BS82B12A-3_C16A-3_D20A-3v140.pdf

Touch 8-Bit Flash MCU with LED/LCD Driver
BS82B12A-3/BS82C16A-3/BS82D20A-3
Revision: V1.40
Date: ��
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Table of Contents
Features............................................................................................................. 6
CPU Features.......................................................................................................................... 6
Peripheral Features.................................................................................................................. 6
General Description ......................................................................................... 7
Selection Table.................................................................................................. 7
Block Diagram................................................................................................... 8
Pin Assignment................................................................................................. 8
Pin Descriptions............................................................................................. 12
Absolute Maximum Ratings........................................................................... 19
D.C. Characteristics........................................................................................ 19
A.C. Characteristics........................................................................................ 21
Sensor Oscillator Electrical Characteristics................................................ 22
Power-on Reset Characteristics.................................................................... 25
System Architecture....................................................................................... 26
Clocking and Pipelining.......................................................................................................... 26
Program Counter.................................................................................................................... 27
Stack...................................................................................................................................... 28
Arithmetic and Logic Unit – ALU............................................................................................ 28
Flash Program Memory.................................................................................. 29
Structure................................................................................................................................. 29
Special Vectors...................................................................................................................... 30
Look-up Table......................................................................................................................... 30
Table Program Example......................................................................................................... 30
In Circuit Programming – ICP................................................................................................ 31
On-Chip Debug Support – OCDS.......................................................................................... 32
RAM Data Memory.......................................................................................... 33
Structure................................................................................................................................. 33
Special Function Register Description......................................................... 37
Indirect Addressing Registers – IAR0, IAR1.......................................................................... 37
Memory Pointers – MP0, MP1............................................................................................... 37
Bank Pointer – BP.................................................................................................................. 38
Accumulator – ACC................................................................................................................ 39
Program Counter Low Register – PCL................................................................................... 39
Look-up Table Registers – TBLP, TBHP, TBLH...................................................................... 39
Status Register – STATUS..................................................................................................... 40
EEPROM Data Memory................................................................................... 42
EEPROM Data Memory Structure......................................................................................... 42
EEPROM Registers............................................................................................................... 42
Reading Data from the EEPROM ......................................................................................... 44
Rev. 1.40
2
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Writing Data to the EEPROM................................................................................................. 44
Write Protection...................................................................................................................... 44
EEPROM Interrupt................................................................................................................. 44
Programming Considerations................................................................................................. 45
Oscillator......................................................................................................... 46
Oscillator Overview................................................................................................................ 46
System Clock Configurations................................................................................................. 46
Internal RC Oscillator – HIRC................................................................................................ 47
Internal 32kHz Oscillator – LIRC............................................................................................ 47
External 32.768kHz Crystal Oscillator – LXT......................................................................... 48
LXT Oscillator Low Power Function ...................................................................................... 49
Operating Modes and System Clocks.......................................................... 49
System Clocks....................................................................................................................... 49
System Operation Modes....................................................................................................... 51
Control Register..................................................................................................................... 52
Operating Mode Switching .................................................................................................... 54
NORMAL Mode to SLOW Mode Switching............................................................................ 54
SLOW Mode to NORMAL Mode Switching ........................................................................... 55
Entering the SLEEP Mode..................................................................................................... 55
Entering the IDLE0 Mode....................................................................................................... 56
Entering the IDLE1 Mode....................................................................................................... 56
Standby Current Considerations............................................................................................ 56
Wake-up................................................................................................................................. 57
Programming Considerations................................................................................................. 57
Watchdog Timer.............................................................................................. 58
Watchdog Timer Clock Source............................................................................................... 58
Watchdog Timer Control Register.......................................................................................... 58
Watchdog Timer Operation.................................................................................................... 59
Reset and Initialisation................................................................................... 60
Reset Functions..................................................................................................................... 60
Reset Initial Conditions.......................................................................................................... 62
Input/Output Ports.......................................................................................... 66
I/O Register List..................................................................................................................... 66
Pull-high Resistors................................................................................................................. 67
Port A Wake-up...................................................................................................................... 67
I/O Port Control Registers...................................................................................................... 67
I/O Pin Structures................................................................................................................... 67
Source Current Selection....................................................................................................... 68
Programming Considerations................................................................................................. 69
Timer Modules – TM....................................................................................... 70
Introduction............................................................................................................................ 70
TM Operation......................................................................................................................... 70
TM Clock Source.................................................................................................................... 70
TM Interrupts.......................................................................................................................... 71
Rev. 1.40
3
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
TM External Pins.................................................................................................................... 71
TM Input/Output Pin Control Register.................................................................................... 71
Programming Considerations................................................................................................. 74
Compact Type TM – CTM0............................................................................. 75
Compact TM Operation.......................................................................................................... 75
Compact Type TM Register Description................................................................................ 76
Compact Type TM Operating Modes..................................................................................... 80
Compare Match Output Mode................................................................................................ 80
Timer/Counter Mode.............................................................................................................. 83
PWM Output Mode................................................................................................................. 83
Periodic Type TM – PTM0............................................................................... 86
Periodic TM Operation........................................................................................................... 86
Periodic Type TM Register Description.................................................................................. 87
Periodic Type TM Operating Modes....................................................................................... 91
Compare Match Output Mode................................................................................................ 91
Timer/Counter Mode.............................................................................................................. 94
PWM Output Mode................................................................................................................. 94
Single Pulse Mode................................................................................................................. 96
Capture Input Mode............................................................................................................... 98
Touch Key Function..................................................................................... 100
Touch Key Structure............................................................................................................. 100
Touch Key Register Definition.............................................................................................. 100
Touch Key Operation............................................................................................................ 105
Touch Key Interrupt.............................................................................................................. 108
Programming Considerations............................................................................................... 108
I C Interface .................................................................................................. 109
2
I2C Interface Operation ........................................................................................................ 109
I2C Registers.........................................................................................................................110
I2C Bus Communication .......................................................................................................114
I2C Bus Start Signal ..............................................................................................................114
Slave Address ......................................................................................................................115
I2C Bus Read/Write Signal ...................................................................................................115
I2C Bus Slave Address Acknowledge Signal ........................................................................115
I2C Bus Data and Acknowledge Signal ................................................................................115
UART Interface ..............................................................................................118
UART External Pin Interfacing..............................................................................................118
UART Data Transfer Scheme...............................................................................................119
UART Status and Control Registers.....................................................................................119
Baud Rate Generator........................................................................................................... 125
Calculating the Baud Rate and Error Values........................................................................ 126
UART Setup and Control..................................................................................................... 126
UART Transmitter................................................................................................................ 128
UART Receiver.................................................................................................................... 129
Managing Receiver Errors................................................................................................... 130
Rev. 1.40
4
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
UART Module Interrupt Structure......................................................................................... 131
Address Detect Mode........................................................................................................... 132
UART Power Down and Wake-up........................................................................................ 133
Interrupts....................................................................................................... 134
Interrupt Registers................................................................................................................ 134
Interrupt Operation............................................................................................................... 137
External Interrupt.................................................................................................................. 138
Time Base Interrupts............................................................................................................ 139
TM Interrupts........................................................................................................................ 140
EEPROM Interrupt............................................................................................................... 140
LVD Interrupt........................................................................................................................ 141
Touch Key Interrupt.............................................................................................................. 141
I2C Interrupt.......................................................................................................................... 141
UART Interrupt.................................................................................................................... 141
Interrupt Wake-up Function.................................................................................................. 142
Programming Considerations............................................................................................... 142
SCOM and SSEG Function for LCD............................................................ 143
LCD Operation..................................................................................................................... 143
LCD Bias Control................................................................................................................. 145
Low Voltage Detector – LVD........................................................................ 147
LVD Register........................................................................................................................ 147
LVD Operation...................................................................................................................... 148
Configuration Options.................................................................................. 149
Application Circuit........................................................................................ 149
Instruction Set............................................................................................... 150
Introduction.......................................................................................................................... 150
Instruction Timing................................................................................................................. 150
Moving and Transferring Data.............................................................................................. 150
Arithmetic Operations........................................................................................................... 150
Logical and Rotate Operation.............................................................................................. 151
Branches and Control Transfer............................................................................................ 151
Bit Operations...................................................................................................................... 151
Table Read Operations........................................................................................................ 151
Other Operations.................................................................................................................. 151
Instruction Set Summary............................................................................. 152
Table Conventions................................................................................................................ 152
Instruction Definition.................................................................................... 154
Package Information.................................................................................... 163
20-pin SOP (300mil) Outline Dimensions............................................................................ 164
24-pin SOP(300mil) Outline Dimensions............................................................................. 165
SAW Type 24-pin (4mm×4mm) QFN Outline Dimensions................................................... 166
28-pin SOP (300mil) Outline Dimensions............................................................................ 167
28-pin SSOP (150mil) Outline Dimensions.......................................................................... 168
SAW Type 32-pin (5mm×5mm) QFN Outline Dimensions................................................... 169
Rev. 1.40
5
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Features
CPU Features
• Operating voltage
♦♦
fSYS = 8MHz: VLVR~5.5V
♦♦
fSYS = 12MHz: 2.7V~5.5V
♦♦
fSYS = 16MHz: 4.5V~5.5V
• Up to 0.25μs instruction cycle with 16MHz system clock at VDD=5V
• Power down and wake-up functions to reduce power consumption
• Three Oscillators
♦♦
High Speed Internal RC -- HIRC: 8/12/16MHz
♦♦
Low Speed Internal RC -- LIRC: 32kHz
♦♦
Low speed External Crystal -- LXT: 32768Hz (only for BS82C16A-3 and BS82D20A-3)
• 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 8-level subroutine nesting
• Bit manipulation instruction
Peripheral Features
• Flash Program Memory: 2K×16 ~ 8K×16
• RAM Data Memory: 384×8 ~ 768×8
• EEPROM Memory: 64×8
• Fully integrated 12/16/20 touch key functions -- require no external components
• Watchdog Timer function
• Up to 26 bidirectional I/O lines
• PMOS Source Current Adjustable
• Software controlled 4-SCOM lines LCD driver with 1/3 bias
• One external interrupt line shared with I/O pin
• Multiple Timer Module for time measure, input capture, compare match output, PWM output or
single pulse output function
• Dual Time-Base functions for generation of fixed time interrupt signals
• I2C Interface Module
• UART Interface
• Low voltage reset function
• Low voltage detect function
• Package:20/24/28-pinSOP,24/32-pin QFN, 28-pinSSOP
Rev. 1.40
6
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
General Description
These devices are a series of Flash Memory type 8-bit high performance RISC architecture
microcontrollers with fully integrated touch key functions. With all touch key functions provided
internally and with the convenience of Flash Memory multi-programming features, these devices
has all the features to offer designers a reliable and easy means of implementing Touch Keyes within
their products applications.
The touch key functions are fully integrated completely eliminating the need for external
components. In addition to the flash program memory, 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. Protective features such as an internal Watchdog Timer, Low
Voltage Reset and Low Voltage Detector functions coupled with excellent noise immunity and ESD
protection ensure that reliable operation is maintained in hostile electrical environments.
A full choice of HIRC, LIRC and LXT oscillators are provided including a fully intefrated system
oscillator which require no external components for their implementation. The ability to operate
and switch dynamically between a range of operating modes using different clock sources gives
users the ability to optimise microcontroller operation and minimise power consumption. Easy
communication with the outside world is provided using the fully integrated I2C interface functions,
while the inclusion of flexible I/O programming features, Timer Modules and many other features
further enhance device functionality and flexibility.
The UART module is contained in these devices. It can support the applications such as data
communication networks between microcontrollers, low-cost data links between PCs and peripheral
devices, portable and battery operated device communication, etc.
These touch key devices will find excellent use in a huge range of modern Touch Key product
applications such as instrumentation, household appliances, electronically controlled tools to name
but a few.
Selection Table
Most features are common to these devices, the main features distinguishing them are Memory
capacity, I/O count, LCD segment count, Touch Key count, stack capacity and package types. The
following table summarises the main features of each device.
Part No.
VDD
Program
Memory
Data
Memory
Data
EEPROM
I/O
Ext.
Int.
LCD
Driver
Timer
Module
Touch
Key
I2C
UART
Time
Base
Stack
Package
BS82B12A-3
2.7V~
5.5V
2K×16
384×8
64×8
22
1
16×4
10-bit
CTM×1
10-bit
PTM×1
12
√
√
2
6
20/24SOP
24QFN
BS82C16A-3
2.7V~
5.5V
4K×16
512×8
64×8
26
1
20×4
10-bit
CTM×1
10-bit
PTM×1
16
√
√
2
6
24/28SOP
32QFN
BS82D20A-3
2.7V~
5.5V
8K×16
768×8
64×8
26
1
20×4
10-bit
CTM×1
10-bit
PTM×1
20
√
√
2
8
24/28SOP
28SSOP
Rev. 1.40
7
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Block Diagram
Low
Voltage
Detect
Flash/EEPRO�
Programming Circuitr�
(ICP/OCDS)
EEPRO�
Data
�emor�
Flash
Program
�emor�
Watchdog
Timer
RA�
Data
�emor�
Low
Voltage
Reset
Reset
Circuit
8-bit
RISC
�CU
Core
Interrupt
Controller
LXT
Oscillator
Time
Bases
HIRC/LIRC
Oscillators
LED Driver
I�C
I/O
UART
Timer
�odules
LCD Driver
Touch Ke�s
Note: The LXT oscillator is only for the BS82C16A-3 and BS82D20A-3.
Pin Assignment
PB0/SSEG0/KEY1
PB1/SSEG1/KEY�
1
�0
PA3/SDA/RX
�
19
PB�/SSEG�/KEY3
3
18
PA0/TCK1/SCO��/ICPDA/OCDSDA
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
17
PA7/SCL/TX
PB4/SSEG4/KEY�
�
1�
VDD
PB�/SSEG�/KEY�
�
1�
VSS
PC0/SSEG8/KEY9
7
14
PA1/SCO�0
PC1/SSEG9/KEY10
8
13
PA4/INT/TCK0/SCO�1
PC�/SSEG10/KEY11
9
1�
PC�/TP0_0/SSEG13
PC3/SSEG11/KEY1�
10
11
PC4/TP1_0/SSEG1�
BS82B12A-3/BS82BV12A-3
20 SOP-A
PB0/SSEG0/KEY1
1
�4
PA3/SDA/RX
PB1/SSEG1/KEY�
�
�3
PA0/TCK1/SCO��/ICPDA/OCDSDA
PB�/SSEG�/KEY3
3
��
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
�1
PA7/SCL/TX
PB4/SSEG4/KEY�
�
�0
VDD
PB�/SSEG�/KEY�
�
19
VSS
PB�/SSEG�/KEY7
7
18
PA1/SCO�0
PB7/SSEG7/KEY8
8
17
PA4/INT/TCK0/SCO�1
PC0/SSEG8/KEY9
9
1�
PC7/TP0_1/SSEG1�
PC1/SSEG9/KEY10
10
1�
PC�/TP1_1/SSEG14
PC�/SSEG10/KEY11
11
14
PC�/TP0_0/SSEG13
PC3/SSEG11/KEY1�
1�
13
PC4/TP1_0/SSEG1�
BS82B12A-3/BS82BV12A-3
24 SOP-A
Rev. 1.40
8
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
PA�/SCO�3/ICPCK/OCDSCK
PA0/TCK1/SCO��/ICPDA/OCDSDA
PA3/SDA/RX
PB0/SSEG0/KEY1
PB1/SSEG1/KEY�
PB�/SSEG�/KEY3
�4 �3 �� 1 �0 19
18
1
�
17
BS82B12A-3
3
1�
BS82BV12A-3
4
24 QFN-A 1�
14
�
13
�
7 8 9 10 11 1�
PB3/SSEG3/KEY4
PB4/SSEG4/KEY�
PB�/SSEG�/KEY�
PB�/SSEG�/KEY7
PB7/SSEG7/KEY8
PC0/SSEG8/KEY9
PA7/SCL/TX
VDD
VSS
PA1/SCO�0
PA4/INT/TCK0/SCO�1
PC7/TP0_1/SSEG1�
PC�/TP1_1/SSEG14
PC�/TP0_0/SSEG13
PC4/TP1_0/SSEG1�
PC3/SSEG11/KEY1�
PC�/SSEG10/KEY11
PC1/SSEG9/KEY10
PB0/SSEG0/KEY1
1
�4
PA3/SDA/RX
PB1/SSEG1/KEY�
�
�3
PA0/TCK1/SCO��/ICPDA/OCDSDA
PB�/SSEG�/KEY3
3
��
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
�1
PA7/SCL/TX
PB4/SSEG4/KEY�
�
�0
VDD
PB�/SSEG�/KEY�
�
19
VSS
PB�/SSEG�/KEY7
7
18
PA1/SCO�0
PB7/SSEG7/KEY8
8
17
PA4/INT/TCK0/SCO�1
PC0/SSEG8/KEY9
9
1�
PC7/TP0_1/SSEG1�/KEY1�
PC1/SSEG9/KEY10
10
1�
PC�/TP1_1/SSEG14/KEY1�
PC�/SSEG10/KEY11
11
14
PC�/SSEG13/KEY14
PC3/SSEG11/KEY1�
1�
13
PC4/SSEG1�/KEY13
BS82C16A-3/BS82CV16A-3
24 SOP-A
Rev. 1.40
9
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
PB0/SSEG0/KEY1
1
�8
PA3/SDA/RX
PB1/SSEG1/KEY�
�
�7
PA0/TCK1/SCO��/ICPDA/OCDSDA
PB�/SSEG�/KEY3
3
��
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
��
PB4/SSEG4/KEY�
�
�4
PA7/SCL/TX
VDD
PB�/SSEG�/KEY�
�
�3
PD1/TP0_0/SSEG17/XT�
PB�/SSEG�/KEY7
7
��
PD0/TP1_0/SSEG1�/XT1
PB7/SSEG7/KEY8
8
�1
VSS
PD3/SSEG19
9
�0
PA1/SCO�0
PD�/SSEG18
10
19
PA4/INT/TCK0/SCO�1
PC0/SSEG8/KEY9
11
18
PC7/TP0_1/SSEG1�/KEY1�
PC1/SSEG9/KEY10
1�
17
PC�/TP1_1/SSEG14/KEY1�
PC�/SSEG10/KEY11
13
1�
PC�/SSEG13/KEY14
PC3/SSEG11/KEY1�
14
1�
PC4/SSEG1�/KEY13
BS82C16A-3/BS82CV16A-3
28 SOP-A
PA�/SCO�3/ICPCK/OCDSCK
PA0/TCK1/SCO��/ICPDA/OCDSDA
PA3/SDA/RX
NC
NC
PB0/SSEG0/KEY1
PB1/SSEG1/KEY�
PB�/SSEG�/KEY3
PB3/SSEG3/KEY4
PB4/SSEG4/KEY�
PB�/SSEG�/KEY�
PB�/SSEG�/KEY7
PB7/SSEG7/KEY8
PD3/SSEG19
PD�/SSEG18
PC0/SSEG8/KEY9
1
�
3
4
�
�
7
8
3� 31 30 �9 �8 �7 ��
�4
�3
��
BS82C16A-3
�1
BS82CV16A-3
�0
32 QFN-A
19
18
17
9 10111� 13 141� 1�
PA7/SCL/TX
VDD
PD1/TP0_0/SSEG17/XT�
PD0/TP1_0/SSEG1�/XT1
VSS
PA1/SCO�0
PA4/INT/TCK0/SCO�1
PC7/TP0_1/SSEG1�/KEY1�
PC�/TP1_1/SSEG14/KEY1�
PC�/SSEG13/KEY14
PC4/SSEG1�/KEY13
NC
NC
PC3/SSEG11/KEY1�
PC�/SSEG10/KEY11
PC1/SSEG9/KEY10
Rev. 1.40
10
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
PB0/SSEG0/KEY1
1
�4
PA3/SDA/RX
PB1/SSEG1/KEY�
�
�3
PA0/TCK1/SCO��/ICPDA/OCDSDA
PB�/SSEG�/KEY3
3
��
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
�1
PA7/SCL/TX
PB4/SSEG4/KEY�
�
�0
VDD
PB�/SSEG�/KEY�
�
19
VSS
PB�/SSEG�/KEY7
7
18
PA1/SCO�0/KEY�0
PB7/SSEG7/KEY8
8
17
PA4/INT/TCK0/SCO�1/KEY19
PC0/SSEG8/KEY11
9
1�
PC7/TP0_1/SSEG1�/KEY18
PC1/SSEG9/KEY1�
10
1�
PC�/TP1_1/SSEG14/KEY17
PC�/SSEG10/KEY13
11
14
PC�/SSEG13/KEY1�
PC3/SSEG11/KEY14
1�
13
PC4/SSEG1�/KEY1�
BS82D20A-3/BS82DV20A-3
24 SOP-A
PB0/SSEG0/KEY1
1
�8
PA3/SDA/RX
PB1/SSEG1/KEY�
�
�7
PA0/TCK1/SCO��/ICPDA/OCDSDA
PB�/SSEG�/KEY3
3
��
PA�/SCO�3/ICPCK/OCDSCK
PB3/SSEG3/KEY4
4
��
PA7/SCL/TX
PB4/SSEG4/KEY�
�
�4
VDD
PB�/SSEG�/KEY�
�
�3
PD1/TP0_0/SSEG17/XT�
PB�/SSEG�/KEY7
7
��
PD0/TP1_0/SSEG1�/XT1
PB7/SSEG7/KEY8
8
�1
VSS
PD3/SSEG19/KEY9
9
�0
PA1/SCO�0/KEY�0
PD�/SSEG18/KEY10
10
19
PA4/INT/TCK0/SCO�1/KEY19
PC0/SSEG8/KEY11
11
18
PC7/TP0_1/SSEG1�/KEY18
PC1/SSEG9/KEY1�
1�
17
PC�/TP1_1/SSEG14/KEY17
PC�/SSEG10/KEY13
13
1�
PC�/SSEG13/KEY1�
PC3/SSEG11/KEY14
14
1�
PC4/SSEG1�/KEY1�
BS82D20A-3/BS82DV20A-3
28 SOP-A/SSOP-A
Note: 1. If the pin-shared pin functions have multiple outputs simultaneously, its pin names at the right side of the
"/" sign can be used for higher priority.
2. The OCDSDA and OCDSCK pins are the OCDS dedicated pins and only available for the
BS82BV12A-3, BS82CV16A-3 and BS82DV20A-3 devices, which are the OCDS EV chips for the
BS82B12A-3, BS82C16A-3 and BS82D20A-3 devices respectively.
Rev. 1.40
11
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Descriptions
With the exception of the power pins and some relevant transformer control pins, all pins on the
device 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 Touch
Key function, Timer Modules, etc. The function of each pin is listed in the following tables, however
the details behind how each pin is configured is contained in other sections of the datasheet.
As the Pin Description table shows the situation for the package with the most pins, not all pins in
the table will be available on smaller package sizes.
BS82B12A-3
Pin Name
PA0/TCK1/
SCOM2/
ICPDA/
OCDSDA
PA1/SCOM0
PA2/
SCOM3/
ICPCK/
OCDSCK
PA3/SDA/
RX
PA4/INT/
TCK0/
SCOM1
PA7/SCL/TX
PB0/
SSEG0/
KEY1
PB1/
SSEG1/
KEY2
Rev. 1.40
Function
OP
I/T
PA0
PAWU
PAPU
ST
O/T
Description
CMOS General purpose I/O. Register enabled pull-up and wake-up.
TCK1
PTM0C0
ST
SCOM2
SLCDC0
—
SCOM LCD driver output for LCD panel common
—
ICPDA
—
ST
CMOS In-circuit programming address/data pin
OCDSDA
—
ST
CMOS On-chip debug support data/address pin, for EV chip only.
PA1
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM0
SLCDC0
—
SCOM LCD driver output for LCD panel common
PA2
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM3
SLCDC0
—
SCOM LCD driver output for LCD panel common
ICPCK
—
ST
—
In-circuit programming clock pin
OCDSCK
—
ST
—
On-chip debug support clock pin, for EV chip only.
PA3
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SDA
IICC0
ST
NMOS I2C Data
RX
UCR1
ST
PA4
PAWU
PAPU
ST
INT
INTC0
INTEG
ST
—
External interrupt
TCK0
CTM0C0
ST
—
CTM0 clock input
SCOM1
SLCDC0
—
SCOM LCD driver output for LCD panel common
PA7
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCL
IICC0
ST
NMOS I2C Clock
TX
UCR1
—
CMOS UART transmitter data output
—
PTM0 clock input
UART receiver data input
CMOS General purpose I/O. Register enabled pull-up and wake-up.
PB0
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG0
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY1
TKM0C1
NSI
PB1
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG1
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY2
TKM0C1
NSI
—
—
Touch key input
Touch key input
12
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Name
PB2/
SSEG2/
KEY3
Function
OP
I/T
PB2
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
O/T
SSEG2
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY3
TKM0C1
NSI
ST
CMOS General purpose I/O. Register enabled pull-up.
CMOS LCD driver output for LCD panel segment
—
Description
Touch key input
PB3/
SSEG3/
KEY4
PB3
PBPU
SSEG3
SLCDC1
—
KEY4
TKM0C1
NSI
PB4/
SSEG4/
KEY5
PB4
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG4
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY5
TKM1C1
NSI
PB5/
SSEG5/
KEY6
PB5
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG5
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY6
TKM1C1
NSI
PB6/
SSEG6/
KEY7
PB6
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG6
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY7
TKM1C1
NSI
PB7/
SSEG7/
KEY8
PB7
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG7
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY8
TKM1C1
NSI
PC0/
SSEG8/
KEY9
PC0
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG8
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY9
TKM2C1
NSI
PC1/
SSEG9/
KEY10
PC1
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG9
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY10
TKM2C1
NSI
PC2
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG10
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY11
TKM2C1
NSI
PC3
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG11
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY12
TKM2C1
NSI
PC2/
SSEG10/
KEY11
PC3/
SSEG11/
KEY12
PC4/TP1_0/
SSEG12
PC5/TP0_0/
SSEG13
PC6/TP1_1/
SSEG14
PC7/TP0_1/
SSEG15
Rev. 1.40
—
—
—
—
—
—
—
—
—
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
PC4
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_0
TMPC
—
CMOS PTM0 output
SSEG12
SLCDC2
—
CMOS LCD driver output for LCD panel segment
PC5
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP0_0
TMPC
—
CMOS CTM0 output
SSEG13
SLCDC2
—
CMOS LCD driver output for LCD panel segment
PC6
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_1
TMPC
—
CMOS PTM0 output
SSEG14
SLCDC2
—
CMOS LCD driver output for LCD panel segment
PC7
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP0_1
TMPC
—
CMOS CTM0 output
SSEG15
SLCDC2
—
CMOS LCD driver output for LCD panel segment
13
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Function
OP
I/T
O/T
VDD
Pin Name
VDD
—
PWR
—
Power supply
Description
VSS
VSS
—
PWR
—
Ground
Note: I/T: Input type;
O/T: Output type
OP: Optional by configuration option (CO) or register selection
PWR: Power;
ST: Schmitt Trigger input
CMOS: CMOS output;
NMOS: NMOS output;
SCOM: SCOM output
AN: Analog input; NSI: Non-standard input
The PTM pin names and output pin control bits use "1" as their serial number, but other PTM related regiter
names or bit names use "0".
BS82C16A-3
Pin Name
PA0/TCK1/
SCOM2/
ICPDA/
OCDSDA
PA1/SCOM0
PA2/
SCOM3/
ICPCK/
OCDSCK
PA3/SDA/
RX
PA4/INT/
TCK0/
SCOM1
PA7/SCL/TX
Function
OP
I/T
O/T
Description
PA0
PAWU
PAPU
ST
TCK1
PTM0C0
ST
SCOM2
SLCDC0
—
SCOM LCD driver output for LCD panel common
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
PTM0 clock input
ICPDA
—
ST
CMOS In-circuit programming address/data pin
OCDSDA
—
ST
CMOS On-chip debug support data/address pin, for EV chip only.
PA1
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM0
SLCDC0
—
SCOM LCD driver output for LCD panel common
PA2
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM3
SLCDC0
—
SCOM LCD driver output for LCD panel common
ICPCK
—
ST
—
In-circuit programming clock pin
OCDSCK
—
ST
—
On-chip debug support clock pin, for EV chip only.
PA3
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SDA
IICC0
ST
NMOS I2C Data
RX
UCR1
ST
PA4
PAWU
PAPU
ST
INT
INTC0
INTEG
ST
—
UART receiver data input
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
External interrupt
—
CTM0 clock input
TCK0
CTM0C0
ST
SCOM1
SLCDC0
—
SCOM LCD driver output for LCD panel common
PA7
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCL
IICC0
ST
NMOS I2C Clock
TX
UCR1
—
CMOS UART transmitter data output
PB0/
SSEG0/
KEY1
PB0
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG0
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY1
TKM0C1
NSI
PB1/
SSEG1/
KEY2
PB1
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG1
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY2
TKM0C1
NSI
Rev. 1.40
—
—
Touch key input
Touch key input
14
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Name
PB2/
SSEG2/
KEY3
Function
OP
I/T
PB2
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
O/T
SSEG2
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY3
TKM0C1
NSI
ST
CMOS General purpose I/O. Register enabled pull-up.
CMOS LCD driver output for LCD panel segment
—
Description
Touch key input
PB3/
SSEG3/
KEY4
PB3
PBPU
SSEG3
SLCDC1
—
KEY4
TKM0C1
NSI
PB4/
SSEG4/
KEY5
PB4
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG4
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY5
TKM1C1
NSI
PB5/
SSEG5/
KEY6
PB5
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG5
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY6
TKM1C1
NSI
PB6/
SSEG6/
KEY7
PB6
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG6
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY7
TKM1C1
NSI
PB7/
SSEG7/
KEY8
PB7
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG7
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY8
TKM1C1
NSI
PC0/
SSEG8/
KEY9
PC0
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG8
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY9
TKM2C1
NSI
PC1/
SSEG9/
KEY10
PC1
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG9
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY10
TKM2C1
NSI
PC2
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG10
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY11
TKM2C1
NSI
ST
CMOS General purpose I/O. Register enabled pull-up.
CMOS LCD driver output for LCD panel segment
PC2/
SSEG10/
KEY11
—
—
—
—
—
—
—
—
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
PC3/
SSEG11/
KEY12
PC3
PCPU
SSEG11
SLCDC2
—
KEY12
TKM2C1
NSI
PC4/
SSEG12/
KEY13
PC4
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG12
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY13
TKM3C1
NSI
PC5
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG13
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY14
TKM3C1
NSI
PC5/
SSEG13/
KEY14
PC6/TP1_1/
SSEG14/
KEY15
Rev. 1.40
—
—
—
Touch key input
Touch key input
Touch key input
PC6
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_1
TMPC
—
CMOS PTM0 output
SSEG14
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY15
TKM3C1
NSI
—
Touch key input
15
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Name
PC7/TP0_1/
SSEG15/
KEY16
PD0/TP1_0/
SSEG16/
XT1
PD1/TP0_0/
SSEG17/
XT2
PD2/
SSEG18
PD3/
SSEG19
Function
OP
I/T
PC7
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
O/T
Description
TP0_1
TMPC
—
CMOS CTM0 output
SSEG15
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY16
TKM3C1
NSI
—
Touch key input
PD0
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_0
TMPC
—
CMOS PTM0 output
SSEG16
SLCDC3
—
CMOS LCD driver output for LCD panel segment
XT1
CO
LXT
—
LXT pin
PD1
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP0_0
TMPC
—
CMOS CTM0 output
SSEG17
SLCDC3
—
CMOS LCD driver output for LCD panel segment
XT2
CO
—
LXT
LXT pin
PD2
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG18
SLCDC3
—
CMOS LCD driver output for LCD panel segment
PD3
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
CMOS LCD driver output for LCD panel segment
SSEG19
SLCDC3
—
VDD
VDD
—
PWR
—
Power supply
VSS
VSS
—
PWR
—
Ground
Note: I/T: Input type;
O/T: Output type;
OP: Optional by configuration option (CO) or register selection;
PWR: Power;
ST: Schmitt Trigger input; CMOS: CMOS output;
NMOS: NMOS output;
SCOM: SCOM output;
AN: Analog input;
NSI: Non-standard input;
LXT: Low frequency crystal oscillator;
The PTM pin names and output pin control bits use "1" as their serial number, but other PTM related regiter
names or bit names use "0".
BS82D20A-3
Pin Name
PA0/TCK1/
SCOM2/
ICPDA/
OCDSDA
PA1/
SCOM0/
KEY20
PA2/
SCOM3/
ICPCK/
OCDSCK
Rev. 1.40
Function
OP
I/T
PA0
PAWU
PAPU
O/T
Description
ST
TCK1
PTM0C0
ST
SCOM2
SLCDC0
—
SCOM LCD driver output for LCD panel common
ICPDA
—
ST
CMOS In-circuit programming address/data pin
OCDSDA
—
ST
CMOS On-chip debug support data/address pin, for EV chip only.
PA1
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM0
SLCDC0
—
SCOM LCD driver output for LCD panel common
KEY20
TKM4C1
NSI
PA2
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM3
SLCDC0
—
SCOM LCD driver output for LCD panel common
ICPCK
—
ST
—
In-circuit programming clock pin
OCDSCK
—
ST
—
On-chip debug support clock pin, for EV chip only.
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
—
PTM0 clock input
Touch key input
16
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Name
PA3/SDA/RX
PA4/INT/
TCK0/
SCOM1/
KEY19
PA7/SCL/TX
Function
OP
I/T
PA3
PAWU
PAPU
O/T
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SDA
IICC0
ST
NMOS I2C Data
RX
UCR1
ST
PA4
PAWU
PAPU
ST
INT
INTC0
INTEG
ST
—
External interrupt
TCK0
CTM0C0
ST
—
CTM0 clock input
SCOM1
SLCDC0
—
KEY19
TKM4C1
NSI
PA7
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCL
IICC0
ST
NMOS I2C Clock
—
Description
UART receiver data input
CMOS General purpose I/O. Register enabled pull-up and wake-up.
SCOM LCD driver output for LCD panel common
—
Touch key input
TX
UCR1
—
CMOS UART transmitter data output
PB0/SSEG0/
KEY1
PB0
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG0
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY1
TKM0C1
NSI
PB1/SSEG1/
KEY2
PB1
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG1
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY2
TKM0C1
NSI
PB2/SSEG2/
KEY3
PB2
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG2
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY3
TKM0C1
NSI
PB3/SSEG3/
KEY4
PB3
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG3
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY4
TKM0C1
NSI
PB4/SSEG4/
KEY5
PB4
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG4
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY5
TKM1C1
NSI
PB5
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG5
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY6
TKM1C1
NSI
PB6/SSEG6/
KEY7
PB6
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG6
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY7
TKM1C1
NSI
PB7/SSEG7/
KEY8
PB7
PBPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG7
SLCDC1
—
CMOS LCD driver output for LCD panel segment
KEY8
TKM1C1
NSI
PC0
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG8
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY11
TKM2C1
NSI
PC1
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
SSEG9
SLCDC2
—
CMOS LCD driver output for LCD panel segment
KEY12
TKM2C1
NSI
PB5/SSEG5/
KEY6
PC0/SSEG8/
KEY11
PC1/SSEG9/
KEY12
Rev. 1.40
—
—
—
—
—
—
—
—
—
—
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
Touch key input
17
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Pin Name
PC2/
SSEG10/
KEY13
Function
OP
I/T
PC2
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
SSEG10 SLCDC2
TKM2C1
NSI
PC3
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
SSEG11 SLCDC2
PC4/
SSEG12/
KEY15
SSEG12 SLCDC2
PC6/TP1_1/
SSEG14/
KEY17
PC7/TP0_1/
SSEG15/
KEY18
PD0/TP1_0/
SSEG16/
XT1
PD1/TP0_0/
SSEG17/
XT2
PD2/
SSEG18/
KEY10
PD3/
SSEG19/
KEY9
—
Description
KEY13
PC3/
SSEG11/
KEY14
PC5/
SSEG13/
KEY16
O/T
—
Touch key input
KEY14
TKM3C1
NSI
PC4
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
KEY15
TKM3C1
NSI
PC5
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
SSEG13 SLCDC2
KEY16
—
Touch key input
TKM3C1
NSI
PC6
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_1
TMPC
—
CMOS PTM0 output
—
CMOS LCD driver output for LCD panel segment
SSEG14 SLCDC2
—
Touch key input
KEY17
TKM4C1
NSI
PC7
PCPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP0_1
TMPC
—
CMOS CTM0 output
—
CMOS LCD driver output for LCD panel segment
SSEG15 SLCDC2
—
Touch key input
KEY18
TKM4C1
NSI
PD0
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP1_0
TMPC
—
CMOS PTM0 output
—
CMOS LCD driver output for LCD panel segment
SSEG16 SLCDC3
—
Touch key input
XT1
CO
LXT
PD1
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
TP0_0
TMPC
—
CMOS CTM0 output
—
CMOS LCD driver output for LCD panel segment
SSEG17 SLCDC3
—
Touch key input
XT2
CO
—
PD2
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
SSEG18 SLCDC3
LXT
LXT pin
KEY10
TKM2C1
NSI
PD3
PDPU
ST
CMOS General purpose I/O. Register enabled pull-up.
—
CMOS LCD driver output for LCD panel segment
SSEG19 SLCDC3
—
LXT pin
Touch key input
KEY9
TKM2C1
NSI
—
Touch key input
VDD
VDD
—
PWR
—
Power supply
VSS
VSS
—
PWR
—
Ground
Note: I/T: Input type;
O/T: Output type
OP: Optional by configuration option (CO) or register selection
PWR: Power;
ST: Schmitt Trigger input
CMOS: CMOS output;
NMOS: NMOS output
AN: Analog input; NSI: Non-standard input;
SCOM: SCOM output
LXT: Low frequency crystal oscillator
The PTM pin names and output pin control bits use "1" as their serial number, but other PTM related regiter
names or bit names use "0".
Rev. 1.40
18
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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.
D.C. Characteristics
Symbol
VDD
Parameter
Operating Voltage (HIRC)
Ta=25°C
Test Conditions
—
3V
5V
Operating Current (Normal)
(HIRC, fSYS=fH, fS=fSUB)
3V
5V
3V
5V
3V
5V
3V
5V
3V
IDD
Operating Current (Normal)
(HIRC, fSYS=fL, fS=fSUB)
5V
3V
5V
3V
5V
5V
3V
3V
5V
Operating Current (Slow)
(LXT/LIRC, fSYS=fL, fS=fSUB)
3V
5V
3V
5V
Rev. 1.40
Min.
Typ.
Max.
Unit
fSYS = 8MHz
2.7
—
5.5
V
fSYS = 12MHz
2.7
—
5.5
V
fSYS = 16MHz
4.5
—
5.5
V
No load, fH = 8MHz,
WDT enable
—
1.2
1.8
mA
—
2.2
3.3
mA
No load, fH = 12MHz,
WDT enable
—
1.6
2.4
mA
—
3.3
5.0
mA
No load, fH = 16MHz,
WDT enable
—
2.0
3.0
mA
—
4.0
6.0
mA
No load, fH =12MHz,
fL= fH/2, WDT enable
—
1.2
2.0
mA
—
2.2
3.3
mA
No load, fH =12MHz,
fL= fH/4, WDT enable
—
1.0
1.5
mA
—
1.8
2.7
mA
No load, fH =12MHz,
fL= fH/8, WDT enable
—
0.9
1.4
mA
—
1.6
2.4
mA
No load, fH =12MHz,
fL= fH/16, WDT enable
—
0.8
1.2
mA
—
1.5
2.3
mA
No load, fH =12MHz,
fL= fH/32, WDT enable
—
0.8
1.2
mA
—
1.5
2.3
mA
No load, fH =12MHz,
fL= fH/64, WDT enable
—
0.8
1.2
mA
—
1.5
2.3
mA
No load, fSYS=LXT,
WDT enable, LXTLP=0
—
19
38
μA
—
48
96
μA
No load, fSYS=LXT,
WDT enable, LXTLP=1
—
16
32
μA
—
36
72
μA
No load, fSYS=LIRC,
WDT enable
—
10
20
μA
—
30
50
μA
VDD
Conditions
19
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Symbol
ISTB
Parameter
Test Conditions
No load, system HALT, WDT
enable, fSYS = 12MHz
—
0.9
1.4
mA
—
1.4
2.1
mA
No load, system HALT, WDT
enable, fSYS = 12MHz
—
1.4
3.0
μA
—
2.7
5.0
μA
No load, system HALT, WDT
enable, fSYS = 12MHz/64
—
0.7
1.1
mA
—
1.4
2.1
mA
No load, system HALT, WDT
enable, fSYS = 12MHz/64
—
1.3
3.0
μA
—
2.3
5.0
μA
No load, system HALT, WDT
enable, fSYS = LIRC
—
1.9
4.0
μA
—
3.3
7.0
μA
No load, system HALT, WDT
enable, LXTLP=0 (LXT on)
—
5
10
μA
—
18
30
μA
No load, system HALT, WDT
enable, LXTLP=1 (LXT on)
—
2.5
5
μA
—
6
10
μA
No load, system HALT, WDT
enable (LIRC on)
—
1.3
3.0
μA
—
2.4
5.0
μA
No load, system HALT, WDT
disable (LXT and LIRC off)
—
0.1
1
μA
—
0.3
2
μA
No load, system HALT, WDT
disable (LXT and LIRC off)
—
0.1
1
μA
—
0.3
2
μA
0
—
1.5
V
0
—
0.2VDD
V
3.5
—
5.0
V
IDLE0 Mode Standby Current
(HIRC, fSYS=off, fS=fSUB)
3V
IDLE1 Mode Standby Current
(HIRC, fSYS= fL, fS=fSUB)
3V
IDLE0 Mode Standby Current
(HIRC, fSYS=off, fS=fSUB)
3V
IDLE1 Mode Standby Current
(LIRC, fSYS=fL=fLIRC, fS=fSUB=fLIRC)
3V
5V
5V
5V
5V
5V
3V
3V
5V
5V
SLEEP Mode Standby Current
(HIRC, fSYS=off, fS=fSUB=off)
3V
SLEEP Mode Standby Current
(LXT/LIRC, fSYS=off, fS=fSUB=off)
3V
VIL
Input Low Voltage for I/O Ports
or Input Pins
5V
VIH
Input High Voltage for I/O Ports
or Input Pins
5V
VLVR
Low Voltage Reset Voltage
—
Rev. 1.40
Unit
3V
3V
IOH
Max.
IDLE1 Mode Standby Current
(HIRC, fSYS=fH, fS=fSUB)
IDLE0 Mode Standby Current
(LXT/LIRC, fSYS=off, fS=fSUB)
IOL
Typ.
Conditions
5V
VLVD
Min.
VDD
Low Voltage Detector Voltage
I/O Port Sink Current
I/O Port Source Current
5V
5V
—
—
—
—
—
0.8VDD
—
VDD
V
LVR enable, 2.55V
-5%
2.55
+5%
V
LVDEN = 1, VLVD = 2.7V
-5%
2.7
+5%
V
LVDEN = 1, VLVD = 3.0V
-5%
3.0
+5%
V
LVDEN = 1, VLVD = 3.3V
-5%
3.3
+5%
V
LVDEN = 1, VLVD = 3.6V
-5%
3.6
+5%
V
LVDEN = 1, VLVD = 4.0V
-5%
4.0
+5%
V
3V
VOL=0.1VDD
16
32
—
mA
5V
VOL=0.1VDD
32
64
—
mA
3V
VOH = 0.9VDD, PxPS=00
-1.0
-2.0
—
mA
5V
VOH = 0.9VDD, PxPS=00
-2.0
-4.0
—
mA
3V
VOH = 0.9VDD, PxPS=01
-1.75
-3.5
—
mA
5V
VOH = 0.9VDD, PxPS=01
-3.5
-7.0
—
mA
3V
VOH = 0.9VDD, PxPS=10
-2.5
-5.0
—
mA
5V
VOH = 0.9VDD, PxPS=10
-5.0
-10
—
mA
3V
VOH = 0.9VDD, PxPS=11
-5.5
-11
—
mA
5V
VOH = 0.9VDD, PxPS=11
-11
-22
—
mA
20
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Symbol
Parameter
RPH
Pull-high Resistance for I/O
Ports
VBG
Bandgap Reference with Buffer
Voltage
Test Conditions
Min.
Typ.
Max.
Unit
—
20
60
100
kΩ
5V
—
10
30
50
kΩ
—
—
-3%
1.09
+3%
V
VDD
Conditions
3V
A.C. Characteristics
Ta=25°C
Symbol
fSYS
Parameter
System Clock (HIRC)
Test Conditions
VDD
Conditions
3V/5V Ta=25°C
Typ.
Max.
Unit
-2%
8
+2%
MHz
-2%
12
+2%
MHz
-2%
16
+2%
MHz
0.3
—
—
μs
-10%
32
+10%
kHz
—
32768
—
Hz
tTIMER
Timer Input Pulse Width
—
fLIRC
System Clock (32kHz)
5V
fLXT
System Clock (LXT)
—
—
tINT
Interrupt Pulse Width
—
—
1
5
10
μs
tLVR
Low Voltage Width to Reset
—
—
120
240
480
μs
tLVD
Low Voltage Width to Interrupt
—
—
60
120
240
μs
tLVDS
LVDO stable time
—
—
—
—
15
μs
tEERD
EEPROM Read Time
—
—
1
2
4
tSYS
tEEWR
EEPROM Write Time
—
—
1
2
4
ms
—
—
25
50
100
ms
tRSTD
System Reset Delay Time
(Power on reset, LVR reset,
WDT S/W reset (WDTC))
System Reset Delay Time
(WDT normal reset)
—
—
8.3
16.7
33.3
ms
System Start-up Timer Period
(Wake-up from HALT)
—
tSST
System Start-up Timer Period
(Wake-up from HALT, fSYS on at
HALT state)
—
Min.
Ta=25°C
fSYS=LXT
1024
—
—
fSYS=HIRC
16
—
—
fSYS=LIRC
2
—
—
2
—
—
—
—
tSYS
Note: tSYS = 1/fSYS
Rev. 1.40
21
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Sensor Oscillator Electrical Characteristics
Ta=25°C
Touch Key RC OSC = 500kHz
Symbol
Parameter
Test Conditions
VDD
3V
IKEYOSC
Only Sensor (KEY) Oscillator
Operating Current
Typ. Max. Unit
30
60
—
60
120
—
40
80
—
80
160
*fREFOSC=500kHz,
MnTSS=0, MnFILEN=0
—
30
60
—
60
120
*fREFOSC=500kHz,
MnTSS=0, MnFILEN=1
—
30
60
—
60
120
*fREFOSC=500kHz,
MnTSS=1, MnFILEN=0
—
30
60
—
60
120
—
40
80
5V
*fREFOSC=500kHz,
MnTSS=1, MnFILEN=1
—
80
160
5V
3V
3V
5V
3V
IREFOSC
Min.
—
5V
Only Reference Oscillator
Operating Current
Condition
5V
3V
5V
3V
*fSENOSC=500kHz, MnFILEN=0
*fSENOSC=500kHz, MnFILEN=1
μA
μA
μA
μA
μA
μA
CKEYOSC
Sensor (KEY) Oscillator
External Capacitance
5V
*fSENOSC=500kHz
5
10
20
pF
CREFOSC
Reference Oscillator Internal
Capacitance
5V
*fSENOSC=500kHz
5
10
20
pF
fKEYOSC
Sensor (KEY) Oscillator
Operating Frequency
5V
*External Capacitance
=7,8,9,10,11,12,13,14,15, … 50pF
100
500
1000
kHz
fREFYOSC
Reference Oscillator
Operating Frequency
5V
*Internal Capacitance
=7,8,9,10,11,12,13,14,15, … 50pF
100
500
1000
kHz
Note: *fSENOSC=500kHz: adjust the KEYn capacitor to make the Sensor Oscillator frequency =500kHz.
*fREFOSC=500kHz: adjust the Reference Oscillator internal capacitor to make the Reference Oscillator
frequency =500kHz.
Rev. 1.40
22
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key RC OSC = 1000kHz
Symbol
Parameter
Test Conditions
VDD
3V
IKEYOSC
Only Sensor (KEY) Oscillator
Operating Current
40
80
—
80
160
—
60
120
—
100
200
*fREFOSC=1000kHz,
MnTSS=0, MnFILEN=0
—
40
80
—
80
160
*fREFOSC=1000kHz,
MnTSS=0, MnFILEN=1
—
40
80
—
80
160
*fREFOSC=1000kHz,
MnTSS=1, MnFILEN=0
—
40
80
—
80
160
—
60
120
5V
*fREFOSC=1000kHz,
MnTSS=1, MnFILEN=1
—
150
300
3V
3V
5V
3V
Only Reference Oscillator
Operating Current
Min. Typ. Max. Unit
—
5V
5V
IREFOSC
Condition
5V
3V
5V
3V
*fSENOSC=1000kHz, MnFILEN=0
*fSENOSC=1000kHz, MnFILEN=1
μA
μA
μA
μA
μA
μA
CKEYOSC
Sensor (KEY) Oscillator
External Capacitance
5V
*fSENOSC=1000kHz
5
10
20
pF
CREFOSC
Reference Oscillator Internal
Capacitance
5V
*fSENOSC=1000kHz
5
10
20
pF
fKEYOSC
Sensor (KEY) Oscillator
Operating Frequency
5V
*External Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
1000 2500
kHz
fREFYOSC
Reference Oscillator
Operating Frequency
5V
*Internal Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
1000 2500
kHz
Note: *fSENOSC=1000kHz: adjust the KEYn capacitor to make the Sensor Oscillator frequency =1000kHz.
*fREFOSC=1000kHz: adjust the Reference Oscillator internal capacitor to make the Reference Oscillator
frequency =1000kHz.
Rev. 1.40
23
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key RC OSC =1500kHz
Symbol
Parameter
Test Conditions
VDD
3V
IKEYOSC
Only Sensor (KEY) Oscillator
Operating Current
5V
3V
5V
3V
5V
3V
IREFOSC
Only Reference Oscillator
Operating Current
5V
3V
5V
3V
5V
CKEYOSC
Sensor (KEY) Oscillator
External Capacitance
CREFOSC
Reference Oscillator Internal
Capacitance
fKEYOSC
Sensor (KEY) Oscillator
Operating Frequency
fREFYOSC
Reference Oscillator
Operating Frequency
3V
5V
3V
5V
3V
5V
3V
5V
Condition
Min. Typ. Max. Unit
—
60
120
—
120
240
—
90
180
—
150
300
*fREFOSC=1500kHz,
MnTSS=0, MnFILEN=0
—
60
120
—
120
240
*fREFOSC=1500kHz,
MnTSS=0, MnFILEN=1
—
60
120
—
120
240
*fREFOSC=1500kHz,
MnTSS=1, MnFILEN=0
—
60
120
—
120
240
*fREFOSC=1500kHz,
MnTSS=1, MnFILEN=1
—
90
180
—
225
450
4
8
16
5
10
20
4
8
16
5
10
20
*fSENOSC=1500kHz, MnFILEN=0
*fSENOSC=1500kHz, MnFILEN=1
*fSENOSC=1500kHz
*fSENOSC=1500kHz
*External Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
1500 3000
150
1500 3000
*Internal Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
1500 3000
150
1500 3000
μA
μA
μA
μA
μA
μA
pF
pF
kHz
kHz
Note: *fSENOSC=1500kHz: adjust the KEYn capacitor to make the Sensor Oscillator frequency =1500kHz.
*fREFOSC=1500kHz: adjust the Reference Oscillator internal capacitor to make the Reference Oscillator
frequency =1500kHz.
Rev. 1.40
24
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key RC OSC =2000kHz
Symbol
Parameter
Test Conditions
VDD
3V
IKEYOSC
Only Sensor (KEY) Oscillator
Operating Current
5V
3V
5V
3V
5V
3V
IREFOSC
Only Reference Oscillator
Operating Current
5V
3V
5V
3V
5V
CKEYOSC
Sensor (KEY) Oscillator
External Capacitance
3V
CREFOSC
Reference Oscillator Internal
Capacitance
3V
fKEYOSC
Sensor (KEY) Oscillator
Operating Frequency
3V
fREFYOSC
Reference Oscillator
Operating Frequency
3V
5V
5V
5V
5V
Min. Typ. Max. Unit
Condition
—
80
160
—
160
320
—
120
240
—
200
400
*fREFOSC=2000kHz,
MnTSS=0, MnFILEN=0
—
80
160
—
160
320
*fREFOSC=2000kHz,
MnTSS=0, MnFILEN=1
—
80
160
—
160
320
*fREFOSC=2000kHz,
MnTSS=1, MnFILEN=0
—
80
160
—
160
320
*fREFOSC=2000kHz,
MnTSS=1, MnFILEN=1
—
120
240
—
300
600
4
8
16
5
10
20
4
8
16
5
10
20
*fSENOSC=2000kHz, MnFILEN=0
*fSENOSC=2000kHz, MnFILEN=1
*fSENOSC=2000kHz
*fSENOSC=2000kHz
*External Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
2000 4000
150
2000 4000
*Internal Capacitance
=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
… 50pF
150
2000 4000
150
2000 4000
μA
μA
μA
μA
μA
μA
pF
pF
kHz
kHz
Note: *fSENOSC=2000kHz: adjust the KEYn capacitor to make the Sensor Oscillator frequency =2000kHz.
*fREFOSC=2000kHz: adjust the Reference Oscillator internal capacitor to make the Reference Oscillator
frequency =2000kHz
Power-on Reset Characteristics
Symbol
Test Conditions
Parameter
VDD
Conditions
Min.
Typ. Max. Unit
VPOR
VDD Start Voltage to eEnsure Power-on Reset
—
—
—
—
100
mV
RRVDD
VDD Raising 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. 1.40
25
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
System Architecture
A key factor in the high-performance features of the Holtek range of microcontrollers is attributed
to their internal system architecture. The range of devices take 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
control system with maximum reliability and flexibility. This makes these devices suitable for lowcost, high-volume production for controller applications.
Clocking and Pipelining
The main system clock, derived from either a LXT, 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
Rev. 1.40
26
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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.

