BS83A04A-3/BS83A04A-4 - Holtek Semiconductor Inc.

Touch I/O 8-Bit Flash MCU
BS83A04A-3/BS83A04A-4
Revision: V1.10
Date: �������������
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Table of Contents
Features............................................................................................................. 5
CPU Features.......................................................................................................................... 5
Peripheral Features.................................................................................................................. 5
General Description ......................................................................................... 6
Selection Table.................................................................................................. 6
Block Diagram................................................................................................... 6
Pin Assignment................................................................................................. 7
Pin Description................................................................................................. 7
Absolute Maximum Ratings............................................................................. 8
D.C. Characteristics.......................................................................................... 8
A.C. Characteristics.......................................................................................... 9
Power-on Reset Characteristics...................................................................... 9
System Architecture....................................................................................... 10
Clocking and Pipelining.......................................................................................................... 10
Program Counter – PC............................................................................................................11
Stack...................................................................................................................................... 12
Arithmetic and Logic Unit – ALU............................................................................................ 12
Flash Program Memory.................................................................................. 13
Structure................................................................................................................................. 13
Special Vectors...................................................................................................................... 13
Look-up Table......................................................................................................................... 13
Table Program Example......................................................................................................... 14
In Circuit Programming.......................................................................................................... 15
On-chip Debug Support – OCDS........................................................................................... 16
RAM Data Memory.......................................................................................... 17
Structure................................................................................................................................. 17
Special Function Register.............................................................................. 17
Indirect Addressing Registers – IAR0, IAR1.......................................................................... 17
Memory Pointers – MP0, MP1............................................................................................... 19
Accumulator – ACC................................................................................................................ 19
Program Counter Low Register – PCL................................................................................... 20
Look-up Table Registers – TBLP, TBHP, TBLH...................................................................... 20
Status Register – STATUS..................................................................................................... 20
System Control Register – CTRL........................................................................................... 22
Rev. 1.10
2
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Oscillators....................................................................................................... 23
Oscillator Overview................................................................................................................ 23
System Clock Configuratios................................................................................................... 23
Internal RC Oscillator – HIRC................................................................................................ 23
Internal 32kHZ Oscillator – LIRC........................................................................................... 23
Operating Modes and System Clocks.......................................................... 24
System Clocks....................................................................................................................... 24
Control Register..................................................................................................................... 25
System Operation Modes....................................................................................................... 26
Operating Mode Switching..................................................................................................... 27
NORMAL Mode to SLOW Mode Switching ........................................................................... 28
SLOW Mode to NORMAL Mode Switching............................................................................ 29
Entering the SLEEP Mode..................................................................................................... 29
Entering the IDLE0 Mode....................................................................................................... 29
Entering the IDLE1 Mode....................................................................................................... 29
Standby Current Considerations............................................................................................ 30
Wake-up................................................................................................................................. 30
Programming Considerations................................................................................................. 31
Watchdog Timer.............................................................................................. 31
Watchdog Timer Clock Source............................................................................................... 31
Watchdog Timer Control Register.......................................................................................... 31
Watchdog Timer Operation.................................................................................................... 32
Reset and Initialisation................................................................................... 33
Reset Functions..................................................................................................................... 33
Reset Initial Conditions.......................................................................................................... 35
Input/Output Ports.......................................................................................... 37
Pull-high Resistors................................................................................................................. 37
Port A Wake-up...................................................................................................................... 38
I/O Port Control Registers...................................................................................................... 38
I/O Pin Structures................................................................................................................... 39
Programming Considerations................................................................................................. 39
Timer/Event Counters.................................................................................... 40
Configuring the Timer/Event Counter Input Clock Source..................................................... 40
Timer Register – TMR............................................................................................................ 40
Timer Control Register – TMRC............................................................................................. 40
Timer/Event Counter Operation............................................................................................. 41
Prescaler................................................................................................................................ 41
Programming Consideration.................................................................................................. 41
Rev. 1.10
3
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Touch Key Function....................................................................................... 42
Touch Key Structure............................................................................................................... 42
Touch Key Register Definition................................................................................................ 42
Touch Key Operation.............................................................................................................. 47
Touch Key Interrupt................................................................................................................ 47
Programming Considerations................................................................................................. 48
Interrupts......................................................................................................... 49
Interrupt Registers.................................................................................................................. 49
Interrupt Operation................................................................................................................. 51
External Interrupt.................................................................................................................... 52
Touch Key Interrupt................................................................................................................ 52
Timer/Event Counter Interrupt................................................................................................ 52
Time Base Interrupt................................................................................................................ 53
Interrupt Wake-up Function.................................................................................................... 54
Programming Considerations................................................................................................. 54
Application Circuits........................................................................................ 55
Instruction Set................................................................................................. 56
Introduction............................................................................................................................ 56
Instruction Timing................................................................................................................... 56
Moving and Transferring Data................................................................................................ 56
Arithmetic Operations............................................................................................................. 56
Logical and Rotate Operation................................................................................................ 57
Branches and Control Transfer.............................................................................................. 57
Bit Operations........................................................................................................................ 57
Table Read Operations.......................................................................................................... 57
Other Operations.................................................................................................................... 57
Instruction Set Summary............................................................................... 58
Table Conventions.................................................................................................................. 58
Instruction Definition...................................................................................... 60
Package Information...................................................................................... 69
8-pin SOP(150mil) Outline Dimensions................................................................................. 69
10-pin MSOP Outline Dimensions......................................................................................... 70
Product Tape and Real Specifications.......................................................... 71
Reel Dimensions.................................................................................................................... 71
Carrier Tape Dimensions........................................................................................................ 72
Rev. 1.10
4
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Note that 8-pin MCU package types are not marketed in the following
countries: USA, UK, Germany, The Netherlands, France and Italy.
