
—
0.25
α
0°
—
8°
141
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
20-pin DIP (300mil) Outline Dimensions
Fig 1. Full Lead Packages
Fig 2. 1/2 Lead Packages
See Fig 1
Symbol
Nom.
Max.
A
0.980
1.030
1.060
B
0.240
0.250
0.280
C
0.115
0.130
0.195
D
0.115
0.130
0.150
E
0.014
0.018
0.022
F
0.045
0.060
0.070
G
—
0.1BSC
—
H
0.300
0.310
0.325
I
—
—
0.430
Symbol
Rev. 1.10
Dimensions in inch
Min.
Dimensions in mm
Min.
Nom.
Max.
A
24.89
26.16
26.92
B
6.10
6.35
7.11
C
2.92
3.30
4.95
D
2.92
3.30
3.81
E
0.36
0.46
0.56
F
1.14
1.52
1.78
G
—
2.54 BSC
—
H
7.62
7.87
8.26
I
—
—
10.92
142
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
See Fig2
Symbol
Min.
Nom.
Max.
A
0.945
0.965
0.985
B
0.275
0.285
0.295
C
0.120
0.135
0.150
D
0.110
0.130
0.150
E
0.014
0.018
0.022
F
0.045
0.050
0.060
G
—
0.1BSC
—
H
0.300
0.310
0.325
I
—
—
0.430
Symbol
Rev. 1.10
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
24.00
24.51
25.02
B
6.99
7.24
7.49
C
3.05
3.43
3.81
D
2.79
3.30
3.81
E
0.36
0.46
0.56
F
1.14
1.27
1.52
G
—
2.54 BSC
—
H
7.62
7.87
8.26
I
—
—
10.92
143
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
20-pin SOP (300mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.406 BSC
—
B
—
0.406 BSC
—
C
0.012
—
0.020
C’
—
0.504 BSC
—
D
—
—
0.104
E
—
0.050 BSC
—
F
0.004
—
0.012
G
0.016
—
0.050
H
0.008
—
0.013
α
0°
—
8°
Symbol
Rev. 1.10
Dimensions in mm
Min.
Nom.
Max.
A
—
10.30 BSC
—
B
—
7.50 BSC
—
C
—
7.50 BSC
—
C’
—
12.80 BSC
—
D
—
12.80 BSC
—
E
—
1.27 BSC
—
F
0.10
—
0.30
G
0.40
—
1.27
H
0.40
—
1.27
α
0°
—
8°
144
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
20-pin SSOP (150mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
—
A
—
0.236 BSC
B
—
0.155 BSC
—
C
0.008
—
0.012
C’
—
0.341 BSC
—
D
—
—
0.069
E
—
0.025 BSC
—
F
0.004
—
0.0098
G
0.016
—
0.05
H
0.004
—
0.01
α
0°
―
8°
Symbol
Rev. 1.10
Dimensions in mm
Min.
Nom.
Max.
A
—
6.00 BSC
—
B
—
3.90 BSC
—
C
0.20
—
0.30
C‘
—
8.66 BSC
—
D
—
—
1.75
E
—
0.635 BSC
—
F
0.10
—
0.25
G
0.41
—
1.27
H
0.10
—
0.25
α
0°
―
8°
145
September 19, 2014
HT66F002/HT66F003/HT66F004
Cost-Effective A/D Flash 8-Bit MCU with EEPROM
Copyright© 2014 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time
of publication. However, Holtek assumes no responsibility arising from the use of
the specifications described. The applications mentioned herein are used solely
for the purpose of illustration and Holtek makes no warranty or representation that
such applications will be suitable without further modification, nor recommends
the use of its products for application that may present a risk to human life due to
malfunction or otherwise. Holtek's products are not authorized for use as critical
components in life support devices or systems. Holtek reserves the right to alter
its products without prior notification. For the most up-to-date information, please
visit our web site at http://www.holtek.com.tw.
Rev. 1.10
146
September 19, 2014