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
BS82B12A-3
PCL Register
PC10~PC8
BS82C16A-3
PC11~PC8
BS82D20A-3
PC12~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.
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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
B o tto m
S ta c k L e v e l 1
S ta c k L e v e l 2
S ta c k
P o in te r
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
BS82B12A-3
6
BS82C16A-3
6
BS82D20A-3
8
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
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Touch 8-Bit Flash MCU with LED/LCD Driver
Flash Program Memory
The Program Memory is the location where the user code or program is stored. For this device
series the Program Memory is 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 2K×16 bits to 8K×16 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.
Device
Capacity
BS82B12A-3
2K×16
BS82C16A-3
4K×16
BS82D20A-3
8K×16
BS8�B1�A-3 BS8�C1�A-3
0000H
0004H
0030H
07FFH
BS8�D�0A-3
Reset
Reset
Reset
Interrupt
Vector
Interrupt
Vector
Interrupt
Vector
1� bits
0FFFH
1� bits
1FFFH
1� bits
Program Memory Structure
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Special Vectors
Within the Program Memory, certain locations are reserved for the reset and interrupts. The location
0000H is reserved for use by the device 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 and TBHP. These registers
define the total address of the look-up table.
After setting up the table pointer pair, 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.
A d d re s s
L a s t p a g e o r
T B H P R e g is te r
T B L P R e g is te r
D a ta
1 6 b its
R e g is te r T B L H
U s e r S e le c te d
R e g is te r
H ig h B y te
L o w B y te
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 "0700H" which refers to the
start address of the last page within the 2K words Program Memory of the BS82B12A-3. 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 "0706H" 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 specific
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.
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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
mov a,07h ; initialise high table pointer
mov tbhp,a
:
:
tabrd tempreg1 ; transfers value in table referenced by table pointer,
; data at program memory address "0706H" 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 "F05H" transferred to tempreg2 and TBLH
; in this example the data "1AH" is transferred to tempreg1 and data "0FH" to
; register tempreg2
:
:
org 0700h ; sets initial address of program memory
dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
:
:
In Circuit Programming – ICP
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.
The Holtek Flash MCU to Writer Programming Pin correspondence table is as follows:
Holtek Write Pins
MCU Programming Pins
ICPDA
PA0
Serial data/address input/output
Function
ICPCK
PA2
Serial Clock input
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. 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.
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Touch 8-Bit Flash MCU with LED/LCD Driver
During the programming process the PA0 and PA2 I/O pins for data and clock programming
purposes. The user must there take care to ensure that no other outputs are connected to these two
pins.
W r ite r C o n n e c to r
S ig n a ls
M C U
W r ite r _ V D D
V D D
IC P D A
P A 0
IC P C K
P A 2
W r ite r _ V S S
V S S
*
P r o g r a m m in g
P in s
*
T o o th e r C ir c u it
Note: * may be resistor or capacitor. The resistance of * must be greater than 1k or the capacitance
of * must be less than 1nF.
On-Chip Debug Support – OCDS
There are three EV chips named BS82BV12A-3, BS82CV16A-3 and BS82DV20A-3 which are
used to emulate the BS82B12A-3, BS82C16A-3 and BS82D20A-3 devices respectively. Each EV
chip device also provides an "On-Chip Debug" function to debug the corresponding MCU device
during the development process. The EV chip and the actual MCU device are almost functionally
compatible except for the "On-Chip 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 HTIDE 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".
Rev. 1.40
Holtek e-Link Pins
EV Chip Pins
OCDSDA
OCDSDA
On-chip Debug Support Data/Address input/output
OCDSCK
OCDSCK
On-chip Debug Support Clock input
VDD
VDD
Power Supply
GND
VSS
Ground
32
Pin Description
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 types, 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 several banks for the devices. The Special Purpose
Data Memory registers addressed from 00H~7FH in Data Memory are common and 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 sectors 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.
Memory Type
Special Function
Data Memory
General purpose
Data Memory
Device
Capacity
BS82B12A-3
Bank 0~2: 00H~7FH
EEC register at 40H only accessible in Bank 1
BS82C16A-3
Bank 0~3: 00H~7FH
EEC register at 40H only accessible in Bank 1
BS82D20A-3
Bank 0~5: 00H~7FH
EEC register at 40H only accessible in Bank 1
BS82B12A-3
384×8
Bank 0: 80H~FFH
Bank 1: 80H~FFH
Bank 2: 80H~FFH
BS82C16A-3
512×8
Bank 0: 80H~FFH
Bank 1: 80H~FFH
Bank 2: 80H~FFH
Bank 3: 80H~FFH
768×8
Bank 0: 80H~FFH
Bank 1: 80H~FFH
Bank 2: 80H~FFH
Bank 3: 80H~FFH
Bank 4: 80H~FFH
Bank 5: 80H~FFH
BS82D20A-3
Data Memory Sturcture
00H
Special Function
Data �emor�
40H in Bank 1
EEC
7FH
80H
General Purpose
Data �emor�
FFH
Bank 0
Bank 1
Bank N
N=� for BS8�B1�A-3; N=3 for BS8�C1�A-3; N=� for BS8�D�0A-3
Data Memory Structure
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Touch 8-Bit Flash MCU with LED/LCD Driver