Features
CPU Features
• Operating voltage:
♦♦
fSYS=8MHz: 2.7V~5.5V(BS83A04A-3)
♦♦
fSYS=8MHz: 2.2V~5.5V(BS83A04A-4)
• Up to 0.5μs instruction cycle with 8MHz system clock at VDD =5V
• Power down and wake-up functions to reduce power consumption
• Fully integrated low and high speed internal oscillators
♦♦
Low Speed – 32kHz
♦♦
High speed – 8MHz
• Multi-mode operation: NORMAL, SLOW, IDLE and SLEEP
• Fully integrated internal 8MHz oscillator requires no external components
• All instructions executed in one or two instruction cycles
• Table read instruction
• 63 powerful instructions
• Up to 4-level subroutine nesting
• Bit manipulation instruction
Peripheral Features
• Flash Program Memory: 1K×16
• RAM Data Memory: 96×8
• Watchdog Timer function
• Up to 8 bidirectional I/O lines
• External interrupt pin shared with I/O pin
• Single 8-bit programmable Timer/Event Counter
• Single Time-Base function for generation of fixed time interrupt signals
• Low voltage reset function
• 4 touch key functions
• Package types: 8-pin SOP and 10-pin MSOP
Rev. 1.10
5
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
General Description
The device is a Flash Memory type 8-bit high performance RISC architecture microcontroller with
fully integrated touch key functions.With the touch key function provided internally and including
a fully functional microcontroller as well as the convenience of Flash Memory multi-programming
features, this device has all the features to offer designers a reliable and easy means of implementing
Touch Keys within their product applications.
The touch key function is completely integrated eliminating the need for external components.
In addition to the flash program memory, other memory includes an area of RAM Data Memory.
Protective features such as an internal Watchdog Timer and Low Voltage Reset functions coupled
with excellent noise immunity and ESD protection ensure that reliable operation is maintained in
hostile electrical environments.
The device includes fully integrated low and high speed oscillators 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 inclusion of flexible I/O programming features, Timer/Event Counters and many
other features further enhance device functionality and flexibility.
This touch key device 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 all devices, the main distinguishing feature is the number of I/Os and
Touch Keys. The following table summarises the main features of each device.
Internal
Clock
Part No.
BS83A04A-3
BS83A04A-4
8MHz
System Program
Data
8-bit Touch
I/O
Clock Memory Memory
Timer Key
VDD
2.7V~5.5V
2.2V~5.5V
8MHz
1K×16
96×8
8
1
4
LVR
2.55V
2.10V
Stack Package
4
8SOP
10MSOP
Block Diagram
­ 
 

  €  Rev. 1.10
‚
ƒ „ ‚ ƒ …
6
   June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Pin Assignment
Pin Description
The function of each pin is listed in the following table, however the details of each pin is contained
in other sections of the datasheet.
Pin Name
Function
OPT
I/T
PA0
PAWU
PAPU
ST
INT
INTEG
ST
PA1
PAWU
PAPU
ST
KEY2
TKM0C1
NSI
PA2
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
PA3
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
KEY3
TKM0C1
NSI
PA4
PAWU
PAPU
ST
KEY4
TKM0C1
NSI
PA5
PAWU
PAPU
ST
KEY1
TKM0C1
NSI
PA6
PA6
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
PA7
PA7
PAWU
PAPU
ST
CMOS General purpose I/O. Register enabled pull-up and wake-up.
OCDSCK
OCDSCK
—
ST
OCDSDA
OCDSDA
—
ST
VDD
VDD
—
PWR
—
Power voltage
VSS
VSS
—
PWR
—
Ground
PA0/INT
PA1/KEY2
PA2
PA3/KEY3
PA4/KEY4
PA5/KEY1
O/T
Description
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
External interrupt
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
—
Touch key input
Touch key input
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
Touch key input
CMOS General purpose I/O. Register enabled pull-up and wake-up.
—
—
Touch key input
On-chip debug clock pin
CMOS On-chip debug data/address pin
Legend: I/T: Input type
O/T: Output type
OPT: Optional by register selection
PWR: Power
ST: Schmitt Trigger input
CMOS: CMOS output
NMOS: NMOS output
NSI: Non-standard input
It is recommended that the I/O pin PA7 should be configured as an input without pull-high resistor for 8-pin
package type.
Rev. 1.10
7
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Absolute Maximum Ratings
Supply Voltage.................................................................................................VSS−0.3V to VSS+6.0V
Input Voltage...................................................................................................VSS−0.3V to VDD+0.3V
Storage Temperature.....................................................................................................-50˚C to 125˚C
Operating Temperature...................................................................................................-40˚C to 85˚C
IOH Total.....................................................................................................................................-80mA
IOL Total...................................................................................................................................... 80mA
Total Power Dissipation ......................................................................................................... 500mW
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum
Ratings" may cause substantial damage to these devices. Functional operation of these devices at
other conditions beyond those listed in the specification is not implied and prolonged exposure to
extreme conditions may affect devices reliability.
D.C. Characteristics
Ta= 25˚C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
VDD
Operating Voltage (HIRC)
(BS83A04A-3)
—
fSYS = 8MHz
2.7
—
5.5
V
VDD
Operating Voltage (HIRC)
(BS83A04A-4)
—
fSYS = 8MHz
2.2
—
5.5
V
IDD1
Operating Current (HIRC)
(fSYS=fH, fS=fSUB= fLIRC)
3V
No load, fH = 8MHz
WDT enable
—
0.8
1.5
mA
5V
3V
IDD2
Operating Current (LIRC)
(fSYS=fL=fLIRC,fS=fSUB= fLIRC)
ISTB1
IDLE Mode Stanby Current(HIRC)
(fSYS=off,fS=fSUB=fLIRC)
ISTB2
IDLE Mode Stanby Current (LIRC)
(fSYS=off, fS=fSUB=fLIRC)
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
(BS83A04A-3)
—
VLVR
Low Voltage Reset Voltage
(BS83A04A-4)
ILVR
LVR Current
IOL
I/O Ports Sink Current
IOH
I/O Ports Source Current
RPH
Pull-high Resistance for I/O Ports
Rev. 1.10
5V
3V
5V
5V
No load, WDT enable
No load,WDT enable,
fSYS = 8MHz
No load,WDT enable,
fSYS = 32kHz
—
—
—
1.5
3.0
mA
—
10
20
μA
—
20
35
μA
—
1.5
3.0
μA
—
2.5
5.0
μA
—
1.5
3.0
μA
—
2.5
5.0
μA
0
—
1.5
V
0
—
0.2VDD
V
3.5
—
5.0
V
0.8VDD
—
VDD
V
LVR enable, VLVR =2.55V
-5%
2.55
+5%
V
—
LVR enable, VLVR =2.10V
-5%
2.10
+5%
V
—
LVR enable
—
20
30
μA
3V
VOL=0.1VDD
4
8
─
mA
5V
VOL=0.1VDD
10
20
─
mA
3V
VOH = 0.9VDD
-2
-4
─
mA
5V
VOH = 0.9VDD
-5
-10
─
mA
—
—
3V
—
20
60
100
kΩ
5V
—
10
30
50
kΩ
8
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
A.C. Characteristics
Ta= 25˚C
Symbol
Test Conditions
Parameter
Min.