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Touch 8-Bit Flash MCU with LED/LCD Driver

Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver

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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 directly will return a result of "00H" and writing to the
registers directly 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 the 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´
org 00h
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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Touch 8-Bit Flash MCU with LED/LCD Driver
Bank Pointer – BP
Depending upon which device is used, the Data Memory is divided into several banks. Selecting the
required Data Memory area is achieved using the Bank Pointer.
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 with the exception of the EEC
register in Bank 1, which means that the Special Function Registers can be accessed from within any
bank. The EEC register in bank 1 can only be accessed by indirectly addressing the Data Memory.
Directly addressing the Data Memory will always result in Bank 0 being accessed irrespective of the
value of the Bank Pointer. Accessing data from banks other than Bank 0 must be implemented using
Indirect Addressing.
Device
7
6
5
4
3
2
1
0
BS82B12A-3
—
—
—
—
—
—
DMBP1
DMBP0
BS82C16A-3
—
—
—
—
—
—
DMBP1
DMBP0
BS82D20A-3
—
—
—
—
—
DMBP2
DMBP1
DMBP0
BP Register List
BP Register – BS82B12A-3
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
DMBP1
DMBP0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
Bit 7 ~ 2
Unimplemented, read as "0"
Bit 1 ~ 0DMBP1~DMBP0: Select Data Memory Banks
00: Bank 0
01: Bank 1
10: Bank 2
11: Undefined
BP Register – BS82C16A-3
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
DMBP1
DMBP0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
Bit 7 ~ 2
Unimplemented, read as "0"
Bit 1 ~ 0DMBP1~DMBP0: Select Data Memory Banks
00: Bank 0
01: Bank 1
10: Bank 2
11: Bank 3
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BP Register – BS82D20A-3
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
DMBP2
DMBP1
DMBP0
R/W
—
—
—
—
—
R/W
R/W
R/W
POR
—
—
—
—
—
0
0
0
Bit 7 ~ 3
Unimplemented, read as "0"
Bit 2 ~ 0DMBP2~DMBP0: Select Data Memory Banks
000: Bank 0
001: Bank 1
010: Bank 2
011: Bank 3
100: Bank 4
101: Bank 5
11x: Undefined
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, TBHP, TBLH
These three special function registers are used to control operation of the look-up table which is
stored in the Program Memory. TBLP and TBHP are the table pointers and indicate the location
where the table data is located. Their value must be setup before any table read commands are
executed. Their 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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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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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
x
x
x
x
"x" 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.
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EEPROM Data Memory
The 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 64×8 bits. 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 an address and data register in Sector 0 and a single
control register in Sector 1.
Device
Capacity
Address
64×8
00H~3FH
BS82B12A-3
BS82C16A-3
BS82D20A-3
EEPROM Registers
Three registers control the overall operation of the internal EEPROM Data Memory. These are the
address register, 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 Bank 1, 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, 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
—
—
D5
D4
D3
D2
D1
D0
EED
D7
D6
D5
D4
D3
D2
D1
D0
EEC
—
—
—
—
WREN
WR
RDEN
RD
EEA Register
Rev. 1.40
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
Unimplemented, read as "0"
Bit 5 ~ 0
Data EEPROM address
Data EEPROM address bit 5 ~ bit 0
42
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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
Data EEPROM data
Data EEPROM data bit 7 ~ bit 0
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.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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.
Writing Data to the EEPROM
To write 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. Then 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 initial 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 device is
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 and EEPROM write
interrupts is enabled and the stack is not full, a jump to the associated Interrupt vector will take
place. When the interrupt is serviced, the EEPROM interrupt flag will be automatically reset.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Programming Considerations
Care must be taken that data is not inadvertently written to the EEPROM. Protection can be
enhanced by ensuring that the Write Enable bit is normally cleared to zero when not writing. Also
the Memory Pointer high byte register could be normally cleared to zero as this would inhibit
access to Sector 1 where 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 completed. Otherwise, the EEPROM read or write
operation will fail.
Programming Examples
• Reading data from the EEPROM - polling method
MOV A, EEPROM_ADRES ; user defined address
MOV EEA, A
MOV A, 040H
; setup memory pointer MP1
MOV MP1, A
; MP1 points to EEC register
MOV A, 01H
; setup Bank Pointer BP
MOV BP, A
SET IAR1.1
; set RDEN bit, enable read operations
SET IAR1.0
; start Read Cycle - set RD bit
BACK:
SZ IAR1.0
; check for read cycle end
JMP BACK
CLR IAR1
; disable EEPROM read/write
CLR BP
MOV A, EED
; move read data to register
MOV READ_DATA, A
• 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. 1.40
; user defined address
; user defined data
; setup memory pointer MP1
; MP1 points to EEC register
; setup Bank Pointer BP
; 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 read/write
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Touch 8-Bit Flash MCU with LED/LCD Driver
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 a combination of configuration options and registers.
Oscillator Overview
All the devices include two internal oscillators and the some devices also include an external
oscillator. In addition to being the source of the main system clock the oscillators also provide clock
sources for the Watchdog Timer, Time Bases and TMs. External oscillator requiring some external
components as well as fully integrated internal oscillators requiring no external components, are
provided to form a wide range of both fast and slow system oscillators. For the BS82C16A-3 and
BS82D20A-3 devices, the low speed oscillators are selected through the configuration option. The
higher frequency oscillators provide higher performance but carry with it the disadvantage of higher
power requirements, while the opposite is of course true for the lower frequency oscillators. With
the capability of dynamically switching between fast and slow system clock, the devices have the
flexibility to optimize the performance/power ratio, a feature especially important in power sensitive
portable applications.
Device
BS82B12A-3
BS82C16A-3
BS82D20A-3
BS82C16A-3
BS82D20A-3
Name
Freq.
Pins
Internal High Speed RC
Type
HIRC
8/12/16MHz
—
Internal Low Speed RC
LIRC
32kHz
—
External Low Speed Crystal
LXT
32768Hz
XT1/XT2
Oscillator Types
System Clock Configurations
There are three methods of generating the system clock, a high speed oscillator and two low speed
oscillators. The high speed oscillator is the internal 8MHz, 12MHz, 16MHz RC oscillator. The two
low speed oscillators are the internal 32kHz oscillator, LIRC, and the external 32.768kHz crystal
oscillator, LXT. 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.
For two of the three devices, the actual source clock used for the low speed oscillator is chosen via
configuration option. The frequency of the slow speed or high speed system clock is also determined
using the HLCLK bit and CKS2 ~ CKS0 bits in the SMOD register. Note that two oscillator
selections must be made namely one high speed and one low speed system oscillators. It is not
possible to choose a no-oscillator selection for either the high or low speed oscillator.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver

Note: The LXT oscillator is only for the BS82C16A-3 and BS82D20A-3.
System Clock Configurations
Internal RC Oscillator – HIRC
The internal RC oscillator is a fully integrated system oscillator requiring no external components.
The internal RC oscillator has a power on default frequency of 8 MHz but can be selected to be
either 8MHz, 12MHz or 16MHz via a configuration option and the HIRCS1 and HIRCS0 bits in
the CTRL register. 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.
Internal 32kHz Oscillator – LIRC
The Internal 32kHz System Oscillator is a 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.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
External 32.768kHz Crystal Oscillator – LXT
For the BS82C16A-3 and BS82D20A-3 devices, the External 32.768kHz Crystal System Oscillator
is one of the low frequency oscillator choices, which is selected via configuration option. This
clock source has a fixed frequency of 32.768kHz and requires a 32.768kHz crystal to be connected
between pins XT1 and XT2. The external resistor and capacitor components connected to the
32.768kHz crystal are necessary to provide oscillation. For applications where precise frequencies
are essential, these components may be required to provide frequency compensation due to different
crystal manufacturing tolerances. During power-up there is a time delay associated with the LXT
oscillator waiting for it to start-up.
When the microcontroller enters the SLEEP or IDLE Mode, the system clock is switched off to stop
microcontroller activity and to conserve power. However, in many microcontroller applications
it may be necessary to keep the internal timers operational even when the microcontroller is in
the SLEEP or IDLE Mode. To do this, another clock, independent of the system clock, must be
provided.
However, for some crystals, to ensure oscillation and accurate frequency generation, it is necessary
to add two small value external capacitors, C1 and C2. The exact values of C1 and C2 should be
selected in consultation with the crystal or resonator manufacturer specification. The external parallel
feedback resistor, Rp, is required. Note that the wire connected between the 32.768kHz crystal and
the XT1/XT2 pins should be kept as short as possible to minimize the stray noise interface.
The configuration option determines if the XT1/XT2 pins are used for the LXT oscillator or as I/O
pins or other pin-shared functions.
• If the LXT oscillator is not used for any clock source, the XT1/XT2 pins can be used as normal I/
O pins or other pin-shared functions.
• If the LXT oscillator is used for any clock source, the 32.768kHz crystal should be connected to
the XT1/XT2 pins.
For oscillator stability and to minimize the effects of noise and crosstalk, it is important to ensure
that the crystal and any associated resistors and capacitors along with interconnecting lines are all
located as close to the MCU as possible.

External LXT Oscillator
LXT Oscillator C1 and C2 Values
Crystal Frequency
C1
C2
32.768kHz
10pF
10pF
Note: 1. C1 and C2 values are for guidance only.
2. RP=5MΩ~10MΩ is recommended.
32.768kHz Crystal Recommended Capacitor Values
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
LXT Oscillator Low Power Function
The LXT oscillator can function in one of two modes, the Quick Start Mode and the Low Power
Mode. The mode selection is executed using the LXTLP bit in the CTRL register.
LXTLP Bit
LXT Mode
0
Quick Start
1
Low-power
After power on, the LXTLP bit will be automatically cleared to zero ensuring that the LXT oscillator
is in the Quick Start operating mode. In the Quick Start Mode the LXT oscillator will power up
and stabilise quickly. However, after the LXT oscillator has fully powered up it can be placed
into the Low-power mode by setting the LXTLP bit high. The oscillator will continue to run but
with reduced current consumption, as the higher current consumption is only required during the
LXT oscillator start-up. In power sensitive applications, such as battery applications, where power
consumption must be kept to a minimum, it is therefore recommended that the application program
sets the LXTLP bit high about 2 seconds after power-on.
It should be noted that, no matter what condition the LXTLP bit is set to, the LXT oscillator will
always function normally, the only difference is that it will take more time to start up if in the Lowpower mode.
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
The main system clock, can come from either a high frequency, fH, or low frequency, fSUB, source,
and is selected using the HLCLK bit and CKS2~CKS0 bits in the SMOD register. The high speed
system clock is sourced from the HIRC oscillator. The low speed system clock source can be sourced
from internal clock fSUB. Depending on the devices, if fSUB is selected then it is sourced by the LIRC
oscillator or can be sourced by either the LXT or LIRC oscillators, selected via a configuration
option. The other choice, which is a divided version of the high speed system oscillator has a range
of fH/2~fH/64.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver

System Clock Configurations
Note: The LXT oscillator is only for the BS82C16A-3 and BS82D20A-3. When the system clock source fSYS
is switched to fSUB from fH, the high speed oscillation will stop to conserve the power. Thus there is no
fH~fH/64 for peripheral circuit to use.
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System Operation Modes
There are five 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 three modes, the SLEEP,
IDLE0 and IDLE1 Mode are used when the microcontroller CPU is switched off to conserve power.
Description
Operating
Mode
CPU
fSYS
fSUB
NORMAL mode
On
fH~fH/64
On
SLOW mode
On
fSUB
On
ILDE0 mode
Off
Off
On
IDLE1 mode
Off
On
On
SLEEP mode
Off
Off
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 by 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.
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 fSUB. Running the microcontroller in this mode
allows it to run with much lower operating currents. In the SLOW Mode, the fH is off.
SLEEP 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 SLEEP mode the CPU will be stopped, and the fSUB clock will be
stopped too, the Watchdog Timer function is automatically disabled by hardware for power saving.
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 CTRL register is low. In the IDLE0 Mode the
system oscillator will be stop and will therefore be inhibited from driving the CPU.
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 CTRL 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. In the IDLE1 Mode, the system oscillator will
continue to run, and this system oscillator may be the high speed or low speed system oscillator.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Control Register
The SMOD register is used to control the internal clocks within the devices.
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
CKS2 ~ CKS0: The system clock selection when HLCLK is "0"
000: fSUB (LIRC or LXT)
001: fSUB (LIRC or LXT)
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 either the LXT or LIRC, a divided
version of the high speed system oscillator can also be chosen as the system clock source.
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 SLEEP mode but after a wake-up has occurred, the flag will
change to a high level after 1024 clock cycles if LXT oscillator is used and 1~2 clock
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 after a wake-up has occurred. This flag is cleared to
zero 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. The flag will be low when in the
SLEEP or IDLE0 Mode but after power on reset or a wake-up has occurred, the flag
will change to a high level after 15~16 clock cycles if the HIRC oscillator is used.
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 fSUB
1: fH
This bit is used to select if the fH clock or the fH/2 ~ fH/64 or fSUB 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 fSUB clock will be selected. When system clock switches from the fH clock to
the fSUB clock and the fH clock will be automatically switched off to conserve power.
Bit 7 ~ 5
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
HIRCS1
HIRCS0
LXTLP
LVRF
D1
WRF
R/W
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
—
0
0
0
x
0
0
"x" unknown
Bit 7
FSYSON: fSYS Control in IDLE Mode
0: Disable
1: Enable
Bit 6
Unimplemented, read as "0".
Bit 5 ~ 4
HIRCS1~HIRCS0: HIRC frequency clock select
00: 8MHz
01: 12 MHz
10: 16 MHz
11: 8 MHz
It is recommended that the HIRC frequency selected by these two bits is the same with
the frequency determined by the configuration option to keep the HIRC frequency
accuracy specified in the A.C. characteristics.
Bit 3LXTLP: LXT low power control
0: Quick Start mode
1: Low Power mode
Bit 2
LVRF: LVR function reset flag
Describe elsewhere
Bit 1
Undefined bit
This bit can be read or written by user software program
Bit 0WRF: WDT Control register software reset flag
Describe elsewhere
Rev. 1.40