Typ.
2.7V ~ 5.5V
DC
Ta=25˚C
-2%
VDD
fSYS
Operating Clock
fHIRC
System clock (HIRC)
Conditions
—
3V/5V
5V
—
Max.
Unit
—
8
MHz
8
+2%
MHz
-10%
32
+10%
kHz
-50%
32
+60%
kHz
fLIRC
System clock (LIRC)
fTIMER
Timer Input Frequency
—
—
—
—
1
fSYS
tINT
Interrupt pulse width
—
—
1
—
—
tSYS
tLVR
Low Voltage Width
—
—
120
240
480
μs
tSST
System start-up timer period
(wake-up from HALT)
—
fSYS=HIRC
—
1024
1025
fSYS=LIRC
—
1~2
3
2.7V~5.5V Ta=-40˚C~85˚C
tSYS
Note: 1. tSYS= 1/fSYS
2. To maintain the accuracy of the internal HIRC oscillator frequency, a 0.1μF decoupling capacitor should
be connected between VDD and VSS and located as close to the device as possible.
Power-on Reset Characteristics
Ta= 25˚C
Symbol
Test Conditions
Parameter
VDD
Conditions
Min.
Typ.
Max.
Unit
VPOR
VDD Start Voltage
─
─
─
─
100
mV
RRVDD
VDD Raising Rate
─
─
0.035
─
─
V/ms
tPOR
Minimum Time for VDD Stays at VPOR to
Ensure Power-on Reset
─
─
1
─
─
ms
Rev. 1.10
9
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 device takes advantage of the usual features found
within RISC microcontrollers providing increased speed of operation and enhanced performance.
The pipelining scheme is implemented in such a way that instruction fetching and instruction
execution are overlapped, hence instructions are effectively executed in one 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 with maximum reliability and flexibility. This makes the device suitable for low-cost,
high-volume production for controller applications.
Clocking and Pipelining
The mian system clock, derived from 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 Clocking and Pipelining
For instructions involving branches, such as jump or call instructions, two instruction cycles are
required to complete instruction execution. An extra cycle is required as the program takes one
cycle to firstly obtain the actual jump or call address and then another cycle to actually execute the
branch. The requirement for this extra cycle should be taken into account by programmers in timing
sensitive applications.
Rev. 1.10
10
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
 Instruction Fetching
Program Counter – PC
During program execution, the Program Counter is used to keep track of the address of the
next instruction to be executed. It is automatically incremented by one each time an instruction
is executed except for instructions, such as "JMP" or "CALL" that demand a jump to a nonconsecutive Program Memory address. It must be noted that only the lower 8 bits, known as the
Program Counter Low Register, are directly addressable by user.
When executing instructions requiring jumping to non-consecutive addresses such as a jump
instruction, a subroutine call, interrupt or reset, etc, the microcontroller manages program control
by loading the required address into the Program Counter. For conditional skip instructions, once
the condition has been met, the next instruction, which has already been fetched during the present
instruction execution, is discarded and a dummy cycle takes its place while the correct instruction is
obtained.
Program Counter
High Byte of Porgram
Low Byte of Porgram
PC9~ 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 in the present page of memory, which have
256 locations. When such program jumps are executed it should also be noted that a dummy cycle
will be inserted. The lower byte of the Program Counter is fully accessible under program control.
Manipulating the PCL might cause program branching, so an extra cycle is needed to pre-fetch.
Rev. 1.10
11
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Stack
This is a special part of the memory which is used to save the contents of the Program Counter
only. The stack is organized into 4 levels and neither part of the data nor part of the program space,
and is neither readable nor writeable. The activated level is indexed by the Stack Pointer, and is
neither readable nor writeable. At a subroutine call or interrupt acknowledge signal, the contents of
the Program Counter are pushed onto the stack. At the end of a subroutine or an interrupt routine,
signaled by a return instruction, RET or RETI, the Program Counter is restored to its previous value
from the stack. After a device reset, the Stack Pointer will point to the top of the stack.
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
S ta c k L e v e l 3
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 4
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.
Arithmetic and Logic Unit – ALU
The arithmetic-logic unit or ALU is a critical area of the microcontroller that carries out arithmetic
and logic operations of the instruction set. Connected to the main microcontroller data bus, the ALU
receives related instruction codes and performs the required arithmetic or logical operations after
which the result will be placed in the specified register. As these ALU calculation or operations may
result in carry, borrow or other status changes, the status register will be correspondingly updated to
reflect these changes. The ALU supports the following functions:
• Arithmetic operations: ADD, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA
• Logic operations: AND, OR, XOR, ANDM, ORM, XORM, CPL, CPLA
• Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA, RLC
• Increment and Decrement INCA, INC, DECA, DEC
• Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA, CALL, RET, RETI.
Rev. 1.10
12
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Flash Program Memory
The Program Memory is the location where the user code or program is stored. For this device the
Programm 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, this Flash device offers users the flexibility to debug and
develop their applications while also offering a means of field programming and updating.
Structure
The Program Memory has a capacity of 1K×16 bits. The Program Memory is addressed by the
Program Counter and also contains data, table information and interrupt entries information. Table
data, which can be setup in any location within the Program Memory, is addressed by separate table
pointer register.
Flash Program Memory Structure
Special Vectors
Within the Program Memory, certain locations are reerved for the reset and interrupts. The location
000H 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 registers, TBLP and TBHP. These registers
define the total address of the look-up table.
After setting up the table pointer, the table data can be retrieved from the Program Memory
using the "TABRDC [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
Rev. 1.10
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
13
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Instruction
Table Location Bits
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
TABRDC [m]
PC9
PC8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note: PC9, PC8: Current Program Counter bits
@[email protected]: Table Pointer TBLP bits
b9~b0: Table address location bits
Table Program Example
The accompanying example shows how the table pointer and table data is defined and retrieved from
the device. This example uses raw table data located in the last page which is stored there using the
ORG statement. The value at this ORG statement is "300H" which refers to the start address of the
last page within the 1K Program Memory of the microcontroller.