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BS82B12A-3/BS82C16A-3/BS82D20A-3
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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 devices enter the IDLE Mode or the SLEEP Mode is
determined by the condition of the IDLEN bit in the SMOD register and FSYSON in the CTRL
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 fSUB. If the clock is from the fSUB, 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. The accompanying flowchart
shows what happens when the devices move between the various operating modes.
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 clearing the
HLCLK bit to zero 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 LXT or LIRC oscillator and therefore requires these
oscillators to be stable before full mode switching occurs. This is monitored using the LTO bit in the
SMOD register.
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
SLOW Mode to NORMAL Mode Switching
In SLOW Mode the system uses either the LXT or 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 high or HLCLK bit is low, 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. The amount of time required for high speed system oscillator
stabilization is 15~16 clock cycles.
Entering the SLEEP Mode
There is only one way for the devices to enter the SLEEP Mode and that is to execute the "HALT"
instruction in the application program with the IDLEN bit in SMOD register equal to "0". When this
instruction is executed under the conditions described above, the following will occur:
• The system clock and the fSUB 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 stop counting.
• 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. 1.40
55
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Entering the IDLE0 Mode
There is only one way for the devices 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 CTRL 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 low frequency fSUB clock will be on.
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and resume counting.
• 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 CTRL register equal to "1". When this instruction is executed under the conditions
described above, the following will occur:
• The system clock and the low frequency fSUB 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.
• 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.
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.
Rev. 1.40
56
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 falling edge on Port A
• A system interrupt
• A WDT overflow
If the device is woken up by a WDT overflow, a Watchdog Timer reset will be initiated. 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.
System Oscillator
Wake-up Time
(SLEEP Mode)
Wake-up Time
(IDLE0 Mode)
Wake-up Time
(IDLE1 Mode)
HIRC
15~16 HIRC cycles
1~2 HIRC cycles
LIRC
1~2 LIRC cycles
1~2 LIRC cycles
LXT
1024 LXT cycles
1~2 LXT cycles
Wake-Up Time
Programming Considerations
The high speed and low speed oscillators both use the same SST counter. For example, if the system
is woken up from the SLEEP Mode the HIRC oscillator needs to start-up from an off state.
If the device is woken up from the SLEEP Mode to the NORMAL Mode, the high speed system
oscillator needs an SST period. The device will execute the first instruction after HTO is high. At
this time, the LXT oscillator may not be stability if fSUB is from LXT oscillator. The same situation
occurs in the power-on state. The LXT oscillator is not ready yet when the first instruction is
executed.
Rev. 1.40
57
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 fSUB clock, depending on the devices,
the fSUB clock is in turn supplied by the LIRC oscillator or either the LXT or LIRC oscillator selected
by a configuration option. The LIRC internal oscillator has an approximate frequency of 32kHz and
this specified internal clock period can vary with VDD, temperature and process variations. The LXT
oscillator is supplied by an external 32.768 kHz crystal. The Watchdog Timer source clock is then
subdivided by a ratio of 28 to 218 to give longer timeouts, the actual value being chosen using the
WS2~WS0 bits in the WDTC register.
Watchdog Timer Control Register
A single register, WDTC, controls the required timeout period as well as the enable operation. The
WDTC register is initiated to 01010011B at any reset except WDT time-out hardware warm reset.
WDTC Register
Rev. 1.40
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
01010B or 10101B: Enabled
Other values: Reset MCU (Reset will be active after 2~3 LIRC clock for debounce time.)
If the MCU reset is caused by the WE [4:0] in WDTC software reset, the WRF flag of
CTRL register will be set.
Bit 2~ 0
WS2 ~ WS0: WDT Time-out period selection
000: 28/fSUB
001: 210/fSUB
010: 212/fSUB
011: 214/fSUB
100: 215/fSUB
101: 216/fSUB
110: 217/fSUB
111: 218/fSUB
These three bits determine the division ratio of the Watchdog Timer source clock,
which in turn determines the timeout period.
58
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
HIRCS1
HIRCS0
LXTLP
LVRF
D1
WRF
R/W
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
—
0
0
0
x
0
0
"x" unknown
Bit 7
FSYSON: fSYS Control in IDLE Mode
Describe elsewhere
Bit 6
Unimplemented, read as "0"
Bit 5~ 4
HIRCS1~HIRCS0: HIRC frequency clock select
Describe elsewhere
Bit 3LXTLP: LXT low power control
Describe elsewhere
Bit 2LVRF: LVR function reset flag
Describe elsewhere
Bit 1
Undefined bit
This bit can be read or written by user software program
Bit 0WRF: WDT Control register software reset flag
0: Not occur
1: Occurred
This bit is set high by the WDT Control register software reset and cleared by the
application program. Note that this bit can only be cleared to zero 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 instruction will not be executed in
the correct manner, in which case the Watchdog Timer will overflow and reset the device. There are
five bits, WE4~WE0, in the WDTC register to enable the WDT function. When the WE4~WE0 bits
value is equal to 01010B or 10101B, the WDT function is enabled. However, if the WE4~WE0 bits
are changed to any other values except 01010B and 10101B, which is caused by the environmental
noise, it will reset the microcontroller after 2~3 LIRC clock cycles. After power on these bits will
have a value of 01010B.
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. Three methods can be adopted to clear the contents of the Watchdog Timer.
The first is a WDT software reset, which means a certain value is written into the WE4~WE0 bit
filed except 01010B and 10101B, the second is using the Watchdog Timer software clear instruction
and the third 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.
The maximum time-out period is when the 218 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 8
seconds for the 218 division ratio, and a minimum timeout of 7.8ms for the 28 division ration.
Rev. 1.40
59
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Reset
�CU
WDTC Register WE4~WE0 bits
CLR
“HALT”Instruction
“CLR WDT”Instruction
LIRC
LXT
�
U
X
fSUB
11 stage divider
8-to-1 �UX
Configuration
Option
7-stage Divider
WS�~WS0
(fSUB/�1~fSUB/�11)
WDT Time-out
WS[�:0]=
000:�8/fSUB
001:�10/fSUB
010:�1�/fSUB
011:�14/fSUB
100:�1�/fSUB
101:�1�/fSUB
110:�17/fSUB
111:�18/fSUB
Note: For the BS82B12A-3 device, the fSUB is supplied only by the LIRC oscillator.
Watchdog Timer
Reset and Initialisation
A reset function is a fundamental part of any microcontroller ensuring that the device 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.
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.
Reset Functions
There are several ways in which a microcontroller reset can occur, through events occurring internally:
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.
VDD
Power-on
Reset
tRSTD
SST Time-out
Note: tRSTD is power-on delay, typical time=50ms
Power-On Reset Timing Chart
Rev. 1.40
60
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Low Voltage Reset – LVR
The microcontroller contains a low voltage reset circuit in order to monitor the supply voltage of the
device. The LVR function is always enabled 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 CTRL register will
also be set high. 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 fixed at a voltage value of 2.55V. Note that the LVR function will be
automatically disabled when the device enters the SLEEP or IDLE mode.
Note: tRSTD is power-on delay, typical time=50ms
Low Voltage Reset Timing Chart
• CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
HIRCS1
HIRCS0
LXTLP
LVRF
D1
WRF
R/W
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
—
0
0
0
x
0
0
"x" unknown
Bit 7 FSYSON: fSYS Control in IDLE Mode
Describe elsewhere
Bit 6
Unimplemented, read as "0".
Bit 5 ~ 4
HIRCS1~HIRCS0: HIRC frequency clock select
Describe elsewhere
Bit 3LXTLP: LXT low power control
Describe elsewhere
Bit 2
LVRF: LVR function reset flag
0: Not occur
1: Occurred
This bit is set high when a specific Low Voltage Reset situation condition occurs. This
bit can only be cleared to zero by the application program.
Bit 1
Undefined bit
This bit can be read or written by user software program
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 a 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
Rev. 1.40
61
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 zero and the TO flag will be set high. Refer to the A.C. Characteristics for
tSST details.
Note: The tSST is 15~16 clock cycles if the system clock source is provided by the HIRC.
The tSST is 1~2 clock for the LIRC. The tSST is 1024 clock for the LXT.
WDT Time-out Reset during SLEEP or IDLE Timing Chart
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
RESET Conditions
0
0
Power-on reset
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
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
Stack Pointer
Stack Pointer will point to the top of the stack
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.
Rev. 1.40
62
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
BS82B12A-3
BS82C16A-3
BS82D20A-3
Power On Reset
Program
Counter
●
●
●
0000H
0000H
0000H
0000H
MP0
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
MP1
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
●
●
---- --00
---- --00
---- --00
---- --uu
●
---- -000
---- -000
---- -000
---- -uuu
ACC
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
PCL
●
●
●
0000 0000
0000 0000
0000 0000
0000 0000
TBLP
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
TBLH
●
●
●
xxxx xxxx
uuuu uuuu
uuuu uuuu
uuuu uuuu
---- -xxx
---- -uuu
---- -uuu
---- -uuu
---- xxxx
---- uuuu
---- uuuu
---- uuuu
Register
BP
●
TBHP
●
LVR Reset
WDT Time-out
(Normal Operation) (Normal Operation)
WDT Time-out
(HALT)*
●
---x xxxx
---u uuuu
---u uuuu
---u uuuu
STATUS
●
●
●
--00 xxxx
--uu uuuu
--1u uuuu
- - 11 u u u u
SMOD
●
●
●
0 0 0 - 0 0 11
0 0 0 - 0 0 11
0 0 0 - 0 0 11
uuu- uuuu
INTEG
●
●
●
---- --00
---- --00
---- --00
---- --uu
INTC0
●
●
●
-000 0000
-000 0000
-000 0000
-uuu uuuu
INTC1
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
INTC2
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
INTC3
●
●
●
---- ---0
---- ---0
---- ---0
---- ---u
LVDC
●
●
●
--00 -000
--00 -000
--00 -000
--uu -uuu
PA
●
●
●
1 - - 1 1111
1 - - 1 1111
1 - - 1 1111
u--u uuuu
PAC
●
●
●
1 - - 1 1111
1 - - 1 1111
1 - - 1 1111
u--u uuuu
PAPU
●
●
●
0--0 0000
0--0 0000
0--0 0000
u--u uuuu
PAWU
●
●
●
0--0 0000
0--0 0000
0--0 0000
u--u uuuu
SLEDC0
●
●
●
0101 0101
0101 0101
0101 0101
uuuu uuuu
---- 0101
---- 0101
---- 0101
---- uuuu
SLEDC1
●
●
●
--01 0101
--01 0101
--01 0101
--uu uuuu
WDTC
●
●
●
0 1 0 1 0 0 11
0 1 0 1 0 0 11
0 1 0 1 0 0 11
uuuu uuuu
TBC
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PSCR
●
●
●
--00 --00
--00 --00
--00 --00
--uu --uu
EEA
●
●
●
--00 0000
--00 0000
--00 0000
--uu uuuu
EED
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PB
●
●
●
1111 1111
1111 1111
1111 1111
uuuu uuuu
PBC
●
●
●
1111 1111
1111 1111
1111 1111
uuuu uuuu
PBPU
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
I2CTOC
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
IICC0
●
●
●
---- 000-
---- 000-
---- 000-
---- uuu-
IICC1
●
●
●
1000 0001
1000 0001
1000 0001
uuuu uuuu
IICD
●
●
●
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
IICA
●
●
●
0000 000-
0000 000-
0000 000-
uuuu uuu-
USR
●
●
●
0 0 0 0 1 0 11
0 0 0 0 1 0 11
0 0 0 0 1 0 11
uuuu uuuu
UCR1
●
●
●
0000 00x0
0000 00x0
0000 00x0
uuuu uuuu
UCR2
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
BRG
●
●
●
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
Rev. 1.40
63
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
BS82B12A-3
BS82C16A-3
BS82D20A-3
Power On Reset
TXR_RXR
●
●
●
xxxx xxxx
xxxx xxxx
xxxx xxxx
uuuu uuuu
TMPC
●
●
●
---- 0000
---- 0000
---- 0000
---- uuuu
SLCDC0
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
SLCDC1
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
SLCDC2
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
●
●
---- 0000
---- 0000
---- 0000
---- uuuu
Register
SLCDC3
LVR Reset
WDT Time-out
(Normal Operation) (Normal Operation)
WDT Time-out
(HALT)*
PC
●
●
●
1111 1111
1111 1111
1111 1111
uuuu uuuu
PCC
●
●
●
1111 1111
1111 1111
1111 1111
uuuu uuuu
PCPU
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
CTRL
●
●
●
0-00 0x00
0-00 0x00
0-00 0x00
u-uu uuuu
PD
●
●
- - - - 1111
- - - - 1111
- - - - 1111
---- uuuu
PDC
●
●
- - - - 1111
- - - - 1111
- - - - 1111
---- uuuu
PDPU
●
●
---- 0000
---- 0000
---- 0000
---- uuuu
TKTMR
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKC0
●
●
●
-000 0000
-000 0000
-000 0000
-uuu uuuu
TK16DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TK16DH
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKC1
●
●
●
---- --11
---- --11
---- --11
---- --uu
TKM016DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM016DH
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM0ROL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM0ROH
●
●
●
---- --00
---- --00
---- --00
---- --uu
TKM0C0
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM0C1
●
●
●
0-00 0000
0-00 0000
0-00 0000
u-uu uuuu
TKM116DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM116DH
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM1ROL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM1ROH
●
●
●
---- --00
---- --00
---- --00
---- --uu
TKM1C0
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM1C1
●
●
●
0-00 0000
0-00 0000
0-00 0000
u-uu uuuu
TKM216DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM216DH
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM2ROL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM2ROH
●
●
●
---- --00
---- --00
---- --00
---- --uu
TKM2C0
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM2C1
●
●
●
0-00 0000
0-00 0000
0-00 0000
u-uu uuuu
TKM316DL
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM316DH
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM3ROL
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM3ROH
●
●
---- --00
---- --00
---- --00
---- --uu
TKM3C0
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM3C1
●
●
0-00 0000
0-00 0000
0-00 0000
u-uu uuuu
CTM0C0
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
CTM0C1
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
BS82B12A-3
BS82C16A-3
BS82D20A-3
Power On Reset
CTM0DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
CTM0DH
●
●
●
---- --00
---- --00
---- --00
---- --uu
CTM0AL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
CTM0AH
●
●
●
---- --00
---- --00
---- --00
---- --uu
PTM0C0
●
●
●
0000 0---
0000 0---
0000 0---
uuuu u---
PTM0C1
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0DL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0DH
●
●
●
---- --00
---- --00
---- --00
---- --uu
PTM0AL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0AH
●
●
●
---- --00
---- --00
---- --00
---- --uu
PTM0RPL
●
●
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
PTM0RPH
●
●
●
---- --00
---- --00
---- --00
---- --uu
TKM416DL
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM416DH
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM4ROL
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM4ROH
●
---- --00
---- --00
---- --00
---- --uu
TKM4C0
●
0000 0000
0000 0000
0000 0000
uuuu uuuu
TKM4C1
●
0-00 0000
0-00 0000
0-00 0000
u-uu uuuu
●
---- 0000
---- 0000
---- 0000
---- uuuu
Register
EEC
●
●
LVR Reset
WDT Time-out
(Normal Operation) (Normal Operation)
WDT Time-out
(HALT)*
Note: "*" stands for "warm reset"
"-" not implement
"u" stands for "unchanged"
"x" stands for "unknown"
Rev. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 ~ PD. 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 Register List
Device
BS82B12A-3
BS82C16A-3
BS82D20A-3
7
6
5
PAWU
PAWU7
—
—
PAWU4 PAWU3 PAWU2 PAWU1 PAWU0
PAPU
PAPU7
—
—
PAPU4 PAPU3 PAPU2 PAPU1 PAPU0
PA
PA7
—
—
PA4
PA3
PA2
PA1
PA0
PAC
PAC7
—
—
PAC4
PAC3
PAC2
PAC1
PAC0
PBPU
PB
PBC
PCPU
BS82C16A-3
BS82D20A-3
Bit
Register
Name
4
3
2
1
0
PBPU7 PBPU6 PBPU5 PBPU4 PBPU3 PBPU2 PBPU1 PBPU0
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
PBC7
PBC6
PBC5
PBC4
PBC3
PBC2
PBC1
PBC0
PCPU7 PCPU6 PCPU5 PCPU4 PCPU3 PCPU2 PCPU1 PCPU0
PC
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
PCC
PCC7
PCC6
PCC5
PCC4
PCC3
PCC2
PCC1
PCC0
PDPU
—
—
—
—
PD
—
—
—
—
PD3
PD2
PD1
PD0
PDC
—
—
—
—
PDC3
PDC2
PDC1
PDC0
PDPU3 PDPU2 PDPU1 PDPU0
PAWUn: PA wake-up function control
0: Disable
1: Enable
PAn/PBn/PCn/PDn: I/O Data bit
0: Data 0
1: Data 1
PACn/PBCn/PCCn/PDCn: I/O Type selection
0: Output
1: Input
PAPUn/PBPUn/PCPUn/PDPUn: I/O Pull-high function control
0: Disable
1: Enable
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
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 registers PAPU~PDPU, and are implemented using weak
PMOS transistors.
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.
I/O Port Control Registers
Each I/O port has its own control register known as PAC~PDC, to control the input/output
configuration. With this control register, 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.
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
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
Source Current Selection
The source current of each pin in these devices can be configured with different source current
which is selected by the corresponding pin source current select bits. These source current bits are
available when the corresponding pin is configured as a CMOS output. Otherwise, these select bits
have no effect. Users should refer to the D.C. Characteristics section to obtain the exact value for
different applications.
SLEDC0 Register
Bit
7
6
5
4
3
2
1
0
Name
PBPS3
PBPS2
PBPS1
PBPS0
PAPS3
PAPS2
PAPS1
PAPS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
1
0
1
0
1
0
1
Bit 7 ~ 6
PBPS3~PBPS2: PB7~PB4 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
Bit 5 ~ 4
PBPS1~PBPS0: PB3~PB0 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
Bit 3 ~ 2
PAPS3~PAPS2: PA7 and PA4 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
Bit 1 ~ 0
PAPS1~PAPS0: PA3~PA0 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
SLEDC1 Register – BS82B12A-3
Rev. 1.40
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
PCPS3
PCPS2
PCPS1
PCPS0
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
1
0
1
Bit 7 ~ 4
Unimplemented, read as "0"
Bit 3 ~ 2
PCPS3~PCPS2: PC7~PC4 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
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Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 1 ~ 0
PCPS1~PCPS0: PC3~PC0 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
SLEDC1 Register – BS82C16A-3/BS82D20A-3
Bit
7
6
5
4
3
2
1
0
Name
—
—
PDPS1
PDPS0
PCPS3
PCPS2
PCPS1
PCPS0
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
0
1
0
1
0
1
Bit 7 ~ 6
Unimplemented, read as "0"
Bit 5 ~ 4
PDPS1~PDPS0: PD3~PD0 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
Bit 3 ~ 2
PCPS3~PCPS2: PC7~PC4 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
Bit 1 ~ 0
PCPS1~PCPS0: PC3~PC0 source current select
00 : source = Level 0 (min.)
01 : source = Level 1
10 : source = Level 2
11 : source = Level 3 (max.)
These bits are available when the corresponding pin is configured as a CMOS output.
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 pull-high
selections have been chosen. If the port control registers, PAC~PDC, 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, PA~PD, 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. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 device includes 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 Compact and Periodic TM sections.
Introduction
Each device contains a 10-bit Compact TM, CTM, and a 10-bit Periodic TM, PTM. Although
similar in nature, the different TM types vary in their feature complexity. The common features to
the Compact 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.
Function
CTM
PTM
Timer/Counter
√
√
I/P Capture
—
√
Compare Match Output
√
√
PWM Channels
1
1
Single Pulse Output
PWM Alignment
PWM Adjustment Period & Duty
—
1
Edge
Edge
Duty or Period
Duty or Period
TM Function Summary
CTM0
PTM0
10-bit CTM
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 xTMn
control registers, where "x" can stand for C or P and "n" is the serial number. The clock source can
be a ratio of either the system clock fSYS or the internal high clock fH, the fSUB clock source or the
external TCKn pin. The TCKn pin clock source is used to allow an external signal to drive the TM
as an external clock source or for event counting.
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
TM Interrupts
The Compact 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 one TM input pins, with the label TCKn. The TM
input pin, TCKn, 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. The TM input pin can be chosen to have either a rising or falling active edge. The
TCK1 pin is also used as the external trigger input pin in single pulse output mode for the PTM0.
The TMs each has two output pins. 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. As the TM output pins are pin-shared with other function, the TM output
function must first be setup using the associated register. A single bit in the register determines if its
associated pin is to be used as an external TM output pin or if it is to have another function.
Device
CTM0
PTM0
BS82B12A-3
BS82C16A-3
BS82D20A-3
TCK0
TP0_0, TP0_1
TCK1
TP1_0, TP1_1
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. Setting
the bit high will setup the corresponding pin as a TM input/output, if reset to zero the pin will retain
its original other function.
BS82B12A-3 CTM Function Pin Control Block Diagram
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
BS82C16A-3/BS82D20A-3 CTM Function Pin Control Block Diagram
P C 4 O u tp u t F u n c tio n
0
P C 4 /T P 1 _ 0
1
0
1
T M 1 P C 0
P C 4
P C 6 O u tp u t F u n c tio n
O u tp u t
0
1
0
P C 6 /T P 1 _ 1
1
T M 1 P C 1
P C 6
0
0
C a p tu re In p u t
1
1
T M 1 P C 1
P T 0 C K S
1
0
T M 1 P C 0
T C K In p u t
P A 0 /T C K 1
BS82B12A-3 PTM Function Pin Control Block Diagram
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
P D 0 O u tp u t F u n c tio n
0
P D 0 /T P 1 _ 0
1
0
1
T M 1 P C 0
P D 0
P C 6 O u tp u t F u n c tio n
O u tp u t
0
P C 6 /T P 1 _ 1
1
0
1
T M 1 P C 1
P C 6
1
0
0
C a p tu re In p u t
1
T M 1 P C 1
P 0 T C K S
1
0
T M 1 P C 0
T C K In p u t
P A 0 /T C K 1
BS82C16A-3/BS82D20A-3 PTM Function Pin Control Block Diagram
TMPC Register
Rev. 1.40
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
TM1PC1
TM1PC0
TM0PC1
TM0PC0
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
0
0
0
Bit 7~4 Unimplemented, read as "0"
Bit 3
TM1PC1: TP1_1 pin Control
0: Disabled
1: Enabled
Bit 2
TM1PC0: TP1_0 pin control
0: Disabled
1: Enabled
Bit 1
TM0PC1: TP0_1 pin Control
0: Disabled
1: Enabled
Bit 0
TM0PC0: TP0_0 pin Control
0: Disabled
1: Enabled
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Programming Considerations
The TM Counter Registers and the Capture/Compare CCRA and CCRP registers, being 10-bit, 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 and CCRP registers are implemented in the way shown in the following diagram and
accessing these registers is carried out in a specific way described above, it is recommended to use
the "MOV" instruction to access the CCRA and CCRP low byte registers, named xTMnAL and
PTMnRPL, in the following access procedures. Accessing the CCRA or CCRP low byte register
without following these access procedures will result in unpredictable values.
xT�n Counter Register (Read onl�)
xT�nDL
xT�nDH
8-bit
Buffer
xT�nAL
xT�nAH
xT�n CCRA Register
(Read/Write)
PT�nRPL PT�nRPH
PT�n CCRP Register (Read/Write)
Data Bus
The following steps show the read and write procedures:
• Writing Data to CCRA or CCRP
♦♦
Step 1. Write data to Low Byte xTMnAL or PTMnRPL
––note that here data is only written to the 8-bit buffer.
♦♦
Step 2. Write data to High Byte xTMnAH 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 CCRP
Rev. 1.40
♦♦
Step 1. Read data from the High Byte xTMnDH, xTMnAH 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 xTMnDL, xTMnAL or PTMnRPL
––this step reads data from the 8-bit buffer.
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Compact Type TM – CTM0
Although the simplest form of the two TM types, the Compact TM type still contains three operating
modes, which are Compare Match Output, Timer/Event Counter and PWM Output modes. The
Compact TM can also be controlled with an external input pin and can drive two external output
pins.

Compact Type TM Block Diagram
Compact 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 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 three bits wide whose value is compared with the highest three bits in the counter while the
CCRA is the ten 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 CT0ON 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 CTM0 interrupt signal will also usually be generated. The Compact
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 one output pin. All operating setup conditions
are selected using relevant internal registers.
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
Compact Type TM Register Description
Overall operation of each Compact TM is controlled using several 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 the three CCRP bits.
Bit
Register
Name
7
6
5
4
3
CTM0C0
CT0PAU
CT0CK2
CT0CK1
CT0CK0
CT0ON
CT0RP2 CT0RP1
CTM0C1
CT0M1
CT0M0
CT0IO1
CT0IO0
CT0OC
CT0POL CT0DPX CT0CCLR
CTM0DL
D7
D6
D5
D4
D3
2
1
0
CT0RP0
D2
D1
D0
CTM0DH
—
—
—
—
—
—
D9
D8
CTM0AL
D7
D6
D5
D4
D3
D2
D1
D0
CTM0AH
—
—
—
—
—
—
D9
D8
Compact TM Register List
CTM0C0 Register
Bit
7
6
5
4
3
2
1
0
Name
CT0PAU
CT0CK2
CT0CK1
CT0CK0
CT0ON
CT0RP2
CT0RP1
CT0RP0
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
CT0PAU: CTM0 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 CTM0 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 6~4CT0CK2~CT0CK0: Select CTM0 Counter clock
000: fSYS/4
001: fSYS
010: fH/16
011: fH/64
100: fSUB
101: fSUB
110: TCK0 rising edge clock
111: TCK0 falling edge clock
These three bits are used to select the clock source for the CTM0. 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 fSUB are other internal clocks, the details of which
can be found in the oscillator section.
Rev. 1.40
76
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 3
CT0ON: CTM0 Counter On/Off Control
0: Off
1: On
This bit controls the overall on/off function of the CTM0. Setting the bit high enables
the counter to run, clearing the bit disables the CTM0. Clearing this bit to zero will
stop the counter from counting and turn off the CTM0 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.
If the CTM0 is in the Compare Match Output Mode then the CTM0 output pin will
be reset to its initial condition, as specified by the CT0OC bit, when the CT0ON bit
changes from low to high.
Bit 2~0
CT0RP2~CT0RP0: CTM0 CCRP 3-bit register, compared with the CTM0 Counter
bit 9~bit 7 Comparator P Match Period
000: 1024 CTM0 clocks
001: 128 CTM0 clocks
010: 256 CTM0 clocks
011: 384 CTM0 clocks
100: 512 CTM0 clocks
101: 640 CTM0 clocks
110: 768 CTM0 clocks
111: 896 CTM0 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 CT0CCLR bit is set to
zero. Setting the CT0CCLR 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.
CTM0C1 Register
Bit
7
6
5
4
3
Name
CT0M1
CT0M0
CT0IO1
CT0IO0
CT0OC
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
Bit 5~4
Rev. 1.40
2
1
0
CT0POL CT0DPX CT0CCLR
CT0M1~CT0M0: Select CTM0 Operating Mode
00: Compare Match Output Mode
01: Undefined
10: PWM Mode
11: Timer/Counter Mode
These bits setup the required operating mode for the CTM0. To ensure reliable
operation the CTM0 should be switched off before any changes are made to the
CT0M1 and CT0M0 bits. In the Timer/Counter Mode, the CTM0 output pin control
must be disabled.
CT0IO1~CT0IO0: Select TP0 output function
Compare Match Output Mode
00: No change
01: Output low
10: Output high
11: Toggle output
PWM Mode
00: PWM Output inactive state
01: PWM Output active state
10: PWM output
11: Undefined
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Timer/counter Mode
Unused
These two bits are used to determine how the CTM0 output pin changes state when a
certain condition is reached. The function that these bits select depends upon in which
mode the CTM0 is running.
In the Compare Match Output Mode, the CT0IO1 and CT0IO0 bits determine how the
CTM0 output pin changes state when a compare match occurs from the Comparator A.
The CTM0 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 bits are both
zero, then no change will take place on the output. The initial value of the CTM0
output pin should be setup using the CT0OC bit in the CTM0C1 register. Note that
the output level requested by the CT0IO1 and CT0IO0 bits must be different from the
initial value setup using the CT0OC bit otherwise no change will occur on the CTM0
output pin when a compare match occurs. After the CTM0 output pin changes state
it can be reset to its initial level by changing the level of the CT0ON bit from low to
high. In the PWM Mode, the CT0IO1 and CT0IO0 bits determine how the CTM0
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 only change
the values of the CT0IO1 and CT0IO0 bits only after the CTM0 has been switched off.
Unpredictable PWM outputs will occur if the CT0IO1 and CT0IO0 bits are changed
when The CTM0 is running.
Rev. 1.40
Bit 3
CT0OC: TP0 Output control bit
Compare Match Output Mode
0: Initial low
1: Initial high
PWM Mode
0: Active low
1: Active high
This is the output control bit for the CTM0 output pin. Its operation depends upon
whether CTM0 is being used in the Compare Match Output Mode or in the PWM
Mode. It has no effect if the CTM0 is in the Timer/Counter Mode. In the Compare
Match Output Mode it determines the logic level of the CTM0 output pin before a
compare match occurs. In the PWM Mode it determines if the PWM signal is active
high or active low.
Bit 2
CT0POL: TP0 Output polarity Control
0: Non-invert
1: Invert
This bit controls the polarity of the CTM0 output pin. When the bit is set high the
CTM0 output pin will be inverted and not inverted when the bit is zero. It has no effect
if the CTM0 is in the Timer/Counter Mode.
Bit 1
CT0DPX: CTM0 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
CT0CCLR: Select CTM Counter clear condition
0: CTM0 Comparatror P match
1: CTM0 Comparatror A match
This bit is used to select the method which clears the counter. Remember that the
Compact CTM0 contains two comparators, Comparator A and Comparator P, either of
which can be selected to clear the internal counter. With the CT0CCLR 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 CT0CCLR bit is not
used in the PWM Mode.
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Touch 8-Bit Flash MCU with LED/LCD Driver
CTM0DL 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
Bit 7 ~ 0
CTM0 Counter Low Byte Register bit 7 ~ bit 0
CTM0 10-bit Counter bit 7 ~ bit 0
CTM0DH Register
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
CTM0 Counter High Byte Register bit 1 ~ bit 0
CTM0 10-bit Counter bit 9 ~ bit 8
CTM0AL 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
CTM0 CCRA Low Byte Register bit 7 ~ bit 0
CTM0 10-bit CCRA bit 7 ~ bit 0
CTM0AH Register
Rev. 1.40
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 ~ 0
CTM0 CCRA High Byte Register bit 1 ~ bit 0
CTM0 10-bit CCRA bit 9 ~ bit 8
79
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Compact Type TM Operating Modes
The Compact Type TM can operate in one of three operating modes, Compare Match Output Mode,
PWM Output Mode or Timer/Counter Mode. The operating mode is selected using the CT0M1 and
CT0M0 bits in the CTM0C1 register.
Compare Match Output Mode
To select this mode, bits CT0M1 and CT0M0 in the CTM0C1 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 CT0CCLR 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 CTMA0F and CTMP0F interrupt request flags
for Comparator A and Comparator P respectively, will both be generated.
If the CT0CCLR bit in the CTM0C1 register is high then the counter will be cleared when a compare
match occurs from Comparator A. However, here only the CTMA0F interrupt request flag will be
generated even if the value of the CCRP bits is less than that of the CCRA registers. Therefore when
CT0CCLR is high no CTMP0F interrupt request flag will be generated. If the CCRA bits are all
zero, the counter will overflow when its reaches its maximum 10-bit, 3FF Hex, value, however here
the CTMA0F interrupt request flag will not be generated.
As the name of the mode suggests, after a comparison is made, the CTM0 output pin will change
state. The CTM0 output pin condition however only changes state when a CTMA0F interrupt
request flag is generated after a compare match occurs from Comparator A. The CTMP0F interrupt
request flag, generated from a compare match occurs from Comparator P, will have no effect on
the CTM0 output pin. The way in which the CTM0 output pin changes state are determined by
the condition of the CT0IO1 and CT0IO0 bits in the CTM0C1 register. The CTM0 output pin can
be selected using the CT0IO1 and CT0IO0 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 CTM0
output pin, which is setup after the CT0ON bit changes from low to high, is setup using the CT0OC
bit. Note that if the CT0IO1 and CT0IO0 bits are zero then no pin change will take place.
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
0x3FF
CT0CCLR= 0; CT0�[1:0] = 00
Counter
overflow
Counter Value
CCRP > 0
Counter cleared b� CCRP value
CCRP = 0
Counter
Reset
Resume
CCRP > 0
CCRP
Pause
CCRA
Stop
Time
CT0ON
CT0PAU
CT0POL
CCRP Int.
Flag CT�P0F
CCRA Int.
Flag CT�A0F
CT�0 O/P Pin
Output Pin set
to Initial Level
Low if CT0OC= 0
Output Toggle
with CT�A0F flag
Now CT0IO[1:0] = 10
Active High Output Select
Output inverts
when CT0POL is high
Output Pin
Reset to initial value
Output not affected b�
CT�A0F flag. Remains High
until reset b� CT0ON bit
Output controlled
b� other pin-shared function
Here CT0IO[1:0] = 11
Toggle Output Select
Compare Match
Match Output
- CT0CCLR=0
Compare
OutputMode
Mode
- CT0CCLR= 0
Note: 1. With CT0CCLR = 0, a Comparator P match will clear the counter
2. The CTM0 output pin controlled only by the CTMA0F flag
3. The output pin reset to initial state by a CT0ON bit rising edge
Rev. 1.40
81
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
CT0CCLR = 1; CT0�[1:0] = 00
Counter Value
CCRA > 0
Counter cleared b� CCRA value
0x3FF
Resume
CCRA
CCRA = 0
Counter overflow
CCRA = 0
Pause
CCRP
Stop
Counter Reset
Time
CT0ON
CT0PAU
CT0POL
No CT�A0F flag
generated on
CCRA overflow
CCRA Int.
Flag CT�A0F
CCRP Int.
Flag CT�P0F
CT�0 O/P Pin
Output does
not change
CT�P0F not
generated
Output not affected b�
Output Pin set
to Initial Level
Low if CT0OC= 0
Output Toggle
with CT�A0F flag
Output inverts
when CT0POL is high
Output Pin
Reset to initial value
Output controlled
b� other pin- shared function
CT�A0F flag. Remains High
Now CT0IO[1:0] = 10
Active High Output Select
Here CT0IO[1:0] = 11
Toggle Output Select
until reset b� CT0ON bit
Compare Match Output Mode - CT0CCLR=1
Compare Match Output Mode - C0TCCLR = 1
Note: 1. With CT0CCLR = 1, a Comparator A match will clear the counter
2. The CTM0 output pin controlled only by the CTMA0F flag
3. The output pin reset to initial state by a CT0ON rising edge
4. The CTMP0F flags is not generated when CT0CCLR = 1
Rev. 1.40
82
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Timer/Counter Mode
To select this mode, bits CT0M1 and CT0M0 in the CTM0C1 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
CTM0 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 CTM0 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 CT0M1 and CT0M0 in the CTM0C1 register should be set to 10
respectively. The PWM function within the CTM0 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 CTM0 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 CT0CCLR bit has no effect on the PWM
operation. 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 CT0DPX bit in the CTM0C1 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 CT0OC bit In the CTM0C1 register is used
to select the required polarity of the PWM waveform while the two CT0IO1 and CT0IO0 bits are
used to enable the PWM output or to force the CTM0 output pin to a fixed high or low level. The
CT0POL bit is used to reverse the polarity of the PWM output waveform.
CTM, PWM Mode, Edge-aligned Mode, CT0DPX=0
CCRP
001b
010b
011b
100b
101b
110b
111b
000b
Period
128
256
384
512
640
768
896
1024
Duty
CCRA
If fSYS = 16MHz, CTM0 clock source is fSYS/4, CCRP = 100b, CCRA =128,
The CTM0 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%.
CTM, PWM Mode, Edge-aligned Mode, CT0DPX=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 CTM0 clock
while the PWM duty cycle is defined by the CCRP register value.
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter
Value
CT0DPX=0;CT0M[1:0]=10
CounterCleared byCCRP
Counterresetwhen
CT0ONreturnshigh
CCRP
Pause Resume
CCRA
CounterStopIf
CT0ONbitlow
Time
CT0ON
CT0PAU
CT0POL
CCRAInt.
FlagCTMA0F
CCRPInt.
FlagCTMP0F
CTM0O/PPin
(CT0OC=1)
CTM0O/PPin
(CT0OC=0)
PWMDutyCycle
setbyCCRA
Outputcontrolledby
Otherpin-sharedfunction
PWMresumes
operation
OutputInverts
WhenCT0POL=1
PWMPeriod
setbyCCRP
PWM
ModeMode
– CT0DPX
=0 =0
PWM
–CT0DPX
Note: 1. Here CT0DPX = 0 - Counter cleared by CCRP
2. A counter clear sets PWM Period
3. The internal PWM function continues running even when CT0IO[1:0] = 00 or 01
4. The CT0CCLR bit has no influence on PWM operation
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter
Value
CT0DPX=1;CT0M[1:0]=10
CounterCleared byCCRA
Counterresetwhen
CT0ONreturnshigh
CCRA
Pause Resume
CCRP
CounterStopIf
CT0ONbitlow
Time
CT0ON
CT0PAU
CT0POL
CCRPInt.
FlagCTMP0F
CCRAInt.
FlagCTMA0F
CTM0O/PPin
(CT0OC=1)
CTM0O/PPin
(CT0OC=0)
PWMDutyCycle
setbyCCRP
Outputcontrolledby
Otherpin-sharedfunction
PWMresumes
operation
OutputInverts
WhenCT0POL=1
PWMPeriod
setbyCCRA
PWM Mode – CT0DPX = 1
PWM Mode–CT0DPX = 1
Note: 1. Here CT0DPX = 1 - Counter cleared by CCRA
2. A counter clear sets PWM Period
3. The internal PWM function continues even when CT0IO[1:0] = 00 or 01
4. The CT0CCLR bit has no influence on PWM operation
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Periodic Type TM – PTM0
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
be controlled with one external input pin and can drive two external output pins.