The table pointer is setup here to have an initial value of "06H". This will ensure that the first data
read from the data table will be at the Program Memory address "306H" or 6 locations after the
start of the last page. Note that the value for the table pointer is referenced to the first address of
the present page if the "TABRDC [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"TABRDL [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 the table read
instructions. If using the table read instructions, the Interrupt Service Routines may change the
value of 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.
Rev. 1.10
14
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Table Read Program Example
tempreg1 db
?;
tempreg2 db
?;
:
:
mov a,06h ;
mov tblp, a ;
:
:
tabrdl tempreg1 ;
;
;
dec tblp ;
tabrdl tempreg2 ;
;
;
;
;
;
:
:
org 300h;
temporary register #1
temporary register #2
initialise table pointer - note that this address is referenced
to the last page or present page
transfers value in table referenced by table pointer to tempreg1 data at prog.memory address "306H" transferred to to tempreg1 and TBLH
reduce value of table pointer by one
transfers value in table referenced by table pointer to tempreg2 data at prog.memory address "305H" transferred to
tempreg2 and TBLH in this example the data "1AH" is transferred to tempreg1 and data "0FH" to register tempreg2
the value "00H" will be transferred to the high byte
register TBLH
sets initial address of last page
dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh
:
:
In Circuit Programming
The provision of Flash type Program Memory provides the user with a means of convenient and easy
upgrades and modifications to their programs on the same device. As an additional convenience,
Holtek has provided a means of programming the microcontroller in-circuit using a 4-pin interface.
This provides manufacturers with the possibility of manufacturing their circuit boards complete with
a programmed or un-programmed microcontroller, and then programming or upgrading the program
at a later stage. This enables product manufacturers to easily keep their manufactured products
supplied with the latest program releases without removal and re-insertion of the device.
The Holtek Flash MCU to Writer Programming Pin correspondence table is as follows:
Holtek Write Pins
MCU Programming Pins
Function
ICPDA
PA0
Serial Address and data -- read/write
ICPCK
PA2
Programming Serial Clock
VDD
VDD
Power Supply (5.0V)
VSS
VSS
Ground
During the programming process, the user must there take care to ensure that no other outputs are
connected to these two pins.
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.
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.
Rev. 1.10
15
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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
An EV chip exists for the purposes of device emulation. This EV chip device also provides an "OnChip Debug" function to debug the device during the development process. The EV chip and the
actual MCU devices are almost functionally compatible except for the "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 HT-IDE development tools. The OCDSDA pin is the
OCDS Data/Address input/output pin while the OCDSCK pin is the OCDS clock input pin. When
users use the EV chip for debugging, other functions which are shared with the OCDSDA and
OCDSCK pins in the actual MCU device will have no effect in the EV chip. For a more detailed
OCDS description, refer to the corresponding document named "Holtek e-Link for 8-bit MCU
OCDS User’s Guide".
Rev. 1.10
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
16
Pin Description
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
RAM Data Memory
The Data Memory is an 8-bit wide RAM internal memory and is the location where temporary
information is stored.
Structure
Divided into two sections, the first of these is an area of RAM, known as the Special Function Data
Memory. Here are located registers which are necessary for correct operation of the device. Many
of these registers can be read from and written to directly under program control, however, some
remain protected from user manipulation.
The second area of Data Memory is known as the General Purpose Data Memory, which is reserved
for general purpose use. All locations within this area are read and write accessible under program
control.
The start address of the overall Data Memory is the address 00H.
0 0 H
IA R 0
0 1 H
M P 0
S p e c ia l
P u rp o s e
R e g is te r s
9 6 b y te s
G e n e ra l
P u rp o s e
R e g is te r s
5 F H
6 0 H
F F H
Data Memory
Special Function Register
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, do not actually physically exist as normal registers. The method of indirect addressing
for RAM data manipulation is using 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 Bank0 while the IAR1 and MP1 register pair can
access data from any bank. As the Indirect Addressing Registers are not physically implemented,
reading the Indirect Addressing Registers indirectly will return a result of "00H" and writing to the
registers indirectly will result in no operation.
Rev. 1.10
17
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
 
     

           
Special Purpose Data Memory
General Purpose Data Memory
Rev. 1.10
18
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 indirectly address and track data. When any
operation to the relevant Indirect Addressing Registers is carried out, the actual address which the
microcontroller directs 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. Direct Addressing can only be used with Bank 0, all other Banks
must be addressed indirectly using MP1 and IAR1. Note that for this device, the Memory Pointers,
MP0 and MP1, are both 8-bit registers and used to access the Data Memory together with their
corresponding indirect addressing registers IAR0 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.
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.
Rev. 1.10
19
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
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 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. Note
that bits 3~0 of the STATUS register are both readable and writeable bits.
Rev. 1.10
20
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
STATUS Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
TO
PDF
OV
Z
AC
C
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
0
0
x
x
x
x
"x" unknown
Rev. 1.10
Bit 7~6
Unimplemented, read as "0"
Bit 5
TO: Watchdog Time-Out flag
0: after power up or executing the "CLR WDT"or "HALT" instruction
1: a watchdog time-out occurred.
Bit 4
PDF: Power down flag
0: after power up or executing the "CLR WDT" instruction
1: by executing the "HALT" instruction
Bit 3
OV: 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 2
Z: 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 1
AC: 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 0
C: 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.
21
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
System Control Register – CTRL
CTRL Register
Bit
7
6
5
4
3
2
Name
FSYSON
—
—
—
—
R/W
R/W
—
—
—
—
POR
0
—
—
—
—
Bit 7
Rev. 1.10
1
0
LVRF
LRF
WRF
R/W
R/W
R/W
×
0
0
FSYSON: fSYS control in IDLE mode
0: disable
1: enable
Bit 6~3
unimplemented, read as "0"
Bit 2
LVRF: LVR function reset flag
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
Bit 1
LRF: LVR Control register software reset flag
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
Bit 0
WRF: reset caused by WE[4:0] setting
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
22
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Oscillators
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 Overview
The device includes two internal oscillators, a low speed oscillator and high speed oscillator. Both
can be chosen as the clock source for the main system clock however the slow speed oscillator is
also used as a clock source for other functions such as the Watchdog Timer, Time Base and Timer/
Event Counter. Both oscillators require no external components for their implementation. All
oscillator options are selected using registers. The high speed oscillator provides higher performance
but carries with it the disadvantage of higher power requirements, while the opposite is of course
true for the low speed oscillator. With the capability of dynamically switching between fast and
slow system clock, the device has the flexibility to optimise the performance/power ratio, a feature
especially important in power sensitive portable applications.