Periodic Type TM Block Diagram
Periodic TM Operation
At the core is a 10 count-up counter which is driven by a user selectable internal or external 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 comparator is 10-bit wide.
The only way of changing the value of the 10-bit counter using the application program, is to
clear the counter by changing the PT0ON 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 PTM0 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 more than one output pin. All operating setup
conditions are selected using relevant internal registers.
Rev. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Periodic Type TM Register Description
Overall operation of the Periodic Type 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 value and CCRP value. The remaining two registers are control
registers which setup the different operating and control modes.
Bit
Register
Name
7
6
5
4
3
2
1
0
PTM0C0
PT0PAU
PT0CK2
PT0CK1
PT0CK0
PT0ON
—
—
—
PTM0C1
PT0M1
PT0M0
PT0IO1
PT0IO0
PT0OC
PT0POL
PT0CKS
PT0CCLR
PTM0DL
D7
D6
D5
D4
D3
D2
D1
D0
PTM0DH
—
—
—
—
—
—
D9
D8
PTM0AL
D7
D6
D5
D4
D3
D2
D1
D0
PTM0AH
—
—
—
—
—
—
D9
D8
PTM0RPL
D7
D6
D5
D4
D3
D2
D1
D0
PTM0RPH
—
—
—
—
—
—
D9
D8
10-bit Periodic TM Register List
PTM0C0 Register
Rev. 1.40
Bit
7
6
5
4
3
2
1
0
Name
PT0PAU
PT0CK2
PT0CK1
PT0CK0
PT0ON
—
—
—
R/W
R/W
R/W
R/W
R/W
R/W
—
—
—
POR
0
0
0
0
0
—
—
—
Bit 7
PT0PAU: PTM0 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 PTM1 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
PT0CK2 ~ PT0CK0: Select PTM0 Counter clock
000: fSYS/4
001: fSYS
010: fH/16
011: fH/64
100: fSUB
101: fSUB
110: TCK1 rising edge clock
111: TCK1 falling edge clock
These three bits are used to select the clock source for the PTM0. The external pin
clock source can be chosen to be active on the rasing or falling edge. The clock source
fSYS is the system clock, while fH and fSUB are other internal clocks, the details of which
can be found in the oscillator section.
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 3
PT0ON: PTM0 Counter On/Off Control
0: Off
1: On
This bit controls the overall on/off function of the PTM0. Setting the bit high enables
the counter to run, clearing the bit disables the PTM0. Clearing this bit to zero will
stop the counter from counting and turn off the PTM0 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 PTM0 is in the Compare Match Output Mode, PWM output Mode or Single
Pulse Output Mode then the PTM output pin will be reset to its initial condition, as
specified by the PT0OC bit, when the PT0ON bit changes from low to high.
Bit 2 ~ 0
Unimplemented, read as "0"
PTM0C1 Register
Rev. 1.40
Bit
7
6
5
4
3
2
1
0
Name
PT0M1
PT0M0
PT0IO1
PT0IO0
PT0OC
PT0POL
PT0CKS
PT0CCLR
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
PT0M1~PT0M0: Select PTM0 Operating 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 PTM0. To ensure reliable
operation the PTM0 should be switched off before any changes are made to the bits. In
the Timer/Counter Mode, the PTM0 output pin state is undefined.
Bit 5 ~ 4
PT0IO1~PT0IO0: Select TP1 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 TP1_0, TP1_1 or TCK1
01: Input capture at falling edge of TP1_0, TP1_1 or TCK1
10: Input capture at falling/rising edge of TP1_0, TP1_1 or TCK1
11: Input capture disabled
Timer/counter Mode:
Unused
These two bits are used to determine how the PTM0 output pin changes state when a
certain condition is reached. The function that these bits select depends upon in which
mode the PTM0 is running.
88
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
In the Compare Match Output Mode, the PT0IO1~PT0IO0 bits determine how the
PTM0 output pin changes state when a compare match occurs from the Comparator
A. The PTM0 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
PT0IO1~PT0IO0 bits are both zero, then no change will take place on the output.
The initial value of the PTM0 output pin should be setup using the PT0OC bit in the
PTM0C1 register. Note that the output level requested by the PT0IO1~PT0IO0 bits
must be different from the initial value setup using the PT0OC bit otherwise no change
will occur on the PTM1 output pin when a compare match occurs. After the PTM0
output pin changes state it can be reset to its initial level by changing the level of the
PT0ON bit from low to high.
In the PWM Mode, the PT0IO1 and PT0IO0 bits determine how the PTM0 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 PT0IO1 and PT0IO0 bits only after the PTM0 has been switched off.
Unpredictable PWM outputs will occur if the PT0IO1 and PT0IO0 bits are changed
when the PTM0 is running.
Rev. 1.40
Bit 3
PT0OC: TP1 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 PTM0 output pin. Its operation depends upon
whether PTM0 is being used in the Compare Match Output Mode or in the PWM
Mode/ Single Pulse Output Mode. It has no effect if the PTM0 is in the Timer/Counter
Mode. In the Compare Match Output Mode it determines the logic level of the PTM0
output pin before a compare match occurs. In the PWM Mode it determines if the
PWM signal is active high or active low.
Bit 2
PT0POL: TP1 Output polarity Control
0: Non-invert
1: Invert
This bit controls the polarity of the PTM0 output pin. When the bit is set high the
PTM0 output pin will be inverted and not inverted when the bit is zero. It has no effect
if the PTM0 is in the Timer/Counter Mode.
Bit 1
PT0CKS: PTM0 capture trigger source select
0: From TP1_0, TP1_1
1: From TCK1
Bit 0
PT0CCLR: Select PTM0 Counter clear condition
0: PTM0 Comparatror P match
1: PTM0 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 PT0CCLR 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 PT0CCLR bit is not
used in the PWM, Single Pulse or Input Capture Mode.
89
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
PTM0DL 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
Bit 7 ~ 0
PTM0 Counter Low Byte Register bit 7 ~ bit 0
PTM0 10-bit Counter bit 7 ~ bit 0
PTM0DH Register
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
PTM0 Counter High Byte Register bit 1 ~ bit 0
PTM0 10-bit Counter bit 9 ~ bit 8
PTM0AL 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
PTM0 CCRA Low Byte Register bit 7 ~ bit 0
PTM0 10-bit CCRA bit 7 ~ bit 0
PTM0AH 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 ~ 0
PTM0 CCRA High Byte Register bit 1 ~ bit 0
PTM0 10-bit CCRA bit 9 ~ bit 8
PTM0RPL 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. 1.40
PTM0 CCRP Low Byte Register bit 7 ~ bit 0
PTM0 10-bit CCRP bit 7 ~ bit 0
90
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
PTM0RPH 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 ~ 0
PTM0 CCRP High Byte Register bit 1 ~ bit 0
PTM0 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 PT0M1 and PT0M0 bits in the PTM0C1 register.
Compare Match Output Mode
To select this mode, bits PT0M1 and PT0M0 in the PTM0C1 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 PT0CCLR 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 PTMA0F and PTMP0F interrupt request flags
for Comparator A and Comparator P respectively, will both be generated.
If the PT0CCLR bit in the PTM0C1 register is high then the counter will be cleared when a compare
match occurs from Comparator A. However, here only the PTMA0F interrupt request flag will
be generated even if the value of the CCRP bits is less than that of the CCRA registers. Therefore
when PT0CCLR is high no PTMP0F interrupt request flag will be generated. In the Compare Match
Output Mode, the CCRA can not be cleared to zero.
If the CCRA bits are all zero, the counter will overflow when its reaches its maximum 10-bit, 3FF
Hex, value, however here the PTMA0F interrupt request flag will not be generated.
As the name of the mode suggests, after a comparison is made, the PTM0 output pin, will change
state. The PTM0 output pin condition however only changes state when a PTMA0F interrupt request
flag is generated after a compare match occurs from Comparator A. The PTMP0F interrupt request
flag, generated from a compare match occurs from Comparator P, will have no effect on the PTM0
output pin. The way in which the PTM0 output pin changes state are determined by the condition of
the PT0IO1 and PT0IO0 bits in the PTM0C1 register. The PTM0 output pin can be selected using
the PT0IO1 and PT0IO0 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 PTM0 output pin, which is
setup after the PT0ON bit changes from low to high, is setup using the PT0OC bit. Note that if the
PT0IO1 and PT0IO0 bits are zero then no pin change will take place.
Rev. 1.40
91
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter Value
Counter overflow
CCRP=0
0x3FF
PT0CCLR = 0; PT0� [1:0] = 00
CCRP > 0
Counter cleared b� CCRP value
CCRP > 0
Counter
Restart
Resume
CCRP
Pause
CCRA
Stop
Time
PT0ON
PT0PAU
PT0POL
CCRP Int. Flag
PT�P0F
CCRA Int. Flag
PT�A0F
PT�0 O/P
Pin
Output pin set to
initial Level Low
if PT0OC=0
Output not affected b�
PT�A0F flag. Remains High
until reset b� PT0ON bit
Output Toggle with
PT�A0F flag
Here PT0IO [1:0] = 11
Toggle Output select
Note PT0IO [1:0] = 10
Active High Output select
Output Inverts
when PT0POL is high
Output Pin
Reset to Initial value
un-defined
Compare Match Output Mode – PT0CCLR=0
Note: 1. With PT0CCLR=0 a Comparator P match will clear the counter
2. The PTM0 output pin is controlled only by the PTMA0F flag
3. The output pin is reset to itsinitial state by a PT0ON bit rising edge
Rev. 1.40
92
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter Value
PT0CCLR = 1; PT0� [1:0] = 00
CCRA = 0
Counter overflow
CCRA > 0 Counter cleared b� CCRA value
0x3FF
CCRA=0
Resume
CCRA
Pause
Stop
Counter Restart
CCRP
Time
PT0ON
PT0PAU
PT0POL
No PT�A0F flag
generated on
CCRA overflow
CCRA Int. Flag
PT�A0F
CCRP Int. Flag
PT�P0F
PT�0 O/P
Pin
PT�P0F not
generated
Output pin set to
initial Level Low
if PT0OC=0
Output does
not change
Output Toggle with
PT�A0F flag
Here PT0IO [1:0] = 11
Toggle Output select
Output not affected b�
PT�A0F flag. Remains High
until reset b� PT0ON bit
Note PT0IO [1:0] = 10
Active High Output select
Output Inverts
when PT0POL is high
Output Pin
Reset to Initial value
Output controlled b�
other pin-shared function
Compare Match Output Mode – PT0CCLR=1
Note: 1. With PT0CCLR=1 a Comparator A match will clear the counter
2. The PTM output pin is controlled only by the PTMA0F flag
3. The output pin is reset to its initial state by a PT0ON bit rising edge
4. A PTMP0F flag is not generated when PT0CCLR=1
Rev. 1.40
93
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Timer/Counter Mode
To select this mode, bits PT0M1 and PT0M0 in the PTM0C1 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
PTM0 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.
PWM Output Mode
To select this mode, bits PT0M1 and PT0M0 in the PTM0C1 register should be set to 10
respectively. The PWM function within the PTM0 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 PTM0 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 PT0CCLR bit has no effect on the
PWM operation. 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. 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 PT0OC bit in the PTM0C1 register is used
to select the required polarity of the PWM waveform while the two PT0IO1 and PT0IO0 bits are
used to enable the PWM output or to force the PTM0 output pin to a fixed high or low level. The
PT0POL bit is used to reverse the polarity of the PWM output waveform.
10-bit PTM, PWM Mode, Edge-aligned Mode
CCRP
1~1023
Period
1~1023
Duty
0
1024
CCRA
If fSYS = 16MHz, PTM0 clock source select fSYS/4, CCRP = 512 and CCRA = 128,
The PTM0 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. 1.40
94
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter Value
PT0� [1:0] = 10
Counter cleared
b� CCRP
Counter Reset when
PT0ON returns high
CCRP
Pause Resume
CCRA
Counter Stop if
PT0ON bit low
Time
PT0ON
PT0PAU
PT0POL
CCRA Int. Flag
PT�A0F
CCRP Int. Flag
PT�P0F
PT�0 O/P Pin
(PT0OC=1)
PT�0 O/P Pin
(PT0OC=0)
PW� Dut� C�cle
set b� CCRA
PW� Period
set b� CCRP
PW� resumes
operation
Output controlled b�
Output Inverts
other pin-shared function
When PT0POL = 1
PWM Output Mode
Note: 1. A counter clear sets the PWM Period
2. The internal PWM function continues running even when PT0IO [1:0] = 00 or 01
3. The PT0CCLR bit has no influence on PWM operation
Rev. 1.40
95
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Single Pulse Mode
To select this mode, bits PT0M1 and PT0M0 in the PTM0C1 register should be set to 10
respectively and also the PT0IO1 and PT0IO0 bits should be set to 11 respectively. The Single Pulse
Output Mode, as the name suggests, will generate a single shot pulse on the PTM0 output pin.
The trigger for the pulse output leading edge is a low to high transition of the PT0ON bit, which can
be implemented using the application program. However in the Single Pulse Mode, the PT0ON bit
can also be made to automatically change from low to high using the external TCK1 pin, which will
in turn initiate the Single Pulse output. When the PT0ON bit transitions to a high level, the counter
will start running and the pulse leading edge will be generated. The PT0ON bit should remain high
when the pulse is in its active state. The generated pulse trailing edge will be generated when the
PT0ON 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 PT0ON 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 PTM0 interrupt. The counter
can only be reset back to zero when the PT0ON bit changes from low to high when the counter
restarts. In the Single Pulse Mode CCRP is not used. The PT0CCLR bit is not used in this Mode.
Single Pulse Generation
Rev. 1.40
96
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter Value
PT0� [1:0] = 10 ; PT0IO [1:0] = 11
Counter stopped
b� CCRA
Counter Reset when
PT0ON returns high
CCRA
Pause
Counter Stops
b� software
Resume
CCRP
Time
PT0ON
Software
Trigger
Auto. set b�
TCK1 pin
Cleared b�
CCRA match
TCK1 pin
Software
Trigger
Software
Trigger
Software
Software Trigger
Clear
TCK1 pin
Trigger
PT0PAU
PT0POL
No CCRP Interrupts
generated
CCRP Int. Flag
PT�P0F
CCRA Int. Flag
PT�A0F
PT�0 O/P Pin
(PT0OC=1)
PT�0 O/P Pin
(PT0OC=0)
Output Inverts
when PT0POL = 1
Pulse Width
set b� CCRA
Single Pulse Mode
Note: 1. Counter stopped by CCRA
2. CCRP is not used
3. The pulse is triggered by the TCK1 pin or by setting the PT0ON bit high
4. A TCK1 pin active edge will automatically set the PT0ON bit hight
5. In the Single Pulse Mode, PT0IO [1:0] must be set to "11" and can not be changed.
Rev. 1.40
97
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Capture Input Mode
To select this mode bits PT0M1 and PT0M0 in the PTM0C1 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 TP1_0, TP1_1 or TCK1 pin which is selected using the PT0CKS bit in the
PTM0C1 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 PT0IO1 and PT0IO0 bits in
the PTM0C1 register. The counter is started when the PT0ON bit changes from low to high which is
initiated using the application program.
When the required edge transition appears on the TP1_0, TP1_1 or TCK1 pin the present value in
the counter will be latched into the CCRA registers and a PTM0 interrupt generated. Irrespective
of what events occur on the TP1_0, TP1_1 or TCK1 pin, the counter will continue to free run until
the PT0ON 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 PTM0 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 PT0IO1 and PT0IO0 bits can select the active trigger edge on the
TP1_0, TP1_1 or TCK1 pin to be a rising edge, falling edge or both edge types. If the PT0IO1 and
PT0IO0 bits are both set high, then no capture operation will take place irrespective of what happens
on the TP1_0, TP1_1 or TCK1 pin, however it must be noted that the counter will continue to run.
As the TP1_0, TP1_1 or TCK1 pin is pin shared with other functions, care must be taken if the
PTM0 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 PT0CCLR, PT0OC
and PT0POL bits are not used in this Mode.
Rev. 1.40
98
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Counter Value
PT0� [1:0] = 01
Counter cleared
b� CCRP
Counter Counter
Stop
Reset
CCRP
YY
Pause
Resume
XX
Time
PT0ON
PT0PAU
PT�0 capture pin
TP1_0�TP1_1
or TCK1
Active
edge
Active
edge
Active edge
CCRA Int.
Flag PT�A0F
CCRP Int.
Flag PT�P0F
CCRA
Value
PT0IO [1:0]
Value
XX
00 – Rising edge
YY
01 – Falling edge
XX
10 – Both edges
YY
11 – Disable Capture
Capture Input Mode
Note: 1. PT0M [1:0] = 01 and active edge set by the PT0IO [1:0] bits
2. A PTM0 Capture input pin active edge transfers the counter value to CCRA
3. PT0CCLR bit not used
4. No output function – PT0OC and PT0POL 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. 1.40
99
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key Function
Each device provides multiple touch key functions. The touch key function is fully integrated and
requires no external components, allowing touch key functions to be implemented by the simple
manipulation of internal registers.
Touch Key Structure
The touch keys are pin shared with the PA ~ PD logic I/O pins, with the desired function chosen via
register bits. Keys are organised into several groups, with each group known as a module and having
a module number, M0 to Mn. Each module is a fully independent set of four Touch Keys and each
Touch Key has its own oscillator. Each module contains its own control logic circuits and register
set. Examination of the register names will reveal the module number it is referring to.
Device
BS82B12A-3
BS82C16A-3
BS82D20A-3
Keys - n
Touch Key Module
Touch Key
Shared I/O Pin
M0
Key1~Key4
PB0~PB3
M1
Key5~Key8
PB4~PB7
M2
Key9~Key12
PC0~PC3
M0
Key1~Key4
PB0~PB3
M1
Key5~Key8
PB4~PB7
M2
Key9~Key12
PC0~PC3
M3
Key13~Key16
PC4~PC7
M0
Key1~Key4
PB0~PB3
M1
Key5~Key8
PB4~PB7
M2
Key9~Key12
PD3, PD2, PC0, PC1
M3
Key13~Key16
PC2~PC5
Key17~Key20
PC6, PC7,
PA4, PA1
12
16
20
M4
Touch Key Register Definition
Each touch key module, which contains four touch key functions, has its own suite registers.
The following table shows the register set for each touch key module. The Mn within the register
name refers to the Touch Key module number, the BS82B12A-3 has a range of M0 to M2, the
BS82C16A-3 has a range of M0 to M3, the BS82D20A-3 has a range of M0 to M4.
Name
TKTMR
TKC0
Usage
Touch Key 8-bit timer/counter register
Counter on-off and clear control/reference clock control/Start bit
TK16DL
Touch key module 16-bit counter low byte contents
TK16DH
Touch key module 16-bit counter high byte contents
TKC1
Touch key OSC frequency select
TKMn16DL
Module n 16-bit counter low byte contents
TKMn16DH
Module n 16-bit counter high byte contents
TKMnROL
Reference OSC internal capacitor select
TKMnROH
Reference OSC internal capacitor select
TKMnC0
Control Register 0
Multiplexer Key Select
TKMnC1
Control Register 1
Key oscillator control/Reference oscillator control/ Touch key or I/O select
Register Listing (n=0~4)
Rev. 1.40
100
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit
Register
Name
7
6
5
4
3
2
1
0
TKTMR
D7
D6
D5
D4
D3
D2
D1
D0
TKC0
—
TKRCOV
TKST
TSCS
TK16S1
TK16S0
TK16DL
D7
D6
D5
TKCFOV TK16OV
D4
D3
D2
D1
D0
TK16DH
D15
D14
D13
D12
D11
D10
D9
D8
TKC1
—
—
—
—
—
—
TKFS1
TKFS0
TKMn16DL
D7
D6
D5
D4
D3
D2
D1
D0
TKMn16DH
D15
D14
D13
D12
D11
D10
D9
D8
TKMnROL
D7
D6
D5
D4
D3
D2
D1
D0
TKMnROH
—
—
—
—
—
—
D9
D8
TKMnC0
MnMXS1 MnMXS0 MnDFEN MnFILEN MnSOFC MnSOF2 MnSOF1 MnSOF0
TKMnC1
MnTSS
—
MnROEN MnKOEN MnK4IO
MnK3IO
MnK2IO
MnK1IO
Touch Key Module (n=0~4)
TKTMR 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
Touch Key 8-bit timer/counter register
Time slot counter overflow set-up time is (256-TKTMR[7:0])×32
TKC0 Register
Bit
7
6
5
4
3
2
1
0
Name
—
TKRCOV
TKST
TKCFOV
TK16OV
TSCS
TK16S1
TK16S0
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 6TKRCOV: Time slot counter overflow flag
0: No overflow
1: Overflow
If module 0 or all module time slot counter, selected by the TSCS bit, is overflow, the
Touch Key Interrupt request flag, TKMF, will be set and all module key OSCs and ref
OSCs auto stop. All module 16-bit C/F counter, 16-bit counter, 5-bit time slot counter
and 8-bit time slot timer counter will be automatically switched off.
Bit 5TKST: Start Touch Key detection control bit
0: Stopped
0->1: Started
In all modules the16-bit C/F counter, 16-bit counter, 5-bit time slot counter will
be automatically cleared when this bit is cleared to zero (8-bit programmable time
slot counter will not be cleared, which overflow time is setup by user). When this
bit changes from low to high, the 16-bit C/F counter, 16-bit counter, 5-bit time slot
counter and 8-bit time slot timer counter will be automatically on and enable key OSC
and ref OSC output clock input to these counters.
Bit 4TKCFOV: Touch key module 16-bit C/F counter overflow flag
0: Not overflow
1: Overflow
This bit must be cleared by application program.
Rev. 1.40
101
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 3TK16OV: Touch key module 16-bit counter overflow flag
0: Not overflow
1: Overflow
This bit must be cleared by application program.
Bit 2TSCS: Touch Key time slot counter select
0: Each Module uses its own time slot counter.
1: All Touch Key Module use Module 0 time slot counter.
Bit 1~0
TK16S1~ TK16S0: The touch key module 16-bit counter clock source select
00: fSYS
01: fSYS/2
10: fSYS/4
11: fSYS/8
TKC1 Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
TKFS1
TKFS0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
1
1
Bit 7 ~2
Unimplemented, read as "0"
Bit 1~0TKFS1~TKFS0: Touch key OSC frequency select
00: 500kHz
01: 1000 kHz
10: 1500 kHz
11: 2000 kHz
TK16DL 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
Bit 7~0
Touch key module 16-bit counter low byte contents
TK16DH Register
Bit
7
6
5
4
3
2
1
0
Name
D15
D14
D13
D12
D11
D10
D9
D8
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
Bit 7~0
Touch key module 16-bit counter high byte contents
TKMn16DL 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
Bit 7~0
Rev. 1.40
Module n 16-bit counter low byte contents
102
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
TKMn16DH Register
Bit
7
6
5
4
3
2
1
0
Name
D15
D14
D13
D12
D11
D10
D9
D8
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
0
0
0
0
Bit 7~0
Module n 16-bit counter high byte contents
TKMnROL 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
Reference OSC inernal capacitor select
OSC inernal capacitor select : (TKMnRO[9:0] × 50pF) / 1024
TKMnROH Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
D9
D8
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
1
0
Bit 7~2
Unimplemented, read as "0"
Bit 1~0
Reference OSC inernal capacitor select
OSC inernal capacitor select: (TKMnRO[9:0] × 50pF) / 1024
TKMnC0 Register
Bit
Name
7
6
5
4
3
2
MnSOF1
MnSOF0
R/W
MnMXS1 MnMXS0 MnDFEN MnFILEN MnSOFC MnSOF2
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 ~6MnMXS1~MnMXS0: Multiplexer Key Select
Bit
Module Number
MnMXS1
MnMXS0
M0
M1
M2
M3
M4
0
0
Key 1
Key 5
Key 9
Key 13
Key 17
0
1
Key 2
Key 6
Key 10
Key 14
Key 18
1
0
Key 3
Key 7
Key 11
Key 15
Key 19
1
1
Key 4
Key 8
Key 12
Key 16
Key 20
Bit 5MnDFEN: Multi-frequency control
0: Disable
1: Enable
Bit 4MnFILEN: Filter function control
0: Disable
1: Enable
Bit3MnSOFC: C to F OSC frequency hopping function control
0: The frequency hopping function is controlled by MnSOF2 ~ MnSOF0 bits
1: The frequency hopping function is controlled by hardware regardless of what is
the state of MnSOF2~ MnSOF0 bits
Rev. 1.40
103
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 2~0
MnSOF2 ~ MnSOF0: Slelecting key OSC and ref OSC frequency as C to F OSC is
controlled by software
000: 1380kHz
001: 1500kHz
010: 1670kHz
011: 1830kHz
100: 2000kHz
101: 2230kHz
110: 2460kHz
111: 2740kHz
The frequency which is mentioned here willl be changed when the external or internal
capacitor is with different value. If the touch key operates at a frequency of 2MHz,
users can adjust the frequency in scale when select other frequency.
TKMnC1 Register
Bit
7
6
Name
MnTSS
—
5
4
R/W
R/W
—
R/W
POR
0
—
0
3
2
1
0
MnK4IO
MnK3IO
MnK2IO
MnK1IO
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
MnROEN MnKOEN
Bit 7 MnTSS: Time slot counter clock select
0: Reference oscillator
1: fSYS/4
Bit 6
Unimplemented, read as "0"
Bit 5MnROEN: Reference OSC control
0: Disable
1: Enable
Bit 4
MnKOEN: Key OSC control
0: Disable
1: Enable
Bit 3~0
MnK4IO~ MnK1IO: I/O pin or touch key function select
MnK4IO
M1
M2
PC3/Key 12
PB3/Key 4 PB7/Key 8
or PC1/Key 12
0
I/O
1
Touch key
MnK3IO
M0
M1
I/O
1
Touch key
M0
M1
0
I/O
Touch key
M0
M1
PB0/Key 1 PB4/Key 5
M4
PA1/Key 20
M3
M4
PC6/Key15
or PC4/Key 15
PA4/Key 19
M3
M4
M2
PC1/Key 10
PB1/Key 2 PB5/Key 6
or PD2/Key 10
1
MnK1IO
M3
PC7/Key 16
or PC5/Key 16
M2
PC2/Key 11
PB2/Key 3 PB6/Key 7
or PC0/Key 11
0
MnK2IO
Rev. 1.40
M0
PC5/Key 14
PC7/Key 18
or PC3/Key 14
M2
PC0/Key 9
or PD3/Key 9
M3
0
I/O
1
Touch key input
104
M4
PC4/Key 13
PC6/Key 17
or PC2/Key 13
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key Operation
When a finger touches or is in proximity to a touch pad, the capacitance of the pad will increase.
By using this capacitance variation to change slightly the frequency of the internal sense oscillator,
touch actions can be sensed by measuring these frequency changes. Using an internal programmable
divider the reference clock is used to generate a fixed time period. By counting a number of
generated clock cycles from the sense oscillator during this fixed time period touch key actions can
be determined.
Each touch key module contains four touch key inputs which are shared logical I/O pins, and
the desired function is selected using register bits. Each touch key has its own independent sense
oscillator. There are therefore four sense oscillators within each touch key module.
During this reference clock fixed interval, the number of clock cycles generated by the sense
oscillator is measured, and it is this value that is used to determine if a touch action has been made
or not. At the end of the fixed reference clock time interval a Touch Key interrupt signal will be
generated.
Using the TSCS bit in the TKC0 register can select the module 0 time slot counter as the time slot
counter for all modules. All modules use the same started signal. The16-bit C/F counter, 16-bit
counter, 5-bit time slot counter in all modules will be automatically cleared when this bit is cleared
to zero, but the 8-bit programmable time slot counter will not be cleared. The overflow time is setup
by user. When this bit changes from low to high, the 16-bit C/F counter, 16-bit counter, 5-bit time
slot counter and 8-bit time slot timer counter will be automatically switched on.
The key oscillator and reference oscillator in all modules will be automatically stopped and the
16-bit C/F counter, 16-bit counter, 5-bit time slot counter and 8-bit time slot timer counter will be
automatically switched off when the 5-bit time slot counter overflows. The clock source for the time
slot counter and 8+5 bit counter, is sourced from the reference oscillator or fSYS/4. The reference
oscillator and key oscillator will be enabled by setting the MnROEN bit and MnKOEN bits in the
TKMnC1 register.
When the time slot counter in all the touch key modules or in the touch key module 0 overflows,
an actual touch key interrupt will take place. The touch keys mentioned here are the keys which are
enabled.
Each touch key module consists of four touch keys, Key1 ~ Key4 are contained in module 0, Key5
~ Key8 are contained in module 1, Key9 ~ Key12 are contained in module 2, Key13 ~ Key16 are
contained in the module 3 and Key17 ~ Key20 are contained in the module 4. Each touch key
module has an identical structure.
Rev. 1.40
105
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
KEY 1
KEY
OSC
KEY �
KEY
OSC
�UX.
KEY 3
KEY
OSC
KEY 4
KEY
OSC
fSYS�fSYS/��fSYS/4�fSYS/8
Filter
1�-bit C/F
counter
�ultifrequenc�
Overflow
Overflow
1�-bit counter
TK1�S1~TK1�S0
�nTSS
üüü
�UX.
fSYS/4
8-bit time slot
timer counter
�-bit time slot
counter
8-bit time slot timer counter
preload register
Overflow
Overflow
Note: 1. Each touch key module contains the content in the red dash line.
2. The content in the black dash line is the module number (0~n). Each module contains 4 touch keys.
Touch Key Module Block Diagram
Rev. 1.40
106
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
The touch key sense oscilltor and reference oscillator timing diagram is shown in the following
figure:
TKST
�nKOEN
�nROEN
Hardware clear to "0"
KEY OSC CLK
Reference OSC CLK
(��-TKT�R) overflow *3�
fCFT�CK enable
fCFT�CK (�nDFEN=0)
fCFT�CK (�nDFEN=1)
TKRCOV
Set Touch Ke� interrupt request flag