Type
Name
Freq.
Internal High Speed RC
HIRC
8MHz
Internal Low Speed RC
LIRC
32kHz
Oscillator Types
System Clock Configuratios
There are two system oscillators, one high speed oscillators and one low speed oscillators. The high
speed oscillator is a fully internal 8MHz RC oscillator. The low speed oscillator is a fully internal
32kHz RC oscillator. Selecting whether the low or high speed oscillator is used as the system
oscillator is implemented using the HLCLK bit and CKS2~CKS0 bits in the SMOD register and as
the system clock can be dynamically selected.
Internal RC Oscillator – HIRC
The internal RC oscillator is a fully integrated system oscillator requiring no external components.
The internal RC oscillator has the frequency of 8MHz .Device trimming during the manufacturing
process and the inclusion of internal frequency compensation circuit is 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 LIRC is a fully self-contained free running on-chip 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. After power on this LIRC oscillator will be permanently
enabled; there is no provision to disable the oscillator using register bits.
Rev. 1.10
23
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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, versa, lower speed clocks reduce current
consumption. As Holtek has provided this device 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 a high frequency fH or low frequency fL source, and is
selected using the HLCLK bit and CKS2~CKS0 bits in the SMOD register. Both the high and low
speed system clocks are sourced from internal RC oscillators.
  

 €  
­ ‚ ƒ
‚  „ ‚ … † 
€ System Clock Configurations
Note: When the system clock source fSYS is switched to fL from fH, the high speed oscillation will stop to conserve
the power. Thus there is no fH~fH/64 clock source for use by the peripheral circuits.
Rev. 1.10
24
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Control Register
A single register, SMOD, is used for overall control of the internal clocks within the device.
SMOD Register
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
CKS2
CKS1
CKS0
—
LTO
HTO
IDLEN
HLCLK
R/W
R/W
R/W
R/W
—
R
R
R/W
R/W
POR
0
0
0
—
0
0
1
1
Bit 7~5
CKS2 ~ CKS0: The system clock selection when HLCLK is "0"
000: fSUB (fLIRC)
001: fSUB (fLIRC)
010: fH/64
011: fH/32
100: fH/16
101: fH/8
110: fH/4
111: fH/2
These three bits are used to select which clock is used as the system clock source. In
addition to the system clock source, which can be 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 3
LTO: 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 1~2 clock cycles if the LIRC oscillator is used.
Bit 2
HTO: 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. 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 1024 clock cycles if the HIRC oscillator is used.
Bit 1
IDLEN: 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 0
HLCLK: 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 fL clock and the fH clock will be automatically switched off to conserve power.
25
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
Operation Mode
Description
CPU
fSYS
fSUB
fS
NORMAL Mode
On
fH~fH/64
On
On
SLOW Mode
On
fSUB
On
On
IDLE0 Mode
Off
Off
On
On
IDLE1 Mode
Off
On
On
On
SLEEP Mode
Off
Off
On
On
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 allows the microcontroller to operate normally with a clock source that will come from the
HIRC oscillator. 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 sourced from the low speed oscillator, the LIRC.
Running the microcontroller in this mode allows it to run with much lower operating currents. In the
SLOW Mode, fH is off.
SLEEP Mode
The SLEEP Mode is entered when an HALT instruction is executed and the IDLEN bit in the
SMOD register is low. In the SLEEP mode the CPU will be stopped. However the fSUB and fS clocks
will continue to operate if the Watchdog Timer function is enabled and its clock source is from fSUB.
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 inhibited from driving the CPU but some peripheral functions will remain
operational such as the Watchdog Timer and Timer/Event Counter. In the IDLE0 Mode, the system
oscillator will be stopped and the Watchdog Timer clock, fS, will be still on.
IDLE1 Mode
The IDLE1 Mode is entered when an 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 such as the Watchdog Timer and Timer/Event
Counter. In the IDLE1 Mode, the system oscillator will continue to run, and this system oscillator
may be high speed or low speed system oscillator. In the IDLE1 Mode the Watchdog Timer clock,
fS, will be on.
Rev. 1.10
26
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
  
   
  
  
   
Operating Mode Switching
The device can switch between operating modes dynamically allowing the user to select the best
performance/power ratio for the present task in hand. In this way microcontroller operations that
do not require high performance can be executed using slower clocks thus requiring less operating
current and prolonging battery life in portable applications.
In simple terms, Mode Switching between the NORMAL Mode and SLOW Mode is executed using the
HLCLK bit and CKS2~CKS0 bits in the SMOD register while Mode Switching from the NORMAL/
SLOW Modes to the SLEEP/IDLE Modes is executed via the HALT instruction. When a HALT
instruction is executed, whether the device enters the IDLE Mode or the SLEEP Mode is determined by
the condition of the IDLEN bit in the SMOD register and FSYSON in the 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 fL, the
high speed clock source will stop running to conserve power. When this happens it must be noted
that the fH/16 and fH/64 internal clock sources will also stop running, which may affect the operation
of other internal functions such as the Timer/Event Counter. The accompanying flowchart shows
what happens when the device moves between the various operating modes.
Rev. 1.10
27
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 set the HLCLK bit
to "0" and set the CKS2~CKS0 bits to "000" or "001" in the SMOD register. This will then use the
low speed system oscillator which will consume less power. Users may decide to do this for certain
operations which do not require high performance and can subsequently reduce power consumption.
The SLOW Mode is sourced from the LIRC oscillators 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. 1.10
28
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
SLOW Mode to NORMAL Mode Switching
In SLOW Mode the system uses the LIRC low speed system oscillator. To switch back to the
NORMAL Mode, where the high speed system oscillator is used, the HLCLK bit should be set to
"1" or HLCLK bit is "0", but CKS2~CKS0 is set to "010", "011", "100", "101", "110" or "111".
As a certain amount of time will be required for the high frequency clock to stabilise, the status of
the HTO bit is checked. The amount of time required for high speed system oscillator stabilization
depends upon which high speed system oscillator type is used.
Entering the SLEEP Mode
There is only one way for the device 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" and the WDT
is on. When this instruction is executed under the conditions described above, the following will occur:
• The system clock and Time Base clock will be stopped and the application program will stop at the
"HALT" instruction, but the WDT will remain with the clock source coming from the fSUB clock.
• 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 IDLE0 Mode
There is only one way for the device to enter the IDLE0 Mode and that is to execute the "HALT"
instruction in the application program with the IDLEN bit in SMOD register is equal to "1" and the
FSYSON bit in CTRL register is equal to "0". When this instruction is executed under the conditions
described above, the following will occur:
• The system clock will be stopped and the application program will stop at the "HALT" instruction,
but the Time Base clock and 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 device to enter the IDLE1 Mode and that is to execute the "HALT"
instruction in the application program with the IDLEN bit in SMOD register is equal to "1" and the
FSYSON bit in CTRL register is equal to "1". When this instruction is executed under the conditions
described above, the following will occur:
• The system clock and Time Base clock and fSUB clock will be on and the application program will
stop at the "HALT" instruction
• The Data Memory contents and registers will maintain their present condition.
• The WDT will be cleared and resume counting.
• The I/O ports will maintain their present conditions.
• In the status register, the Power Down flag, PDF, will be set and the Watchdog time-out flag, TO,
will be cleared.
Rev. 1.10
29
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Standby Current Considerations
As the main reason for entering the SLEEP or IDLE Mode is to keep the current consumption of
the device 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 device which has different package types, as there may
be unbonded 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. Also note that additional
standby current will also be required if using the LIRC oscillator.
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 microamps.
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. Although
this wake-up method will initiate a reset operation, the actual source of the wake-up can be
determined by examining the TO and PDF flags. The PDF flag is cleared by a system power-up or
executing the clear Watchdog Timer instructions and is set when executing the "HALT" instruction.
The TO flag is set if a WDT time-out occurs, and causes a wake-up that only resets the Program
Counter and Stack Pointer, the other flags remain in their original status.
Each pin on Port A can be setup using the PAWU register to permit a negative transition on the pin
to wake-up the system. When a Port A pin wake-up occurs, the program will resume execution at
the instruction following the "HALT" instruction. If the system is woken up by an interrupt, then
two possible situations may occur. The first is where the related interrupt is disabled or the interrupt
is enabled but the stack is full, in which case the program will resume execution at the instruction
following the "HALT" instruction. In this situation, the interrupt which woke-up the device will not
be immediately serviced, but will rather be serviced later when the related interrupt is finally enabled
or when a stack level becomes free. The other situation is where the related interrupt is enabled and
the stack is not full, in which case the regular interrupt response takes place. If an interrupt request
flag is set high before entering the SLEEP or IDLE Mode, the wake-up function of the related
interrupt will be disabled.
System Oscillator
Wake-up Time
(SLEEP Mode)
Wake-up Time
(IDLE0 Mode)
Wake-up Time
(IDLE1 Mode)
HIRC
1024 HIRC cycles
1024 HIRC cycles
LIRC
1~2 LIRC cycles
1~2 LIRC cycles
Wake-Up Times
Rev. 1.10
30
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
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 clock fSUB, which is sourced from the
LIRC oscillator. 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. The
LIRC internal oscillator has an approximate period frequency of 32KHz at a supply voltage of 5V.
However, it should be noted that this specified internal clock period can vary with VDD, temperature
and process variations.
Watchdog Timer Control Register
A single register, WDTC, controls the required time out period.
WDTC Register
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
WE4
WE3
WE2
WE1
WE0
WS2
WS1
WS0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
1
0
1
0
0
1
1
Bit 7~ 3
WE4 ~ WE0: WDT function software control
10101B: enabled
01010B: enabled (Default)
Other values: Reset MCU (Reset will be active after 2~3 LIRC clock for debounce time.)
If the MCU reset 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.
31
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
—
LVRF
LRF
WRF
R/W
R/W
—
—
—
—
R/W
R/W
R/W
POR
0
—
—
—
—
x
0
0
Bit 7,2~1 Decribed in other section
Bit 6~3
unimplemented, read as "0"
Bit 0
WRF: reset caused by WE[4:0] setting
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
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.
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 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 instructions and the
third is via a HALT instruction.
To clear the Watchdog Timer is to use the single "CLR WDT" instruction. A simple execution of
"CLR WDT" will clear the WDT.
The maximum time out period is when the 218 division ratio is selected. As an example, with the
LIRC oscillator as its source clock, this will give a maximum watchdog period of around 8 second
for the 218 division ratio, and a minimum timeout of 7.8ms for the 28 division ration.
   ­
    
€ ‚ € ƒ
 Watchdog Timer
Rev. 1.10
32
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Reset and Initialisation
A reset function is a fundamental part of any microcontroller ensuring that the device can be set
to some pre-determined 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.
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 four ways in which a microcontroller reset can occur, through events occurring both
internally and externally:
Power-on Reset
The most fundamental and unavoidable reset is the one that occurs after power is first applied to
the microcontroller. As well as ensuring that the Program Memory begins execution from the first
memory address, a power-on reset also ensures that certain other registers are preset to known
conditions. All the I/O port and port control registers will power up in a high condition ensuring that
all pins will be first set to inputs.
The microcontroller has an internal RC reset function, due to unstable power on conditions. This
time delay created by the RC network ensures the state of the POR remains low for an extended
period while the power supply stabilises. During this time, normal operation of the microcontroller
is inhibited. After the state of the POR reaches a certain voltage value, the reset delay time tPOR is
invoked to provide an extra delay time after which the microcontroller can begin normal operation.
Power-On Reset Timing Chart
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 a battery, the
LVR will automatically reset the device internally and the LVRF bit in the CTRL register will also
be set to1.
The LVR includes the following specifications: 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 tLVR, the LVR will ignore it and will
not perform a reset function. The actual VLVR is set by the LVRC register. If the LVS7~LVS0 bits
are changed to some certain values by the environmental noise, the LVR will reset the device after
2~3 LIRC clock cycles. When this happens, the LRF bit in the CTRL register will be set to 1.
After power on the register will have the value of 01010101B. Note that the LVR function will be
automatically disabled when the device enters the power down mode.