Touch Key or I/O Function Select
Rev. 1.40
107
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Touch Key Interrupt
The touch key only has single interrupt, when the time slot counter in all the touch key modules or
in the touch key module 0 overflows, an actual touch key interrupt will take place. The touch keys
mentioned here are the keys which are enabled. The 16-bit C/F counter, 16-bit counter, 5-bit time
slot counter and 8-bit time slot counter in all modules will be automatically cleared.
The TKCFOV flag, which is the 16-bit C/F counter overflow flag will go high when any of the
Touch Key Module 16-bit C/F counter overflows. As this flag will not be automatically cleared, it
has to be cleared by the application program.
Module 0 only contains one 16-bit counter. The TK16OV flag, which is the 16-bit counter overflow
flag, will go high when the 16-bit counter overflows. As this flag will not be automatically cleared,
it has to be cleared by the application program. More details regarding the touch key interrupt is
located in the interrupt section of the datasheet.
Programming Considerations
After the relevant registers are setup, the touch key detection process is initiated the changing the
TKST bit from low to high. This will enable and synchronise all relevant oscillators. The TKRCOV
flag, which is the time slot counter flag will go high and remain high until the counter overflows.
When this happens an interrupt signal will be generated.
When the external touch key size and layout are defined, their related capacitances will then
determine the sensor oscillator frequency.
Rev. 1.40
108
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
I2C Interface
The I 2C interface is used to communicate with external peripheral devices such as sensors,
EEPROM memory etc. Originally developed by Philips, it is a two line low speed serial interface
for synchronous serial data transfer. The advantage of only two lines for communication, relatively
simple communication protocol and the ability to accommodate multiple devices on the same bus
has made it an extremely popular interface type for many applications.
I2C Master/Slave Bus Connection

I C Block Diagram
2
I2C Interface Operation
The I2C serial interface is a two line interface, a serial data line, SDA, and serial clock line, SCL. As
many devices may be connected together on the same bus, their outputs are both open drain types.
For this reason it is necessary that external pull-high resistors are connected to these outputs. Note
that no chip select line exists, as each device on the I2C bus is identified by a unique address which
will be transmitted and received on the I2C bus.
When two devices communicate with each other on the bidirectional I2C bus, one is known as the
master device and one as the slave device. Both master and slave can transmit and receive data,
however, it is the master device that has overall control of the bus. For these devices, which only
operate in slave mode, there are two methods of transferring data on the I2C bus, the slave transmit
mode and the slave receive mode.
It is suggested that the user shall not enter the micro processor to HALT status by application
program during processing I2C communication.
If the pin is configured to SDA or SCL function of I2C interface, the pin is configured to open-collect
Input/Output port and its Pull-high function can be enabled by programming the related Generic
Pull-high Control Register.
Rev. 1.40
109
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
S T A R T s ig n a l
fro m M a s te r
S e n d s la v e a d d r e s s
a n d R /W b it fr o m M a s te r
A c k n o w le d g e
fr o m s la v e
S e n d d a ta b y te
fro m M a s te r
A c k n o w le d g e
fr o m s la v e
S T O P s ig n a l
fro m M a s te r
The I2CDBNC1 and I2CDBNC0 Bits determine the debounce time of the I2C interface. This uses
the system clock to in effect add a debounce time to the external clock to reduce the possibility
of glitches on the clock line causing erroneous operation. The debounce time, if selected, can be
chosen to be either 2 or 4 system clocks. To achieve the required I2C data transfer speed, there
exists a relationship between the system clock, fSYS, and the I2C debounce time. For either the I2C
Standard or Fast mode operation, users must take care of the selected system clock frequency and
the configured debounce time to match the criterion shown in the following table.
I2C Debounce Time Selection
I2C Standard Mode (100kHz)
I2C Fast Mode (400kHz)
No Debounce
fSYS > 2MHz
fSYS > 5MHz
2 system clock debounce
fSYS > 4MHz
fSYS > 10MHz
4 system clock debounce
fSYS > 8MHz
fSYS > 20MHz
I C Minimum fSYS Frequency
2
I2C Registers
There are four control registers associated with the I2C bus, IICC0, IICC1, IICA and I2CTOC and
one data register, IICD. The IICD register is used to store the data being transmitted and received on
the I2C bus. Before the microcontroller writes data to the I2C bus, the actual data to be transmitted
must be placed in the IICD register. After the data is received from the I2C bus, the microcontroller
can read it from the IICD register. Any transmission or reception of data from the I2C bus must be
made via the IICD register.
Bit
Register
Name
7
6
5
4
IICC0
—
—
—
—
IICC1
IICHCF
IICHAAS
IICHBB
IICHTX
IICTXAK
IICSRW
IICD
IICD7
IICD6
IICD5
IICD4
IICD3
IICD2
IICA
IICA6
IICA5
IICA4
IICA3
I2CTOC I2CTOEN I2CTOF I2CTOS5 I2CTOS4
3
2
I2CDBNC1 I2CDBNC0
IICA2
IICA1
I2CTOS3
I2CTOS2
1
0
IICEN
—
IICAMWU IICRXAK
IICD1
IICD0
IICA0
—
I2CTOS1 I2CTOS0
I2C Registers List
Rev. 1.40
110
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
IICC0 Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
I2CDBNC1
I2CDBNC0
IICEN
—
R/W
—
—
—
—
R/W
R/W
R/W
—
POR
—
—
—
—
0
0
0
—
Bit 7~4
Unimplemented, read as "0"
Bit 3~2I2CDBNC1~I2CDBNC0: I2C Debounce Time Selection
00: No debounce
01: 2 system clock debounce
10: 4 system clock debounce
11: 4 system clock debounce
Bit 1
Bit 0 IICEN: I2C Control
0: Disable
1: Enable
Unimplemented, read as "0"
The I2C function could be turned off or turned on by controlling the bit IICEN. When the pinshared I/O ports are chosen to be the functions other than SDA and SCL by clearing the IICEN bit to
zero, the I2C function is turned off and its operating current will be reduced to a minimum value. In
contrary, the I2C function is turned on when the pin-shared I/O ports are chosen to be the SDA and
SCL pins by setting the IICEN bit high.
IICC1 Register
Bit
7
6
5
4
3
2
Name
IICHCF
IICHAAS
IICHBB
IICHTX
IICTXAK
IICSRW
1
0
R/W
R
R
R
R/W
R/W
R
R/W
R
POR
1
0
0
0
0
0
0
1
IICAMWU IICRXAK
Bit 7 IICHCF: I2C Bus data transfer completion flag
0: Data is being transferred
1: Completion of an 8-bit data transfer
The IICHCF flag is the data transfer flag. This flag will be zero when data is being
transferred. Upon completion of an 8-bit data transfer the flag will go high and an
interrupt will be generated. Below is an example of the flow of a two-byte I2C data
transfer.
First, the I2C slave device receives a start signal from the I2C master and then the
IICHCF bit is automatically cleared to zero. Second, the I2C slave device finishes
receiving the 1st data byte and then the IICHCF bit is automatically set to one. Third,
users read the 1st data byte from the IICD register by the application program and then
the IICHCF bit is automatically cleared to zero. Fourth, the I2C slave device finishes
receiving the 2nd data byte and then the IICHCF bit is automatically set high and so
on. Finally, the I2C slave device receives a stop signal from the I2C master and then the
IICHCF bit is automatically set high.
Bit 6IICHAAS: I2C Bus address match flag
0: Not address match
1: Address match
The IICHASS flag is the address match flag. This flag is used to determine if the slave
device address is same as the master transmit address. If the addresses match then this
bit will be high, if there is no match then the flag will be low.
Rev. 1.40
111
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 5IICHBB: I2C Bus busy flag
0: I2C Bus is not busy
1: I2C Bus is busy
The IICHBB flag is the I2C busy flag. This flag will be "1" when the I2C bus is busy
which will occur when a START signal is detected. The flag will be set to "0" when
the bus is free which will occur when a STOP signal is detected.
Bit 4IICHTX: Select I2C slave device is transmitter or receiver
0: Slave device is the receiver
1: Slave device is the transmitter
Bit 3
IICTXAK: I2C Bus transmit acknowledge flag
0: Slave send acknowledge flag
1: Slave do not send acknowledge flag
The IICTXAK bit is the transmit acknowledge flag. After the slave device receipt of
8-bits of data, this bit will be transmitted to the bus on the 9th clock from the slave
device. The slave device must always clear the IICTXAK bit to zero before further
data is received.
Bit 2
IICSRW: I2C Slave Read/Write flag
0: Slave device should be in receive mode
1: Slave device should be in transmit mode
The IICSRW flag is the I2C Slave Read/Write flag. This flag determines whether
the master device wishes to transmit or receive data from the I2C bus. When the
transmitted address and slave address is match, that is when the IICHAAS flag is set
high, the slave device will check the IICSRW flag to determine whether it should be
in transmit mode or receive mode. If the IICSRW flag is high, the master is requesting
to read data from the bus, so the slave device should be in transmit mode. When the
IICSRW flag is zero, the master will write data to the bus, therefore the slave device
should be in receive mode to read this data.
Bit 1IICAMWU: I2C Address Match Control
0: Disable
1: Enable – must be cleared by the application program after wake-up.
This Bit should be set to “1” to enable the I2C address match wake up from the SLEEP
or IDLE Mode. If the IAMWU Bit has been set before entering either the SLEEP or
IDLE mode to enable the I2C address match wake up, then this Bit must be cleared by
application program after wake-up to ensure correction device operation.
Bit 0
Rev. 1.40
IICRXAK: I2C Bus Receive acknowledge flag
0: Slave receive acknowledge flag
1: Slave do not receive acknowledge flag
The IICRXAK flag is the receiver acknowledge flag. When the IICRXAK flag is "0",
it means that a acknowledge signal has been received at the 9th clock, after 8 bits of
data have been transmitted. When the slave device in the transmit mode, the slave
device checks the IICRXAK flag to determine if the master receiver wishes to receive
the next byte. The slave transmitter will therefore continue sending out data until the
IICRXAK flag is "1". When this occurs, the slave transmitter will release the SDA line
to allow the master to send a STOP signal to release the I2C Bus.
112
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
I2CTOC Register
Bit
7
6
Name
I2CTOEN
I2CTOF
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 5
4
3
2
1
0
I2CTOS5 I2CTOS4 I2CTOS3 I2CTOS2 I2CTOS1 I2CTOS0
I2CTOEN: I2C Time-out Countrol
0: Disable
1: Enable
Bit 6IICTOF: I2C Time-out flag
0: No time-out occurred
1: Time-out occurred
This bit is set high when time-out occurs and can only be cleared by application
program.
Bit 5~0I2CTOS5~I2CTOS0: I2C Time-out period selection
I2C time-out clock source is fSUB/32.
I2C time-out period is equal to (I2CTOS[5 : 0]+1) × (32/fSUB)
The IICD register is used to store the data being transmitted and received. Before the device writes
data to the I2C bus, the actual data to be transmitted must be placed in the IICD register. After the
data is received from the I2C bus, the device can read it from the IICD register. Any transmission or
reception of data from the I2C bus must be made via the IICD register.
IICD Register
Bit
7
6
5
4
3
2
1
0
Name
IICD7
IICD6
IICD5
IICD4
IICD3
IICD2
IICD1
IICD0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
"x" unknown
IICA Register
Rev. 1.40
Bit
7
6
5
4
3
2
1
0
Name
IICA6
IICA5
IICA4
IICA3
IICA2
IICA1
IICA0
—
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 7~1 IICA6~IICA0: I2C slave address
IICA6~ IICA0 is the I2C slave address bit 6 ~ bit 0.
The IICA register is the location where the 7-bit slave address of the slave device
is stored. Bits 7~ 1 of the IICA register define the device slave address. Bit 0 is not
defined.
When a master device, which is connected to the I2C bus, sends out an address, which
matches the slave address in the IICA register, the slave device will be selected.
Bit 0
Unimplemented, read as "0"
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I2C Bus Communication
Communication on the I2C bus requires four separate steps, a START signal, a slave device address
transmission, a data transmission and finally a STOP signal. When a START signal is placed on
the I2C bus, all devices on the bus will receive this signal and be notified of the imminent arrival of
data on the bus. The first seven bits of the data will be the slave address with the first bit being the
MSB. If the address of the slave device matches that of the transmitted address, the IICHAAS bit
in the IICC1 register will be set and an I2C interrupt will be generated. After entering the interrupt
service routine, the slave device must first check the condition of the IICHAAS and I2CTOF
bits to determine whether the interrupt source originates from an address match or from an I2C
communication time-out or from the completion of an 8-bit data transfer. During a data transfer, note
that after the 7-bit slave address has been transmitted, the following bit, which is the 8th bit, is the
read/write bit whose value will be placed in the IICSRW bit. This bit will be checked by the slave
device to determine whether to go into transmit or receive mode. Before any transfer of data to or
from the I2C bus, the microcontroller must initialise the bus, the following are steps to achieve this:
• Step 1
Set the IICEN bit in the IICC0 register high to enable the I2C bus.
• Step 2
Write the slave address of the device to the I2C bus address register IICA.
• Step 3
Set the IICE interrupt enable bit of the interrupt control register to enable the I2C interrupt.

I2C Bus Initialisation Flow Chart
I2C Bus Start Signal
The START signal can only be generated by the master device connected to the I2C bus and not by
the slave device. This START signal will be detected by all devices connected to the I2C bus. When
detected, this indicates that the I2C bus is busy and therefore the IICHBB bit will be set. A START
condition occurs when a high to low transition on the SDA line takes place when the SCL line
remains high.
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Slave Address
The transmission of a START signal by the master will be detected by all devices on the I2C bus.
To determine which slave device the master wishes to communicate with, the address of the slave
device will be sent out immediately following the START signal. All slave devices, after receiving
this 7-bit address data, will compare it with their own 7-bit slave address. If the address sent out by
the master matches the internal address of the microcontroller slave device, then an internal I2C bus
interrupt signal will be generated. The next bit following the address, which is the 8th bit, defines
the read/write status and will be saved to the IICSRW bit of the IICC1 register. The slave device will
then transmit an acknowledge bit, which is a low level, as the 9th bit. The slave device will also set
the status flag IICHAAS when the addresses match.
As an I2C bus interrupt can come from three sources, when the program enters the interrupt
subroutine, the IICHAAS and I2CTOF bits should be examined to see whether the interrupt source
has come from a matching slave address or from an I2C communication time-out or from the
completion of a data byte transfer. When a slave address is matched, the device must be placed in
either the transmit mode and then write data to the IICD register, or in the receive mode where it
must implement a dummy read from the IICD register to release the SCL line.
I2C Bus Read/Write Signal
The IICSRW bit in the IICC1 register defines whether the slave device wishes to read data from the
I2C bus or write data to the I2C bus. The slave device should examine this bit to determine if it is
to be a transmitter or a receiver. If the IICSRW flag is "1" then this indicates that the master device
wishes to read data from the I2C bus, therefore the slave device must be setup to send data to the I2C
bus as a transmitter. If the IICSRW flag is "0" then this indicates that the master wishes to send data
to the I2C bus, therefore the slave device must be setup to read data from the I2C bus as a receiver.
I2C Bus Slave Address Acknowledge Signal
After the master has transmitted a calling address, any slave device on the I2C bus, whose own
internal address matches the calling address, must generate an acknowledge signal. The acknowledge
signal will inform the master that a slave device has accepted its calling address. If no acknowledge
signal is received by the master then a STOP signal must be transmitted by the master to end the
communication. When the IICHAAS flag is high, the addresses have matched and the slave device
must check the IICSRW flag to determine if it is to be a transmitter or a receiver. If the IICSRW flag
is high, the slave device should be setup to be a transmitter so the IICHTX bit in the IICC1 register
should be set high. If the IICSRW flag is low, then the microcontroller slave device should be setup
as a receiver and the IICHTX bit in the IICC1 register should be cleared to zero.
I2C Bus Data and Acknowledge Signal
The transmitted data is 8-bits wide and is transmitted after the slave device has acknowledged
receipt of its slave address. The order of serial bit transmission is the MSB first and the LSB last.
After receipt of 8-bits of data, the receiver must transmit an acknowledge signal, level "0", before
it can receive the next data byte. If the slave transmitter does not receive an acknowledge bit signal
from the master receiver, then the slave transmitter will release the SDA line to allow the master
to send a STOP signal to release the I2C Bus. The corresponding data will be stored in the IICD
register. If setup as a transmitter, the slave device must first write the data to be transmitted into the
IICD register. If setup as a receiver, the slave device must read the transmitted data from the IICD
register.
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Touch 8-Bit Flash MCU with LED/LCD Driver
When the slave receiver receives the data byte, it must generate an acknowledge bit, known as
IICTXAK, on the 9th clock. The slave device, which is setup as a transmitter will check the
IICRXAK bit in the IICC1 register to determine if it is to send another data byte, if not then it will
release the SDA line and await the receipt of a STOP signal from the master.

Note: *When a slave address is matched, the device must be placed in either the transmit mode and
then write data to the IICD register, or in the receive mode where it must implement a dummy
read from the IICD register to release the SCL line.
I2C Communication Timing Diagram

I2C Bus ISR Flow Chart
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I2C Interface Time-out Function
In order to reduce the problem of I2C lockup due to reception of erroneous clock sources, clock, a
time-out function is provided. If the clock source to the I2C is not received then after a fixed time
period, the I2C circuitry and registers will be reset.