Rev. 1.10
33
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Low Voltage Reset Timing Chart
LVRC Register – BS83A04A-3
Bit
7
6
5
4
3
2
1
0
Name
LVS7
LVS6
LVS5
LVS4
LVS3
LVS2
LVS1
LVS0
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 ~ 0
LVS7 ~ LVS0: LVR Voltage Select control
01010101: 2.55V(default)
00110011: 2.55V
10011001: 2.55V
10101010: 2.55V
Other values: MCU reset (reset will be active after 2~3 LIRC clock for debounce time)
Note: S/W can write 00H~FFH to control LVR voltage, even to S/W reset MCU.If the
MCU reset caused by LVRC software reset, the LRF flag of CTRL register will be set.
LVRC Register – BS83A04A-4
Bit
7
6
5
4
3
2
1
0
Name
LVS7
LVS6
LVS5
LVS4
LVS3
LVS2
LVS1
LVS0
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
Bit7~0
LVS7 ~ LVS0: LVR Voltage Select control
01010101: 2.10V(default)
00110011: 2.10V
10011001: 2.10V
10101010: 2.10V
Other values: MCU reset (reset will be active after 2~3 LIRC clock for debounce time)
Note: S/W can write 00H~FFH to control LVR voltage, even to S/W reset MCU. If the
MCU reset caused LVRC software reset, the LRF flag of CTRL register will be set.
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
—
LVRF
LRF
WRF
R/W
R/W
—
—
—
—
R/W
R/W
R/W
POR
0
—
—
—
—
×
0
0
Bit 7,0
Decribed in other section
Bit 6~3
unimplemented, read as "0"
Bit 2
LVRF: LVR function reset flag
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
Bit 1
LRF: LVR Control register software reset flag
0: not active
1: active
This bit can be clear to "0", but can not set to "1".
Watchdog Time-out Reset during Normal Operation
Rev. 1.10
34
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
The Watchdog time-out Reset during normal operation is the same as a hardware power-on reset
except that the Watchdog time-out flag TO will be set to high.
WDT Time-out Reset during Normal Operation Timing Chart
Watchdog Time-out Reset during SLEEP or IDLE Mode
The Watchdog time-out Reset during SLEEP or IDLE Mode is a little different from other kinds
of reset. Most of the conditions remain unchanged except that the Program Counter and the Stack
Pointer will be cleared to "0" and the TO flag will be set to "1". Refer to the A.C. Characteristics for
tSST details.
WDT Time-out Reset during SLEEP or IDLE Timing Chart
Note: The tSST is 1024~1025 clock cycles if the system clock source is provided by HIRC. The tSST
is 1~2 clock for LIRC.
Reset Initial Conditions
The different types of reset described affect the reset flags in different ways. These flags, known
as PDF and TO are located in the status register and are controlled by various microcontroller
operations, such as the SLEEP or IDLE Mode function or Watchdog Timer. The reset flags are
shown in the table:
TO
PDF
0
0
Power-on reset
RESET Conditions
u
u
LVR reset during NORMAL or SLOW Mode operation
1
u
WDT time-out reset during NORMAL or SLOW Mode operation
1
1
WDT time-out reset during IDLE or SLEEP Mode operation
Note: "u" stands for unchanged
The following table indicates the way in which the various components of the microcontroller are
affected after a power-on reset occurs.
Item
Rev. 1.10
Condition After RESET
Program Counter
Reset to zero
Interrupts
All interrupts will be disabled
WDT
Clear after reset, WDT begins counting
Timer/Event Counter
Timer Counter 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
35
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 the microcontroller internal registers.
LVR &Power-on Reset
WDT Time-out
(Normal Operation)
WDT Time-out
(HALT)
MP0
xxxx xxxx
uuuu uuuu
uuuu uuuu
MP1
xxxx xxxx
uuuu uuuu
uuuu uuuu
ACC
xxxx xxxx
uuuu uuuu
uuuu uuuu
PCL
0000 0000
0000 0000
0000 0000
TBLP
xxxx xxxx
uuuu uuuu
uuuu uuuu
TBLH
xxxx xxxx
uuuu uuuu
uuuu uuuu
TBHP
---- -xxx
- - - - - uuu
- - - - - uuu
STATUS
--00 xxxx
- - 1 u uuuu
- - 1 1 uuuu
SMOD
0 0 0 - 0 0 11
0 0 0 - 0 0 11
u uu - u uuu
CTRL
0--- -x00
0--- -x00
u - - - - uuu
INTEG
---- --00
---- --00
- - - - - - uu
INTC0
-000 0000
-000 0000
- uuu uuuu
INTC1
--0- --0-
--0- --0-
--u- --u-
LVRC
0101 0101
0101 0101
uuuu uuuu
PA
1111 1111
1111 1111
uuuu uuuu
PAC
1111 1111
1111 1111
uuu u uuuu
PAPU
0000 0000
0000 0000
uuu u uuuu
PAWU
0000 0000
0000 0000
uuu u uuuu
WDTC
0 1 0 1 0 0 11
0 1 0 1 0 0 11
uuuu uuuu
TBC
--00 ----
--00 ----
- - uu - - - uuuu uuu u
Register
TMR
0000 0000
0000 0000
TMRC
--00 -000
--00 -000
- - uu - uu u
TKTMR
0000 0000
0000 0000
uuuu uuuu
TKC0
-000 0-00
-000 0-00
- uuu u - uu
TK16DL
0000 0000
0000 0000
uuuu uuuu
TK16DH
0000 0000
0000 0000
uuuu uuuu
TKC1
---- --11
---- --11
- - - - - - uu
TKM016DL
0000 0000
0000 0000
uuuu uuuu
TKM016DH
0000 0000
0000 0000
uuuu uuuu
TKM0ROL
0000 0000
0000 0000
uuuu uuuu
TKM0ROH
---- --00
---- --00
- - - - - - uu
TKM0C0
0000 0000
0000 0000
uuuu uuuu
TKM0C1
0-00 0000
0-00 0000
u - uu uuuu
Note: "-" not implement
"u" means "unchanged"
"x" means "unknown"
Rev. 1.10
36
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Input/Output Ports
Holtek microcontrollers offer considerable flexibility on their I/O ports. Most pins can have either an
input or output designation under user program control. Additionally, as there are pull-high resistors
and wake-up software configurations, the user is provided with an I/O structure to meet the needs of
a wide range of application possibilities.