I2C Time-out
When an I2C time-out counter overflow occurs, the counter will stop and the I2CTOEN bit will be
cleared to zero and the I2CTOF bit will be set high to indicate that a time-out condition as occurred.
The time-out condition will also generate an interrupt which uses the I2C interrrupt vector. When
an I2C time-out occurs, the I2C internal circuitry will be reset and the registers will be reset into the
following condition:
Register
After I2C Time-out
IICD, IICA, IICC0
No change
IICC1
Reset to POR condition
I2C Registers After Time-out
The I2CTOF flag can be cleared by the application program. There are 64 time-out periods which
can be selected using bits in the I2CTOC register. The time-out time is given by the formula:
((1~64) × 32) / fSUB
This gives a range of about 1ms to 64ms.
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UART Interface
The devices contain an integrated full-duplex asynchronous serial communications UART interface
that enables communication with external devices that contain a serial interface. The UART function
has many features and can transmit and receive data serially by transferring a frame of data with
eight or nine data bits per transmission as well as being able to detect errors when the data is
overwritten or incorrectly framed. The UART function possesses its own internal interrupt which
can be used to indicate when a reception occurs or when a transmission terminates.
The integrated UART function contains the following features:
• Full-duplex, Universal Asynchronous Receiver and Transmitter (UART) communication
• 8 or 9 bits character length
• Even, odd or no parity options
• One or two stop bits
• Baud rate generator with 8-bit prescaler
• Parity, framing, noise and overrun error detection
• Support for interrupt on address detect (last character bit=1)
• Transmitter and receiver enabled independently
• 2-byte Deep FIFO Receive Data Buffer
• Transmit and Receive Multiple Interrupt Generation Sources:
♦♦
Transmitter Empty
♦♦
Transmitter Idle
♦♦
Receiver Full
♦♦
Receiver Overrun
♦♦
Address Mode Detect
♦♦
RX pin wake-up interrupt (RX enable, RX falling edge)
UART External Pin Interfacing
To communicate with an external serial interface, the internal UART has two external pins known
as TX and RX. The TX and RX pins are the UART transmitter and receiver pins respectively. Along
with the UARTEN bit, the TXEN and RXEN bits, if set, will automatically setup these I/O or other
pin-shared functional pins to their respective TX output and RX input conditions and disable any
pull-high resistor option which may exist on the TX or RX pins. When the TX or RX pin function
is disabled by clearing the UARTEN and TXEN or RXEN bit, the TX or RX pin can be used as a
general purpose I/O or other pin-shared functional pin.
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UART Data Transfer Scheme
The block diagram shows the overall data transfer structure arrangement for the UART interface.
The actual data to be transmitted from the MCU is first transferred to the TXR register by the
application program. The data will then be transferred to the Transmit Shift Register from where it
will be shifted out, LSB first, onto the TX pin at a rate controlled by the Baud Rate Generator. Only
the TXR register is mapped onto the MCU Data Memory, the Transmit Shift Register is not mapped
and is therefore inaccessible to the application program.
Data to be received by the UART is accepted on the external RX pin, from where it is shifted in,
LSB first, to the Receiver Shift Register at a rate controlled by the Baud Rate Generator. When
the shift register is full, the data will then be transferred from the shift register to the internal RXR
register, where it is buffered and can be manipulated by the application program. Only the RXR
register is mapped onto the MCU Data Memory, the Receiver Shift Register is not mapped and is
therefore inaccessible to the application program.
It should be noted that the actual register for data transmission and reception, although referred to
in the text, and in application programs, as separate TXR and RXR registers, only exists as a single
shared register in the Data Memory. This shared register known as the TXR_RXR register is used
for both data transmission and data reception.
�SB
Transmitter Shift Register
………………………… LSB
TX Pin
CLK
RX Pin
�SB
LSB
CLK
Baud Rate
Generator
TXR Register
Receiver Shift Register
…………………………
RXR Register
Buffer
�CU Data Bus
UART Data Transfer Scheme
UART Status and Control Registers
There are five control registers associated with the UART function. The USR, UCR1 and UCR2
registers control the overall function of the UART, while the BRG register controls the Baud rate.
The actual data to be transmitted and received on the serial interface is managed through the TXR_
RXR data register.
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
USR
PERR
NF
FERR
OERR
RIDLE
RXIF
TIDLE
TXIF
UCR1
UARTEN
BNO
PREN
PRT
STOPS
TXBRK
RX8
TX8
UCR2
TXEN
RXEN
BRGH
ADDEN
WAKE
RIE
TIIE
TEIE
TXR_RXR
TXRX7
TXRX6
TXRX5
TXRX4
TXRX3
TXRX2
TXRX1
TXRX0
BRG
BRG7
BRG6
BRG5
BRG4
BRG3
BRG2
BRG1
BRG0
UART Register List
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USR register
The USR register is the status register for the UART, which can be read by the program to determine
the present status of the UART. All flags within the USR register are read only. Further explanation
on each of the flags is given below.
Bit
7
6
5
4
3
2
1
0
Name
PERR
NF
FERR
OERR
RIDLE
RXIF
TIDLE
TXIF
R/W
R
R
R
R
R
R
R
R
POR
0
0
0
0
1
0
1
1
Bit 7PERR: Parity error flag
0: No parity error is detected
1: Parity error is detected
The PERR flag is the parity error flag. When this read only flag is "0", it indicates a
parity error has not been detected. When the flag is "1", it indicates that the parity of
the received word is incorrect. This error flag is applicable only if Parity mode (odd or
even) is selected. The flag can also be cleared by a software sequence which involves
a read to the status register USR followed by an access to the RXR data register.
Bit 6NF: Noise flag
0: No noise is detected
1: Noise is detected
The NF flag is the noise flag. When this read only flag is "0", it indicates no noise
condition. When the flag is "1", it indicates that the UART has detected noise on the
receiver input. The NF flag is set during the same cycle as the RXIF flag but will not
be set in the case of as overrun. The NF flag can be cleared by a software sequence
which will involve a read to the status register USR followed by an access to the RXR
data register.
Bit 5FERR: Framing error flag
0: No framing error is detected
1: Framing error is detected
The FERR flag is the framing error flag. When this read only flag is "0", it indicates
that there is no framing error. When the flag is "1", it indicates that a framing error
has been detected for the current character. The flag can also be cleared by a software
sequence which will involve a read to the status register USR followed by an access to
the RXR data register.
Bit 4OERR: Overrun error flag
0: No overrun error is detected
1: Overrun error is detected
The OERR flag is the overrun error flag which indicates when the receiver buffer has
overflowed. When this read only flag is "0", it indicates that there is no overrun error.
When the flag is "1", it indicates that an overrun error occurs which will inhibit further
transfers to the RXR receive data register. The flag is cleared by a software sequence,
which is a read to the status register USR followed by an access to the RXR data
register.
Bit 3RIDLE: Receiver status
0: Data reception is in progress (data being received)
1: No data reception is in progress (receiver is idle)
The RIDLE flag is the receiver status flag. When this read only flag is "0", it indicates
that the receiver is between the initial detection of the start bit and the completion of
the stop bit. When the flag is "1", it indicates that the receiver is idle. Between the
completion of the stop bit and the detection of the next start bit, the RIDLE bit is "1"
indicating that the UART receiver is idle and the RX pin stays in logic high condition.
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Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 2RXIF: Receive RXR data register status
0: RXR data register is empty
1: RXR data register has available data
The RXIF flag is the receive data register status flag. When this read only flag is "0",
it indicates that the RXR read data register is empty. When the flag is "1", it indicates
that the RXR read data register contains new data. When the contents of the shift
register are transferred to the RXR register, an interrupt is generated if RIE=1 in the
UCR2 register. If one or more errors are detected in the received word, the appropriate
receive-related flags NF, FERR, and/or PERR are set within the same clock cycle. The
RXIF flag is cleared when the USR register is read with RXIF set, followed by a read
from the RXR register, and if the RXR register has no data available.
Bit 1TIDLE: Transmission idle
0: Data transmission is in progress (data being transmitted)
1: No data transmission is in progress (transmitter is idle)
The TIDLE flag is known as the transmission complete flag. When this read only
flag is "0", it indicates that a transmission is in progress. This flag will be set to "1"
when the TXIF flag is "1" and when there is no transmit data or break character being
transmitted. When TIDLE is equal to "1", the TX pin becomes idle with the pin state
in logic high condition. The TIDLE flag is cleared by reading the USR register with
TIDLE set and then writing to the TXR register. The flag is not generated when a data
character or a break is queued and ready to be sent.
Bit 0TXIF: Transmit TXR data register status
0: Character is not transferred to the transmit shift register
1: Character has transferred to the transmit shift register (TXR data register is empty)
The TXIF flag is the transmit data register empty flag. When this read only flag is "0",
it indicates that the character is not transferred to the transmitter shift register. When
the flag is "1", it indicates that the transmitter shift register has received a character
from the TXR data register. The TXIF flag is cleared by reading the UART status
register (USR) with TXIF set and then writing to the TXR data register. Note that
when the TXEN bit is set, the TXIF flag bit will also be set since the transmit data
register is not yet full.
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UCR1 register
The UCR1 register together with the UCR2 register are the two UART control registers that are used
to set the various options for the UART function, such as overall on/off control, parity control, data
transfer bit length etc. Further explanation on each of the bits is given below.
Bit
7
6
5
4
3
2
1
0
Name
UARTEN
BNO
PREN
PRT
STOPS
TXBRK
RX8
TX8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
W
POR
0
0
0
0
0
0
x
0
"x" unknown
Bit 7UARTEN: UART function enable control
0: Disable UART. TX and RX pins are as I/O or other pin-shared functional pins
1: Enable UART. TX and RX pins function as UART pins
The UARTEN bit is the UART enable bit. When this bit is equal to "0", the UART
will be disabled and the RX pin as well as the TX pin will be as General Purpose I/
O or other pin-shared functional pins. When the bit is equal to "1", the UART will be
enabled and the TX and RX pins will function as defined by the TXEN and RXEN
enable control bits.
When the UART is disabled, it will empty the buffer so any character remaining in
the buffer will be discarded. In addition, the value of the baud rate counter will be
reset. If the UART is disabled, all error and status flags will be reset. Also the TXEN,
RXEN, TXBRK, RXIF, OERR, FERR, PERR and NF bits will be cleared, while the
TIDLE, TXIF and RIDLE bits will be set. Other control bits in UCR1, UCR2 and
BRG registers will remain unaffected. If the UART is active and the UARTEN bit is
cleared, all pending transmissions and receptions will be terminated and the module
will be reset as defined above. When the UART is re-enabled, it will restart in the
same configuration.
Bit 6BNO: Number of data transfer bits selection
0: 8-bit data transfer
1: 9-bit data transfer
This bit is used to select the data length format, which can have a choice of either
8-bit or 9-bit format. When this bit is equal to "1", a 9-bit data length format will be
selected. If the bit is equal to "0", then an 8-bit data length format will be selected. If
9-bit data length format is selected, then bits RX8 and TX8 will be used to store the
9th bit of the received and transmitted data respectively.
Note: 1. If BNO=1 (9-bit data transfer), parity function is enabled, the 9th bit of data
is the parity bit which will not be transferred to RX8.
2. If BNO=0 (8-bit data transfer), parity function is enabled, the 8th bit of data
is the parity bit which will not be transferred to RX7.
Bit 5PREN: Parity function enable control
0: Parity function is disabled
1: Parity function is enabled
This is the parity enable bit. When this bit is equal to "1", the parity function will be
enabled. If the bit is equal to "0", then the parity function will be disabled.
Bit 4PRT: Parity type selection bit
0: Even parity for parity generator
1: Odd parity for parity generator
This bit is the parity type selection bit. When this bit is equal to "1", odd parity type
will be selected. If the bit is equal to "0", then even parity type will be selected.
Bit 3STOPS: Number of stop bits selection
0: One stop bit format is used
1: Two stop bits format is used
This bit determines if one or two stop bits are to be used for the TX pin. When this bit is
equal to "1", two stop bits are used. If this bit is equal to "0", then only one stop bit is used.
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Bit 2TXBRK: Transmit break character
0: No break character is transmitted
1: Break characters transmit
The TXBRK bit is the Transmit Break Character bit. When this bit is "0", there are
no break characters and the TX pin operates normally. When the bit is "1", there are
transmit break characters and the transmitter will send logic zeros. When this bit is
equal to "1", after the buffered data has been transmitted, the transmitter output is held
low for a minimum of a 13-bit length and until the TXBRK bit is reset.
Bit 1RX8: Receive data bit 8 for 9-bit data transfer format (read only)
This bit is only used if 9-bit data transfers are used, in which case this bit location will
store the 9th bit of the received data known as RX8. The BNO bit is used to determine
whether data transfers are in 8-bit or 9-bit format.
Bit 0TX8: Transmit data bit 8 for 9-bit data transfer format (write only)
This bit is only used if 9-bit data transfers are used, in which case this bit location
will store the 9th bit of the transmitted data known as TX8. The BNO bit is used to
determine whether data transfers are in 8-bit or 9-bit format.
UCR2 register
The UCR2 register is the second of the two UART control registers and serves several purposes. One
of its main functions is to control the basic enable/disable operation of the UART Transmitter and
Receiver as well as enabling the various UART interrupt sources. The register also serves to control
the baud rate speed, receiver wake-up enable and the address detect enable. Further explanation on
each of the bits is given below.
Bit
7
6
5
4
3
2
1
0
Name
TXEN
RXEN
BRGH
ADDEN
WAKE
R/W
R/W
R/W
R/W
R/W
R/W
RIE
TIIE
TEIE
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7TXEN: UART Transmitter enabled control
0: UART transmitter is disabled
1: UART transmitter is enabled
The bit named TXEN is the Transmitter Enable Bit. When this bit is equal to "0", the
transmitter will be disabled with any pending data transmissions being aborted. In
addition the buffers will be reset. In this situation the TX pin will be used as an I/O or
other pin-shared functional pin.
If the TXEN bit is equal to "1" and the UARTEN bit is also equal to "1", the
transmitter will be enabled and the TX pin will be controlled by the UART. Clearing
the TXEN bit during a transmission will cause the data transmission to be aborted and
will reset the transmitter. If this situation occurs, the TX pin will be used as an I/O or
other pin-shared functional pin.
Bit 6RXEN: UART Receiver enabled control
0: UART receiver is disabled
1: UART receiver is enabled
The bit named RXEN is the Receiver Enable Bit. When this bit is equal to "0", the
receiver will be disabled with any pending data receptions being aborted. In addition
the receive buffers will be reset. In this situation the RX pin will be used as an I/O or
other pin-shared functional pin. If the RXEN bit is equal to "1" and the UARTEN bit
is also equal to "1", the receiver will be enabled and the RX pin will be controlled by
the UART. Clearing the RXEN bit during a reception will cause the data reception to
be aborted and will reset the receiver. If this situation occurs, the RX pin will be used
as an I/O or other pin-shared functional pin.
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Bit 5BRGH: Baud Rate speed selection
0: Low speed baud rate
1: High speed baud rate
The bit named BRGH selects the high or low speed mode of the Baud Rate Generator.
This bit, together with the value placed in the baud rate register BRG, controls the
Baud Rate of the UART. If this bit is equal to "1", the high speed mode is selected. If
the bit is equal to "0", the low speed mode is selected.
Bit 4ADDEN: Address detect function enable control
0: Address detection function is disabled
1: Address detection function is enabled
The bit named ADDEN is the address detect function enable control bit. When this
bit is equal to "1", the address detect function is enabled. When it occurs, if the 8th
bit, which corresponds to RX7 if BNO=0 or the 9th bit, which corresponds to RX8 if
BNO=1, has a value of "1", then the received word will be identified as an address,
rather than data. If the corresponding interrupt is enabled, an interrupt request will be
generated each time the received word has the address bit set, which is the 8th or 9th
bit depending on the value of BNO. If the address bit known as the 8th or 9th bit of the
received word is "0" with the address detect function being enabled, an interrupt will
not be generated and the received data will be discarded.
Bit 3WAKE: RX pin falling edge wake-up function enable control
0: RX pin wake-up function is disabled
1: RX pin wake-up function is enabled
This bit enables or disables the receiver wake-up function. If this bit is equal to "1"
and the device is in the IDLE0 or SLEEP mode, a falling edge on the RX input pin
will wake-up the device. If this bit is equal to "0" and the device is in the IDLE or
SLEEP mode, any edge transitions on the RX pin will not wake-up the device.
Bit 2RIE: Receiver interrupt enable control
0: Receiver related interrupt is disabled
1: Receiver related interrupt is enabled
This bit enables or disables the receiver interrupt. If this bit is equal to "1" and when
the receiver overrun flag OERR or receive data available flag RXIF is set, the UART
interrupt request flag will be set. If this bit is equal to "0", the UART interrupt request
flag will not be influenced by the condition of the OERR or RXIF flags.
Bit 1TIIE: Transmitter Idle interrupt enable control
0: Transmitter idle interrupt is disabled
1: Transmitter idle interrupt is enabled
This bit enables or disables the transmitter idle interrupt. If this bit is equal to "1" and
when the transmitter idle flag TIDLE is set, due to a transmitter idle condition, the
UART interrupt request flag will be set. If this bit is equal to "0", the UART interrupt
request flag will not be influenced by the condition of the TIDLE flag.
Bit 0TEIE: Transmitter Empty interrupt enable control
0: Transmitter empty interrupt is disabled
1: Transmitter empty interrupt is enabled
This bit enables or disables the transmitter empty interrupt. If this bit is equal to "1"
and when the transmitter empty flag TXIF is set, due to a transmitter empty condition,
the UART interrupt request flag will be set. If this bit is equal to "0", the UART
interrupt request flag will not be influenced by the condition of the TXIF flag.
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TXR_RXR register
The TXR_RXRn register is the data register which is used to store the data to be transmitted on the
TXn pin or being received from the RXn pin.
Bit
7
6
5
4
3
2
1
0
Name
TXRX7
TXRX6
TXRX5
TXRX4
TXRX3
TXRX2
TXRX1
TXRX0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
"x" unknown
Bit 7~0TXRX7~TXRX0: UART Transmit/Receive Data bit 7 ~ bit 0
Baud Rate Generator
To setup the speed of the serial data communication, the UART function contains its own dedicated
baud rate generator. The baud rate is controlled by its own internal free running 8-bit timer, the period
of which is determined by two factors. The first of these is the value placed in the baud rate register
BRG and the second is the value of the BRGH bit with the control register UCR2. The BRGH bit
decides if the baud rate generator is to be used in a high speed mode or low speed mode, which in
turn determines the formula that is used to calculate the baud rate. The value in the BRG register, N,
which is used in the following baud rate calculation formula determines the division factor. Note that
N is the decimal value placed in the BRG register and has a range of between 0 and 255.
UCR2 BRGH Bit
0
1
Baud Rate (BR)
fSYS / [64 (N+1)]
fSYS / [16 (N+1)]
By programming the BRGH bit which allows selection of the related formula and programming the
required value in the BRG register, the required baud rate can be setup. Note that because the actual
baud rate is determined using a discrete value, N, placed in the BRG register, there will be an error
associated between the actual and requested value. The following example shows how the BRG
register value N and the error value can be calculated.
BRG Register
Bit
7
6
5
4
3
2
1
0
Name
BRG7
BRG6
BRG5
BRG4
BRG3
BRG2
BRG1
BRG0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
x
x
x
x
x
x
x
x
"x" unknown
Bit 7~0BRG7~BRG0: Baud Rate values
By programming the BRGH bit in UCR2 Register which allows selection of the
related formula described above and programming the required value in the BRG
register, the required baud rate can be setup.
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Calculating the Baud Rate and Error Values
For a clock frequency of 4MHz, and with BRGH set to "0" determine the BRG register value N, the
actual baud rate and the error value for a desired baud rate of 4800.
From the above table the desired baud rate BR = fSYS / [64 (N+1)]
Re-arranging this equation gives N = [fSYS / (BR×64)] - 1
Giving a value for N = [4000000 / (4800×64)] - 1 = 12.0208
To obtain the closest value, a decimal value of 12 should be placed into the BRG register. This gives
an actual or calculated baud rate value of BR = 4000000 / [64× (12 + 1)] = 4808
Therefore the error is equal to (4808 - 4800) / 4800 = 0.16%
The following table shows actual values of baud rate and error values for the two values of BRGH.
Baud Rate
K/BPS
fSYS=8MHz
Baud Rates for BRGH=0
BRG
Kbaud
Baud Rates for BRGH=1
Error (%)
BRG
Kbaud
Error (%)
0.3
—
—
—
—
—
—
1.2
103
1.202
0.16
—
—
—
2.4
51
2.404
0.16
207
2.404
0.16
4.8
25
4.808
0.16
103
4.808
0.16
9.6
12
9.615
0.16
51
9.615
0.16
19.2
6
17.8857
-6.99
25
19.231
0.16
38.4
2
41.667
8.51
12
38.462
0.16
57.6
1
62.500
8.51
8
55.556
-3.55
115.2
0
125
8.51
3
125
8.51
250
—
—
—
1
250
0
Baud Rates and Error Values
UART Setup and Control
For data transfer, the UART function utilizes a non-return-to-zero, more commonly known as NRZ,
format. This is composed of one start bit, eight or nine data bits, and one or two stop bits. Parity
is supported by the UART hardware, and can be setup to be even, odd or no parity. For the most
common data format, 8 data bits along with no parity and one stop bit, denoted as 8, N, 1, is used
as the default setting, which is the setting at power-on. The number of data bits and stop bits, along
with the parity, are setup by programming the corresponding BNO, PRT, PREN, and STOPS bits
in the UCR1 register. The baud rate used to transmit and receive data is setup using the internal
8-bit baud rate generator, while the data is transmitted and received LSB first. Although the UART
transmitter and receiver are functionally independent, they both use the same data format and baud
rate. In all cases stop bits will be used for data transmission.
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Enabling/Disabling the UART Interface
The basic on/off function of the internal UART function is controlled using the UARTEN bit in the
UCR1 register. If the UARTEN, TXEN and RXEN bits are set, then these two UART pins will act
as normal TX output pin and RX input pin respectively. If no data is being transmitted on the TX
pin, then it will default to a logic high value.
Clearing the UARTEN bit will disable the TX and RX pins and allow these two pins to be used as
normal I/O or other pin-shared functional pins. When the UART function is disabled the buffer will
be reset to an empty condition, at the same time discarding any remaining residual data. Disabling
the UART will also reset the error and status flags with bits TXEN, RXEN, TXBRK, RXIF, OERR,
FERR, PERR and NF being cleared while bits TIDLE, TXIF and RIDLE will be set. The remaining
control bits in the UCR1, UCR2 and BRG registers will remain unaffected. If the UARTEN bit in
the UCR1 register is cleared while the UART is active, then all pending transmissions and receptions
will be immediately suspended and the UART will be reset to a condition as defined above. If the
UART is then subsequently re-enabled, it will restart again in the same configuration.
Data, Parity and Stop Bit Selection
The format of the data to be transferred is composed of various factors such as data bit length,
parity on/off, parity type, address bits and the number of stop bits. These factors are determined by
the setup of various bits within the UCR1 register. The BNO bit controls the number of data bits
which can be set to either 8 or 9, the PRT bit controls the choice of odd or even parity, the PREN
bit controls the parity on/off function and the STOPS bit decides whether one or two stop bits are to
be used. The following table shows various formats for data transmission. The address bit identifies
the frame as an address character. The number of stop bits, which can be either one or two, is
independent of the data length and are only to be used for Transmitter. There is only one stop bit for
Receiver.
Start Bit
Data Bits
Address Bits
Parity Bits
Stop Bit
Example of 8-bit Data Formats
1
8
0
0
1
1
7
0
1
1
1
7
1
0
1
Example of 9-bit Data Formats
1
9
0
0
1
1
8
0
1
1
1
8
1
0
1
Transmitter Receiver Data Format
The following diagram shows the transmit and receive waveforms for both 8-bit and 9-bit data
formats.
8-Bit Data Format
9-Bit Data Format
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UART Transmitter
Data word lengths of either 8 or 9 bits can be selected by programming the BNO bit in the UCR1
register. When BNO bit is set, the word length will be set to 9 bits. In this case the 9th bit, which
is the MSB, needs to be stored in the TX8 bit in the UCR1 register. At the transmitter core lies the
Transmitter Shift Register, more commonly known as the TSR, whose data is obtained from the
transmit data register, which is known as the TXR register. The data to be transmitted is loaded
into this TXR register by the application program. The TSR register is not written to with new data
until the stop bit from the previous transmission has been sent out. As soon as this stop bit has been
transmitted, the TSR can then be loaded with new data from the TXR register, if it is available. It
should be noted that the TSR register, unlike many other registers, is not directly mapped into the
Data Memory area and as such is not available to the application program for direct read/write
operations. An actual transmission of data will normally be enabled when the TXEN bit is set, but
the data will not be transmitted until the TXR register has been loaded with data and the baud rate
generator has defined a shift clock source. However, the transmission can also be initiated by first
loading data into the TXR register, after which the TXEN bit can be set. When a transmission of
data begins, the TSR is normally empty, in which case a transfer to the TXR register will result in
an immediate transfer to the TSR. If during a transmission the TXEN bit is cleared, the transmission
will immediately cease and the transmitter will be reset. The TX output pin will then return to the I/
O or other pin-shared function.
Transmitting Data
When the UART is transmitting data, the data is shifted on the TX pin from the shift register, with
the least significant bit first. In the transmit mode, the TXR register forms a buffer between the
internal bus and the transmitter shift register. It should be noted that if 9-bit data format has been
selected, then the MSB will be taken from the TX8 bit in the UCR1 register. The steps to initiate a
data transfer can be summarized as follows:
• Make the correct selection of the BNO, PRT, PREN and STOPS bits to define the required word
length, parity type and number of stop bits.
• Setup the BRG register to select the desired baud rate.
• Set the TXEN bit to ensure that the UART transmitter is enabled and the TX pin is used as a
UART transmitter pin.
• Access the USR register and write the data that is to be transmitted into the TXR register. Note
that this step will clear the TXIF bit.
This sequence of events can now be repeated to send additional data. It should be noted that when
TXIF is "0", data will be inhibited from being written to the TXR register. Clearing the TXIF flag is
always achieved using the following software sequence:
• A USR register access
• A TXR register write execution
The read-only TXIF flag is set by the UART hardware and if set indicates that the TXR register is
empty and that other data can now be written into the TXR register without overwriting the previous
data. If the TEIE bit is set then the TXIF flag will generate an interrupt. During a data transmission,
a write instruction to the TXR register will place the data into the TXR register, which will be
copied to the shift register at the end of the present transmission. When there is no data transmission
in progress, a write instruction to the TXR register will place the data directly into the shift register,
resulting in the commencement of data transmission, and the TXIF bit being immediately set. When
a frame transmission is complete, which happens after stop bits are sent or after the break frame, the
TIDLE bit will be set. To clear the TIDLE bit the following software sequence is used:
• A USR register access
• A TXR register write execution
Note that both the TXIF and TIDLE bits are cleared by the same software sequence.
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Transmit Break
If the TXBRK bit is set then break characters will be sent on the next transmission. Break character
transmission consists of a start bit, followed by 13×N ‘0’ bits and stop bits, where N=1, 2, etc. If a
break character is to be transmitted then the TXBRK bit must be first set by the application program
and then cleared to generate the stop bits. Transmitting a break character will not generate a transmit
interrupt. Note that a break condition length is at least 13 bits long. If the TXBRK bit is continually
kept at a logic high level then the transmitter circuitry will transmit continuous break characters.
After the application program has cleared the TXBRK bit, the transmitter will finish transmitting the
last break character and subsequently send out one or two stop bits. The automatic logic highs at the
end of the last break character will ensure that the start bit of the next frame is recognized.
UART Receiver
The UART is capable of receiving word lengths of either 8 or 9 bits can be selected by programming
the BNO bit in the UCR register. If the BNO bit is set, the word length will be set to 9 bits with the
MSB being stored in the RX8 bit of the UCR1 register. At the receiver core lies the Receive Serial
Shift Register, commonly known as the RSR. The data which is received on the RX external input
pin is sent to the data recovery block. The data recovery block operating speed is 16 times that of the
baud rate, while the main receive serial shifter operates at the baud rate. After the RX pin is sampled
for the stop bit, the received data in RSR is transferred to the receive data register, if the register is
empty. The data which is received on the external RX input pin is sampled three times by a majority
detect circuit to determine the logic level that has been placed onto the RX pin. It should be noted
that the RSR register, unlike many other registers, is not directly mapped into the Data Memory area
and as such is not available to the application program for direct read/write operations.
Receiving Data
When the UART receiver is receiving data, the data is serially shifted in on the external RX input pin
to the shift register, with the least significant bit LSB first. The RXR register is a two byte deep FIFO
data buffer, where two bytes can be held in the FIFO while a third byte can continue to be received.
Note that the application program must ensure that the data is read from RXR before the third byte
has been completely shifted in, otherwise this third byte will be discarded and an overrun error OERR
will be subsequently indicated. The steps to initiate a data transfer can be summarized as follows:
• Make the correct selection of BNO, PRT and PREN bits to define the word length and parity type.
• Setup the BRG register to select the desired baud rate.
• Set the RXEN bit to ensure that the UART receiver is enabled and the RX pin is used as a UART
receiver pin.
At this point the receiver will be enabled which will begin to look for a start bit.
When a character is received, the following sequence of events will occur:
• The RXIF bit in the USR register will be set when RXR register has data available, at least one
character can be read.
• When the contents of the shift register have been transferred to the RXR register and if the RIE
bit is set, then an interrupt will be generated.
• If during reception, a frame error, noise error, parity error, or an overrun error has been detected,
then the error flags can be set.
• The RXIF bit can be cleared using the following software sequence:
• A USR register access
• An RXR register read execution
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Touch 8-Bit Flash MCU with LED/LCD Driver
Receive Break
Any break character received by the UART will be managed as a framing error. The receiver will
count and expect a certain number of bit times as specified by the values programmed into the BNO
and one STOPS bit. If the break is much longer than 13 bit times, the reception will be considered
as complete after the number of bit times specified by BNO and one STOP bit. The RXIF bit is set,
FERR is set, zeros are loaded into the receive data register, interrupts are generated if appropriate
and the RIDLE bit is set. If a long break signal has been detected and the receiver has received a
start bit, the data bits and the invalid stop bit, which sets the FERR flag, the receiver must wait for a
valid stop bit before looking for the next start bit. The receiver will not make the assumption that the
break condition on the line is the next start bit. A break is regarded as a character that contains only
zeros with the FERR flag set. The break character will be loaded into the buffer and no further data
will be received until stop bits are received. It should be noted that the RIDLE read only flag will go
high when the stop bits have not yet been received. The reception of a break character on the UART
registers will result in the following:
• The framing error flag, FERR, will be set.
• The receive data register, RXR, will be cleared.
• The OERR, NF, PERR, RIDLE or RXIF flags will possibly be set.
Idle Status
When the receiver is reading data, which means it will be in between the detection of a start bit and
the reading of a stop bit, the receiver status flag in the USR register, otherwise known as the RIDLE
flag, will have a zero value. In between the reception of a stop bit and the detection of the next start
bit, the RIDLE flag will have a high value, which indicates the receiver is in an idle condition.
Receiver Interrupt
The read only receive interrupt flag RXIF in the USR register is set by an edge generated by the
receiver. An interrupt is generated if RIE bit is "1", when a word is transferred from the Receive
Shift Register, RSR, to the Receive Data Register, RXR. An overrun error can also generate an
interrupt if RIE is "1".
Managing Receiver Errors
Several types of reception errors can occur within the UART module, the following section describes
the various types and how they are managed by the UART.
Overrun Error – OERR flag
The RXR register is composed of a two byte deep FIFO data buffer, where two bytes can be held
in the FIFO register, while a third byte can continue to be received. Before this third byte has been
entirely shifted in, the data should be read from the RXR register. If this is not done, the overrun
error flag OERR will be consequently indicated.
In the event of an overrun error occurring, the following will happen:
• The OERR flag in the USR register will be set.
• The RXR contents will not be lost.
• The shift register will be overwritten.
• An interrupt will be generated if the RIE bit is set.
The OERR flag can be cleared by an access to the USR register followed by a read to the RXR
register.
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Noise Error – NF Flag
Over-sampling is used for data recovery to identify valid incoming data and noise. If noise is
detected within a frame the following will occur:
• The read only noise flag, NF, in the USR register will be set on the rising edge of the RXIF bit.
• Data will be transferred from the Shift register to the RXR register.
• No interrupt will be generated. However this bit rises at the same time as the RXIF bit which
itself generates an interrupt.
Note that the NF flag is reset by a USR register read operation followed by an RXR register read
operation.
Framing Error – FERR Flag
The read only framing error flag, FERR, in the USR register, is set if a zero is detected instead of
stop bits. If two stop bits are selected, only the first stop bit is detected, it must be high. If the first
stop bit is low, the FERR flag will be set. The FERR flag is buffered along with the received data
and is cleared on any reset.
Parity Error – PERR Flag
The read only parity error flag, PERR, in the USR register, is set if the parity of the received word is
incorrect. This error flag is only applicable if the parity is enabled, PREN bit is "1", and if the parity
type, odd or even is selected. The read only PERR flag is buffered along with the received data
bytes. It is cleared on any reset. It should be noted that the FERR and PERR flags are buffered along
with the corresponding word and should be read before reading the data word.
UART Module Interrupt Structure
Several individual UART conditions can generate a UART interrupt. When these conditions exist,
a low pulse will be generated to get the attention of the microcontroller. These conditions are a
transmitter data register empty, transmitter idle, receiver data available, receiver overrun, address
detect and an RX pin wake-up. When any of these conditions are created, if its corresponding
interrupt control is enabled and the stack is not full, the program will jump to its corresponding
interrupt vector where it can be serviced before returning to the main program. Four of these
conditions have the corresponding USR register flags which will generate a UART interrupt if its
associated interrupt enable control bit in the UCR2 register is set. The two transmitter interrupt
conditions have their own corresponding enable control bits, while the two receiver interrupt
conditions have a shared enable control bit. These enable bits can be used to mask out individual
UART interrupt sources.
The address detect condition, which is also a UART interrupt source, does not have an associated
flag, but will generate a UART interrupt when an address detect condition occurs if its function
is enabled by setting the ADDEN bit in the UCR2 register. An RX pin wake-up, which is also a
UART interrupt source, does not have an associated flag, but will generate a UART interrupt if the
microcontroller is woken up from IDLE0 or SLEEP mode by a falling edge on the RX pin, if the
WAKE and RIE bits in the UCR2 register are set. Note that in the event of an RX wake-up interrupt
occurring, there will be a certain period of delay, commonly known as the System Start-up Time, for
the oscillator to restart and stabilize before the system resumes normal operation.
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Note that the USR register flags are read only and cannot be cleared or set by the application
program, neither will they be cleared when the program jumps to the corresponding interrupt
servicing routine, as is the case for some of the other interrupts. The flags will be cleared
automatically when certain actions are taken by the UART, the details of which are given in the
UART register section. The overall UART interrupt can be disabled or enabled by the related
interrupt enable control bits in the interrupt control registers of the microcontroller to decide whether
the interrupt requested by the UART module is masked out or allowed.
USR Register
UCR2 Register
Transmitter Empty
Flag TXIF
TEIE
Transmitter Idle
Flag TIDLE
TIIE
0
1
RIE
0
1
Receiver Overrun
Flag OERR
OR
Receiver Data
Available RXIF
RX Pin
Wake-up
ADDEN
WAKE
0
1
UART Interrupt
Request Flag
UARTF
INTC0
Register
INTC2
Register
EMI
UARTE
0
1
0
1
0
1
RX7 if BNO=0
RX8 if BNO=1
UCR2 Register
UART Interrupt Scheme
Address Detect Mode
Setting the Address Detect Mode bit, ADDEN, in the UCR2 register, enables this special mode.
If this bit is enabled then an additional qualifier will be placed on the generation of a Receiver
Data Available interrupt, which is requested by the RXIF flag. If the ADDEN bit is "1", then when
data is available, an interrupt will only be generated, if the highest received bit has a high value.
Note that the related interrupt enable control bit and the EMI bit must also be enabled for correct
interrupt generation. This highest address bit is the 9th bit if BNO bit is "1" or the 8th bit if BNO
bit is "0". If this bit is high, then the received word will be defined as an address rather than data. A
Data Available interrupt will be generated every time the last bit of the received word is set. If the
ADDEN bit is "0", then a Receiver Data Available interrupt will be generated each time the RXIF
flag is set, irrespective of the data last bit status. The address detect mode and parity enable are
mutually exclusive functions. Therefore if the address detect mode is enabled, then to ensure correct
operation, the parity function should be disabled by resetting the parity enable bit PREN to zero.
ADDEN
0
1
Bit 9 if BNO=1, Bit 8 if BNO=0
UART Interrupt Generated
0
√
1
√
0
×
1
√
ADDEN Bit Function
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UART Power Down and Wake-up
When the the device system clock is switched off, the UART will cease to function. If the device
executes the "HALT" instruction and switches off the system clock while a transmission is still
in progress, then the transmission will be paused until the UART clock source derived from the
microcontroller is activated. In a similar way, if the device executes the "HALT" instruction and
switches off the system clock while receiving data, then the reception of data will likewise be
paused. When the device enters the IDLE or SLEEP Mode, note that the USR, UCR1, UCR2,
transmit and receive registers, as well as the BRG register will not be affected. It is recommended
to make sure first that the UART data transmission or reception has been finished before the
microcontroller enters the IDLE or SLEEP mode.
The UART function contains a receiver RX pin wake-up function, which is enabled or disabled
by the WAKE bit in the UCR2 register. If this bit, along with the UART enable bit, UARTEN, the
receiver enable bit, RXEN and the receiver interrupt bit, RIE, are all set before the device enters the
IDLE0 or SLEEP Mode, then a falling edge on the RX pin will wake up the device from the IDLE0
or SLEEP Mode. Note that as it takes certain system clock cycles after a wake-up, before normal
microcontroller operation resumes, any data received during this time on the RX pin will be ignored.
For a UART wake-up interrupt to occur, in addition to the bits for the wake-up being set, the global
interrupt enable bit, EMI, and the UART interrupt enable bit, UARTE, must also be set. If these two
bits are not set then only a wake up event will occur and no interrupt will be generated. Note also
that as it takes certain system clock cycles after a wake-up before normal microcontroller resumes,
the UART interrupt will not be generated until after this time has elapsed.
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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 Touch Action or Timer/Event Counter overflow 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 interrupt and internal interrupt functions. The external interrupt is generated by the action of
the external INT pin and Touch Keys, while the internal interrupts are generated by various internal
functions such as Timer Modules, Time Bases, I2C, LVD, EEPROM and UART.
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 registers fall into two categories. The first is the INTC0~INTC3 registers
which setup the primary interrupts, the second is the 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
—
Touch Key Module
TKME
TKMF
—
IC
IICE
IICF
—
UART
UARTE
UARTF
—
EEPROM
DEE
DEF
—
LVD
LVDE
LVDF
—
Time Base
TBnE
TBnF
n=0 or 1
CTMPnE
CTMPnF
n=0
PTMPnE
PTMPnF
n=0
CTMAnE
CTMAnF
n=0
PTMAnE
PTMAnF
n=0
2
TM
Interrupt Register Bit Naming Conventions
Interrupt Register Contents
Rev. 1.40
Name
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
INTEG
—
—
—
—
—
—
INTS1
INTS0
TKME
INTE
EMI
INTC0
—
TB0F
TKMF
INTF
TB0E
INTC1
PTMA0F
PTMP0F
CTMA0F
CTMP0F
PTMA0E
INTC2
UARTF
DEF
IICF
TB1F
UARTE
DEE
IICE
TB1E
INTC3
—
—
—
LVDF
—
—
—
LVDE
134
PTMP0E CTMA0E CTMP0E
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
INTEG Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
INTS1
INTS0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
0
Bit 7 ~ 2 Unimplemented, read as "0"
Bit 1 ~ 0
INTS1, INTS0: Defines INT interrupt active edge
00: Disabled interrupt
01: Rising Edge interrupt
10: Falling Edge interrupt
11: Dual Edge interrupt
INTC0 Register
Bit
7
6
5
4
3
2
1
Name
—
TB0F
TKMF
INTF
TB0E
TKME
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
2
1
0
Bit 7
Unimplemented, read as "0"
Bit 6
TB0F: Time Base 0 interrupt request flag
0: No request
1: Interrupt request
Bit 5
TKMF: Touch key module interrupt request flag
0: No request
1: Interrupt request
Bit 4
INTF: INT pin interrupt request flag
0: No request
1: Interrupt request
Bit 3 TB0E: Time Base 0 interrupt control
0: Disable
1: Enable
Bit 2
TKME: Touch key module interrupt control
0: Disable
1: Enable
Bit 1
INTE: INT pin interrupt control
0: Disable
1: Enable
Bit 0EMI: Global Interrupt control
0: Disable
1: Enable
INTC1 Register
Rev. 1.40
Bit
7
6
5
4
3
Name
PTMA0F
PTMP0F
CTMA0F
CTMP0F
PTMA0E
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
PTMP0E CTMA0E CTMP0E
Bit 7
PTMA0F: PTM0 CCRA comparator interrupt request flag
0: No request
1: Interrupt request
Bit 6
PTMP0F: PTM0 CCRP comparator interrupt request flag
0: No request
1: Interrupt request
135
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 5
CTMA0F: CTM0 CCRA comparator interrupt request flag
0: No request
1: Interrupt request
Bit 4
CTMP0F: CTM0 CCRP comparator interrupt request flag
0: No request
1: Interrupt request
Bit 3PTMA0E: PTM0 CCRA comparator interrupt control
0: Disable
1: Enable
Bit 2PTMP0E: PTM0 CCRP comparator interrupt control
0: Disable
1: Enable
Bit 1CTMA0E: CTM0 CCRA comparator interrupt control
0: Disable
1: Enable
Bit 0CTMP0E: CTM0 CCRP comparator interrupt control
0: Disable
1: Enable
INTC2 Register
Bit
7
6
5
4
3
2
1
0
Name
UARTF
DEF
IICF
TB1F
UARTE
DEE
IICE
TB1E
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
UARTF: UART interrupt request flag
0: No request
1: Interrupt request
Bit 6
DEF: Data EEPROM interrupt request flag
0: No request
1: Interrupt request
Bit 5
IICF: I2C interrupt request flag
0: No request
1: Interrupt request
Bit 4
TB1F: Time Base 1 interrupt request flag
0: No request
1: Interrupt request
Bit 3 UARTE: UART interrupt request control
0: Disable
1: Enable
Rev. 1.40
Bit 2
DEE: Data EEPROM control
0: Disable
1: Enable
Bit 1
IICE: I2C interrupt control
0: Disable
1: Enable
Bit 0
TB1E: Time Base 1 interrupt control
0: Disable
1: Enable
136
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
INTC3 Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
LVDF
—
—
—
LVDE
R/W
—
—
—
R/W
—
—
—
R/W
POR
—
—
—
0
—
—
—
0
Bit 7~5 Unimplemented, read as "0"
Bit 4
LVDF: LVD interrupt request flag
0: No request
1: Interrupt request
Bit 3~1
Unimplemented, read as "0"
Bit 0
LVDE: LVD interrupt control
0: Disable
1: Enable
Interrupt Operation
When the conditions for an interrupt event occur, such as a Touch Key Counter overflow, a TM
Comparator P or Comparator A match, 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.
The various interrupt enable bits, together with their associated request flags, are shown in the
accompanying diagrams with their order of priority. Every interrupt source has its own individual
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.
Rev. 1.40
137
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
E�I auto disabled in ISR
Legend
xxF
Request Flag� auto reset in ISR
xxE
Enable Bits
Interrupt
Name
Request
Flags
Enable
Bits
�aster
Enable
Vector
INT Pin
INTF
INTE
E�I
04H
Touch Ke� �odule
TK�F
TK�E
E�I
08H
Time Base 0
TB0F
TB0E
E�I
0CH
CT�0 P
CT�P0F
CT�P0E
E�I
10H
CT�0 A
CT�A0F
CT�A0E
E�I
14H
PT�0 P
PT�P0F
PT�P0E
E�I
18H
PT�0 A
PT�A0F
PT�A0E
E�I
1CH
Time Base 1
TB1F
TB1E
E�I
�0H
I�C
IICF
IICE
E�I
�4H
EEPRO�
DEF
DEE
E�I
�8H
UART
UARTF
UARTE
E�I
�CH
LVD
LVDF
LVDE
E�I
30H
Priorit�
High
Low
Interrupt Structure
External Interrupt
The external interrupt is controlled by signal transitions on the pin INT. An external interrupt
request will take place when the external interrupt request flag, INTF, 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 its respective interrupt vector address, the global interrupt
enable bit, EMI, and respective external interrupt enable bit, INTE, 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 pin is pin-shared
with I/O pin, it can only be configured as external interrupt pin if its external interrupt enable bit in
the corresponding interrupt register has been set. 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,
INTF, will be automatically reset and the EMI bit will be automatically cleared to disable other
interrupts. Note that any pull-high resistor selections 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.
Rev. 1.40
138
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Time Base Interrupts
The function of the Time Base Interrupt is to provide regular time signal in the form of an internal
interrupt. It is controlled by the overflow signal from its timer function. When this happens its
interrupt request flags TBnF will be set. To allow the program to branch to its interrupt vector
address, the global interrupt enable bit, EMI and Time Base enable bit, TBnE, must first be set.
When the interrupt is enabled, the stack is not full and the Time Base overflows, a subroutine call to
its vector location will take place. When the interrupt is serviced, the interrupt request flag, TBnF,
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. Each
Time Base clock source originates from an independent internal prescaler.
Each 15-bit prescaler can source from fSYS, fSYS/4, fSUB or fH, selected by CLKSELn1~CLKSELn0
bits in the PSCR register.
PSCR Register
Bit
7
6
Name
—
—
R/W
—
—
R/W
POR
—
—
0
Bit 7~6
5
4
3
2
1
0
—
—
CLKSEL01
CLKSEL00
R/W
—
—
R/W
R/W
0
—
—
0
0
CLKSEL11 CLKSEL10
Unimplemented, read as "0"
Bit 5~4CLKSEL11 ~ CLKSEL10: Time Base 1 prescaler clock source selection
00: fSYS
01: fSYS/4
10: fSUB
11: fH
Bit 3~2
Unimplemented, read as "0"
Bit 1~0CLKSEL01 ~ CLKSEL00: Time Base 0 prescaler clock source selection
00: fSYS
01: fSYS/4
10: fSUB
11: fH
TBC Register
Bit
7
6
5
4
3
2
1
0
Name
TB1ON
TB12
TB11
TB10
TB0ON
TB02
TB01
TB00
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 7TB1ON: Time Base 1 enable/disable control
0: Disable
1: Enable
Bit 6~4
Rev. 1.40
TB12 ~ TB10: Select Time Base 1 Time-out Period
000: 28/fPSC
001: 29/fPSC
010: 210/fPSC
011: 211/fPSC
100: 212/fPSC
101: 213/fPSC
110: 214/fPSC
111: 215/fPSC
139
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Bit 3
TB0ON: Time Base 0 enable/disable control
0: Disable
1: Enable
Bit 2~0
TB02 ~ TB00: Select Time Base 1 Time-out Period
000: 28/fPSC
001: 29/fPSC
010: 210/fPSC
011: 211/fPSC
100: 212/fPSC
101: 213/fPSC
110: 214/fPSC
111: 215/fPSC
fSUB
fSYS
Prescaler
fSYS/4
fPSC
TimeBasenInterrupt
fH
CLKSELn[1:0]
TBnON
TBn[2:0]
Time Base Structure (n=0 or 1)
TM Interrupts
The Compact and Periodic type TMs each has two internal interrupts, the internal comparator A or
comparator P, which generates a TM interrupt when a compare match condition occurs. For each
of the Compact and Periodic Type TMs, there are two interrupt request flags, CTMP0F/CTMA0F
and PTMP0F/PTMA0F, and two enable bits, CTMP0E/CTMA0E and PTMP0E/PTMA0E. 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 A macth situation happens. To allow the program to branch to its
respective interrupt vector address, the global interrupt enable bit, EMI, the respective TM interrupt
enable bit 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 location, will take place.
When the TM interrupt is serviced, the TM interrupt request flag will be automatically reset and the
EMI bit will be automatically cleared to disable other interrupts.
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 DEF flag will be automatically cleared and the EMI bit will be
automatically cleared to disable other interrupts.
Rev. 1.40
140
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
LVD Interrupt
An LVD Interrupt request will take place when the LVD Interrupt request flag, LVDF, is set, which
occurs when the Low Voltage Detector function detects a low power supply voltage. To allow the
program to branch to its respective interrupt vector address, the global interrupt enable bit, EMI, and
Low Voltage Interrupt enable bit, LVDE, must first be set. When the interrupt is enabled, the stack is
not full and a low voltage condition occurs, a subroutine call to the LVD Interrupt vector, will take
place. When the Low Voltage Interrupt is serviced, the LVDF flag will be automatically cleared and
the EMI bit will be automatically cleared to disable other interrupts.
Touch Key Interrupt
For a Touch Key interrupt to occur, the global interrupt enable bit, EMI, and the Touch Key interrupt
enable TKME must be first set. An actual Touch Key interrupt will take place when the Touch Key
request flag. TKMF, is set, a situation that will occur when the time slot counter overflows. When
the interrupt is enabled, the stack is not full and the Touch Key time slot counter overflow occurs, a
subroutine call to the relevant timer interrupt vector, will take place. When the interrupt is serviced,
the Touch Key interrupt request flag, TKMF, will be automatically reset and the EMI bit will be
automatically cleared to disable other interrupts.
I2C Interrupt
An I2C Interrupt request will take place when the I2C Interrupt request flag, IICF, is set, which occurs
when an address match occurs, or an I2C communication time-out occurs, or a byte of data has
been received or transmitted by the I2C interface. To allow the program to branch to its respective
interrupt vector address, the global interrupt enable bit, EMI, and the I2C Interface Interrupt
enable bit, IICE, must first be set. When the interrupt is enabled, the stack is not full and any these
conditions are created, a subroutine call to the respective interrupt vector, will take place. When the
I2C Interface Interrupt is serviced, the I2C interrupt request flag, IICF, will be automatically cleared
and the EMI bit will be automatically cleared to disable other interrupts.
UART Interrupt
Several individual UART conditions can generate a UART interrupt. When these conditions exist,
a low pulse will be generated to get the attention of the microcontroller. These conditions are a
transmitter data register empty, transmitter idle, receiver data available, receiver overrun, address
detect and an RX pin wake-up. To allow the program to branch to the respective interrupt vector
addresses, the global interrupt enable bit, EMI, and UART interrupt enable bit, UARTE, must first
be set. When the interrupt is enabled, the stack is not full and any of these conditions are created,
a subroutine call to the UART Interrupt vector will take place. When the interrupt is serviced, the
UART Interrupt flag, UARTF, will be automatically cleared. The EMI bit will also be automatically
cleared to disable other interrupts. However, the USR register flags will be cleared automatically
when certain actions are taken by the UART, the details of which are given in the UART section.
Rev. 1.40
141
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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 or a low power supply voltage 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.
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.
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.
Rev. 1.40
142
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
SCOM and SSEG Function for LCD
The devices have the capability of driving external LCD panels. The common pins for LCD driving,
SCOM0~SCOM3, SSEG0~SSEG19, are pin shared with certain pins on the I/O ports. The LCD
signals (COM and SEG) are generated using the application program.
LCD Operation
An external LCD panel can be driven using the devices by configuring the I/O pins as common pins
and configuring the I/O pins as segment pins. The LCD driver function is controlled using the LCD
control registers which in addition to controlling the overall on/off function also controls the SCOM
and SSEG operating current. This enables the LCD COM and SEG driver to generate the necessary
VSS, (1/3)VDD, (2/3)VDD voltage and VDD levels for LCD 1/3 bias operation.
The LCDEN bit in the SLCDC0 register is the overall master control for the LCD driver, however
this bit is used in conjunction with the COMnEN and SEGnEN bits to select which I/O Port pins
are used for LCD driving. Note that the Port Control register does not need to first setup the pins as
outputs to enable the LCD driver operation.
LCD Driver Structure
Rev. 1.40
143
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
The accompanying waveform diagram shows a typical 1/3 Bias LCD waveform generated using the
application program. Note that the depiction of a "1" in the diagram illustrates an illuminated LCD
pixel. The COM signal polarity generated on pins SCOM0~SCOM3, whether 0 or 1, are generated
using the corresponding I/O data register bits, which are bits PA0~PA2, PA4 in the PA register.
Note: The logical values shown in the diagram are the PA I/O register bit values, PA0~PA2, PA4.
1/3 Bias LCD Waveform
Rev. 1.40
144
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
A cyclic LCD waveform includes two frames, known as Frame 0 and Frame 1 for which the
following offers a functional explanation.
In Frame 0
To select Frame 0 clear the FRAME bit to 0.
In frame 0, the COM signal output can have a value of VDD, or have a Vbias value of (1/3)VDD. The
SEG signal can have a value of VSS, or have a Vbias value of (2/3)VDD.
In Frame 1
In frame 1, the COM signal output can have a value of VSS, or have a Vbias value of (2/3)VDD. The
SEG signal can have a value of VDD have a Vbias value of (1/3)VDD.
The COM0~COMn waveform is controlled by the application program using the FRAME bit, and the
corresponding I/O data register for the respective COM pin to determine whether the COM0~COMn
output has a value of either VDD, VSS or Vbias. The SEG0~SEGm waveform is controlled in a similar
way using the FRAME bit and the corresponding I/O data register for the respective SEG pin to
determine whether the SEG0~SEGn output has a value of either VDD, VSS or Vbias.
LCD Bias Control
The LCD COM and SEG driver enable 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 SLCDC0 register.
SLCDC0 Register
Bit
7
6
5
4
Name
FRAME
ISEL1
ISEL0
LCDEN
3
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
COM3EN COM2EN COM1EN COM0EN
FRAME: Fram 0 or Frame 1 output selection
0: Frame 0
1: Frame 1
Bit 6~5ISEL1~ISEL0: SCOM and SSEG operating current selection (VDD=5V)
00: 8.3μA
01: 16.7μA
10: 50μA
11: 100μA
Bit 4LCDEN: SCOM and SSEG module on/off control
0: Disable
1: Enable
The SCOMn and SSEGm lines can be enabled using COMnEN and SEGmEN if
LCDEN=1. When LCDEN=0, then the SCOMn and SSEGm outputs will be fixed at a
VSS level.
Bit 3COM3EN: SCOM3 or other function selection
0: Other function
1: SCOM3
Bit 2COM2EN: SCOM2 or other function selection
0: Other function
1: SCOM2
Bit 1COM1EN: SCOM1 or other function selection
0: Other function
1: SCOM1
Bit 0COM0EN: SCOM0 or other function selection
0: Other function
1: SCOM0
Bit 7
Rev. 1.40
145
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
SLCDC1 Register
Bit
Name
7
6
5
4
3
2
1
0
SEG7EN SEG6EN SEG5EN SEG4EN SEG3EN SEG2EN SEG1EN SEG0EN
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 7~0SEG7EN~SEG0EN: SSEG7 ~ SSEG0 or other function selection
0: Other function
1: SSEG7~SSEG0
SLCDC2 Register
Bit
Name
7
6
5
4
3
2
1
0
SEG15EN SEG14EN SEG13EN SEG12EN SEG11EN SEG10EN SEG9EN SEG8EN
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 7~0SEG15EN~SEG8EN: SSEG15 ~ SSEG8 or other function selection
0: Other function
1: SSEG15~SSEG8
SLCDC3 Register – BS82C16A-3/BS82D20A-3
Bit
7
6
5
4
Name
—
—
—
—
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
0
0
0
Bit 7~4
3
2
1
0
SEG19EN SEG18EN SEG17EN SEG16EN
Unimplemented, read as "0"
Bit 3~0SEG19EN~SEG16EN: SSEG19 ~ SSEG16 or other function selection
0: Other function
1: SSEG19~SSEG16
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
Low Voltage Detector – LVD
Each device has a Low Voltage Detector function, also known as LVD. This enables the device to
monitor the power supply voltage, VDD, and provides a warning signal should it fall below a certain
level. This function may be especially useful in battery applications where the supply voltage will
gradually reduce as the battery ages, as it allows an early warning battery low signal to be generated.
The Low Voltage Detector also has the capability of generating an interrupt signal.
LVD Register
The Low Voltage Detector function is controlled using a single register with the name LVDC. Three
bits in this register, VLVD2~VLVD0, are used to select one of five fixed voltages below which a
low voltage condition will be detemined. A low voltage condition is indicated when the LVDO bit is
set. If the LVDO bit is low, this indicates that the VDD voltage is above the preset low voltage value.
The LVDEN bit is used to control the overall on/off function of the low voltage detector. Setting the
bit high will enable the low voltage detector. Clearing the bit to zero will switch off the internal low
voltage detector circuits. As the low voltage detector will consume a certain amount of power, it may
be desirable to switch off the circuit when not in use, an important consideration in power sensitive
battery powered applications.
LVDC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
LVDO
LVDEN
—
VLVD2
VLVD1
VLVD0
R/W
—
—
R
R/W
—
R/W
R/W
R/W
POR
—
—
0
0
—
0
0
0
Bit 7 ~ 6
Unimplemented, read as "0"
Bit 5LVDO: LVD Output Flag
0: No Low Voltage Detect
1: Low Voltage Detect
Bit 4LVDEN: Low Voltage Detector Control
0: Disable
1: Enable
Rev. 1.40
Bit 3
Unimplemented, read as "0"
Bit 2~0
VLVD2 ~ VLVD0: Select LVD Voltage
000: 2.0V
001: 2.2V
010: 2.4V
011: 2.7V
100: 3.0V
101: 3.3V
110: 3.6V
111: 4.0V
Note: The VLVR of these three devices is fixed at 2.55V, so the VLVD should be set to
2.7V~4.0V.
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Touch 8-Bit Flash MCU with LED/LCD Driver
LVD Operation
The Low Voltage Detector function operates by comparing the power supply voltage, VDD, with a
pre-specified voltage level stored in the LVDC register. This has a range of between 2.7V and 4.0V.
When the power supply voltage, VDD, falls below this pre-determined value, the LVDO bit will be
set high indicating a low power supply voltage condition. The Low Voltage Detector function is
supplied by a reference voltage which will be automatically enabled. When the device is in SLEEP
mode the low voltage detector will be automatically disabled even if the LVDEN bit is high. After
enabling the Low Voltage Detector, a time delay tLVDS should be allowed for the circuitry to stabilise
before reading the LVDO bit. Note also that as the VDD voltage may rise and fall rather slowly, at the
voltage nears that of VLVD, there may be multiple bit LVDO transitions.
LVD Operation
The Low Voltage Detector also has its own interrupt, providing an alternative means of low voltage
detection, in addition to polling the LVDO bit. The interrupt will only be generated after a delay
of tLVD after the LVDO bit has been set high by a low voltage condition. In this case, the LVDF
interrupt request flag will be set, causing an interrupt to be generated if VDD falls below the preset
LVD voltage. This will cause the device to wake-up from the SLEEP or IDLE Mode, however if the
Low Voltage Detector wake up function is not required then the LVDF flag should be first set high
before the device enters the SLEEP or IDLE Mode.
Rev. 1.40
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Touch 8-Bit Flash MCU with LED/LCD Driver
Configuration Options
Configuration options refer to certain options within the MCU that are programmed into the device
during the programming process. During the development process, these options are selected using
the HT-IDE software development tools. As these options are programmed into the device using
the hardware programming tools, once they are selected they cannot be changed later using the
application program. All options must be defined for proper system function, the details of which are
shown in the table.
No.
Options
Oscillator Option
1
Low Speed System Oscillator Selection – fSUB:
LIRC
LXT
2
HIRC frequency selection:
8MHz
12MHz
16MHz
Note: 1. The low speed system oscillator selection is only for the BS82C16A-3 and BS82D20A-3.
2. When the HIRC has been configurated at a frequency shown in this table, the HIRCS1 and
HIRCS0 bits is recommended to be setup to select the same frequency to keep the HIRC
frequency accuracy spedified in the A.C. characteristics.
Application Circuit
VDD
VDD
I/O Pins
0.1uF
I�C Pins
VSS
KEY1
UART Pins
SCO�&SSEG
Pins
KEY�
XT1
XT�
See Oscillator
Section
KEYn
Rev. 1.40
OSC
Circuit
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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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Touch 8-Bit Flash MCU with LED/LCD Driver
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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Touch 8-Bit Flash MCU with LED/LCD Driver
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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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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.
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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. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
158
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
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May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
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BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
161
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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. 1.40
162
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
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/Carton Information.
Additional supplementary information with regard to packaging is listed below. Click on the relevant
section to be transferred to the relevant website page.
• Package Information (include Outline Dimensions, Product Tape and Reel Specifications)
• The Operation Instruction of Packing Materials
• Carton information
Rev. 1.40
163
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
20-pin SOP (300mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.406 BSC
—
B
—
0.295 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. 1.40
Dimensions in mm
Min.
Nom.
Max.
A
—
10.30 BSC
—
B
—
7.50 BSC
—
C
0.31
—
0.51
C’
—
12.8 BSC
—
D
—
—
2.65
E
—
1.27 BSC
—
F
0.10
—
0.30
G
0.40
—
1.27
H
0.20
—
0.33
α
0°
—
8°
164
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
24-pin SOP(300mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.406 BSC
—
B
—
0.295 BSC
—
C
0.012
—
0.020
C’
—
0.606 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. 1.40
Dimensions in mm
Min.
Nom.
Max.
A
—
10.30 BSC
—
B
—
7.5 BSC
—
C
0.31
—
0.51
C’
—
15.4 BSC
—
D
—
—
2.65
E
—
1.27 BSC
—
F
0.10
—
0.30
G
0.40
—
1.27
H
0.20
—
0.33
α
0°
—
8°
165
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
SAW Type 24-pin (4mm×4mm) QFN Outline Dimensions
Symbol
Min.
Nom.
Max.
A
0.028
0.030
0.031
A1
0.000
0.001
0.002
A3
—
0.008 BSC
—
b
0.007
0.010
0.012
D
0.156
0.157
0.159
E
0.156
0.157
0.159
e
—
0.020 BSC
—
D2
0.102
0.106
0.110
E2
0.102
0.106
0.110
L
0.014
0.016
0.018
K
0.008
—
—
Symbol
Rev. 1.40
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
0.700
0.750
0.800
A1
0.000
0.020
0.050
A3
—
0.200 BSC
—
b
0.180
0.250
0.300
D
3.950
4.000
4.050
E
3.950
4.000
4.050
e
—
0.500 BSC
—
D2
2.600
2.700
2.800
E2
2.600
2.700
2.800
L
0.350
0.400
0.450
K
0.200
—
—
166
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
28-pin SOP (300mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
—
0.406 BSC
—
B
—
0.295 BSC
—
C
0.012
—
0.020
C’
—
0.705 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. 1.40
Dimensions in mm
Min.
Nom.
Max.
—
A
—
10.30 BSC
B
—
7.5 BSC
—
C
0.31
—
0.51
C’
—
17.9 BSC
—
D
—
—
2.65
E
—
1.27 BSC
—
F
0.10
—
0.30
G
0.40
—
1.27
H
0.20
—
0.33
α
0°
—
8°
167
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
28-pin SSOP (150mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
—
A
—
0.236 BSC
B
—
0.154 BSC
—
C
0.008
—
0.012
C’
—
0.390 BSC
—
D
—
—
0.069
E
—
0.025 BSC
—
F
0.004
—
0.010
G
0.016
—
0.050
H
0.004
—
0.010
α
0°
—
8°
Symbol
Rev. 1.40
Dimensions in mm
Min.
Nom.
Max.
—
A
—
6.0 BSC
B
—
3.9 BSC
—
C
0.20
—
0.30
C’
—
9.9 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°
168
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
SAW Type 32-pin (5mm×5mm) QFN Outline Dimensions
Symbol
Min.
Nom.
Max.
A
0.028
0.030
0.031
A1
0.000
0.001
0.002
A3
—
0.008 BSC
—
b
0.007
0.010
0.012
D
0.193
0.197
0.201
E
0.193
0.197
0.201
e
—
0.020 BSC
—
D2
0.122
0.126
0.130
E2
0.122
0.126
0.130
L
0.014
0.016
0.018
K
0.008
—
—
Symbol
Rev. 1.40
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
0.700
0.750
0.800
A1
0.000
0.020
0.050
A3
—
0.203 BSC
—
b
0.180
0.250
0.300
D
4.900
5.000
5.100
E
4.900
5.000
5.100
e
—
0.50 BSC
—
D2
3.10
3.20
3.30
E2
3.10
3.20
3.30
L
0.35
0.40
0.45
K
0.20
—
—
169
May 05, 2016
BS82B12A-3/BS82C16A-3/BS82D20A-3
Touch 8-Bit Flash MCU with LED/LCD Driver
Copyright© 2016 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. 1.40
170
May 05, 2016

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