The device provides bidirectional input/output lines labeled with port names PA. 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
Bit
Register
Name
7
6
5
4
3
2
1
0
PAWU
D7
D6
D5
D4
D3
D2
D1
D0
PAPU
D7
D6
D5
D4
D3
D2
D1
D0
PA
D7
D6
D5
D4
D3
D2
D1
D0
PAC
D7
D6
D5
D4
D3
D2
D1
D0
Pull-high Resistors
Many product applications require pull-high resistors for their switch inputs usually requiring the
use of an external resistor. To eliminate the need for these external resistors, all I/O pins, when
configured as an input have the capability of being connected to an internal pull-high resistor. These
pull-high resistors are selected using register PAPU etc.and are implemented using weak PMOS
transistors.
PAPU Register
Bit
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~0
Rev. 1.10
7
PAPU: PA port pull-high resistor control
0: disable
1: enable
37
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Port A Wake-up
The HALT instruction forces the microcontroller into the SLEEP or IDLE Mode which preserves
power, a feature that is important for battery and other low-power applications. Various methods
exist to wake-up the microcontroller, one of which is to change the logic condition on one of the
Port A pins from high to low. This function is especially suitable for applications that can be woken
up via external switches. Each pin on Port A can be selected individually to have this wake-up
feature using the PAWU register.
PAWU Register
Bit
7
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit 7~0
PAWU: PA wake-up function control
0: disable
1: enable
I/O Port Control Registers
The I/O port has its own control register known as PAC, 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 port is directly mapped to a bit in its associated port control
register. For the I/O pin to function as an input, the corresponding bit of the control register must
be written as a "1". This will then allow the logic state of the input pin to be directly read by
instructions. When the corresponding bit of the control register is written as a "0", the I/O pin will
be setup as a CMOS output. If the pin is currently setup as an output, instructions can still be used
to read the output register. However, it should be noted that the program will in fact only read the
status of the output data latch and not the actual logic status of the output pin.
PAC Register
Bit
6
5
4
3
2
1
0
Name
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
1
1
1
1
1
1
1
1
Bit 7~0
Rev. 1.10
7
PAC: I/O Port bit 7 ~ bit 0 Input/Output Control
0: output
1: input
38
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 Ports
Programming Considerations
Within the user program, one of the things first to consider is port initialisation. After a reset, all
of the I/O data and port control registers will be set to high. This means that all I/O pins will be
defaulted 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 are then programmed to setup
some pins as outputs, these output pins will have an initial high output value unless the associated
port data registers are first programmed. Selecting which pins are inputs and which are outputs can
be achieved byte-wide by loading the correct values into the appropriate port control register or
by programming individual bits in the port control register using the "SET [m].i" and "CLR [m].i"
instructions. Note that when using these bit control instructions, a read-modify-write operation takes
place. The microcontroller must first read in the data on the entire port, modify it to the required new
bit values and then rewrite this data back to the output ports.
Port A has the additional capability of providing wake-up functions. When the device is in the
SLEEP or IDLE Mode, various methods are available to wake the device up. One of these is a high
to low transition of any of the Port A pins. Single or multiple pins on Port A can be setup to have this
function.
Rev. 1.10
39
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Timer/Event Counters
The provision of timers form an important part of any microcontroller, giving the designer a means
of carrying out time related functions. The device contains an 8-bit timer. And the provision of an
internal prescaler to the clock circuitry on gives added range to the timer.
There are two types of registers related to the Timer/Event Counters. The first is the register that
contains the actual value of the timer and into which an initial value can be preloaded. Reading from
this register retrieves the contents of the Timer/Event Counter. The second type of associated register is
the Timer Control Register which defines the timer options and determines how the timer is to be used.
        
   ­  € ‚  Timer/Event Counter
Configuring the Timer/Event Counter Input Clock Source
The Timer/Event Counter clock source can originate from either fSYS or the fSUB Oscillator, the choice of
which is determined by the TS bit in the TMRC register. This internal clock source is first divided by a
prescaler, the division ratio of which is conditioned by the Timer Control Register bits TPSC0~TPSC2.
Timer Register – TMR
The timer register TMR is a special function register located in the Special Purpose Data Memory
and is the place where the actual timer value is stored. The value in the timer register increases by
one each time an internal clock pulse is received. The timer will count from the initial value loaded
by the preload register to the full count of FFH for the 8-bit Timer/Event Counter, at which point the
timer overflows and an internal interrupt signal is generated. The timer value will then reset with the
initial preload register value and continue counting.
Note that to achieve a maximum full range count of FFH, the preload register must first be cleared
to all zeros. Note that if the Timer/Event Counter is in an OFF condition and data is written to
its preload register, this data will be immediately written into the actual counter. However, if the
counter is enabled and counting, any new data written into the preload data register during this
period will remain in the preload register and will only be written into the actual counter the next
time an overflow occurs.
Timer Control Register – TMRC
It is the Timer Control Register together with its corresponding timer register that controls the full
operation of the Timer/Event Counter. Before the timer can be used, it is essential that the Timer
Control Register is fully programmed with the right data to ensure its correct operation, a process
that is normally carried out during program initialisation.
The timer-on bit, which is bit 4 of the Timer Control Register and known as TON bit, provides the
basic on/off control of the respective timer. Setting the bit high allows the counter to run. Clearing
the bit stops the counter. Bits 0~2 of the TMRC register determine the division ratio of the input
clock prescaler. In addition, the bit TS is used to select the internal clock source.
Rev. 1.10
40
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
TMRC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
TS
TON
—
TPSC2
TPSC1
TPSC0
R/W
—
—
R/W
R/W
—
R/W
R/W
R/W
POR
—
—
0
0
—
0
0
0
Bit 7~6
Bit 5
Bit 4
Bit 3
Bit 2~0
unimplemented, read as "0"
TS: Timer/Event Counter Clock Source
0: fSYS
1: fSUB
TON: Timer/Event Counter Counting Enable
0: disable
1: enable
unimplemented, read as "0"
TPSC2 ~ TPSC0: Timer prescaler rate selection
Timer internal clock=
000: fTP
001: fTP/2
010: fTP/4
011: fTP/8
100: fTP/16
101: fTP/32
110: fTP/64
111: fTP/128
Timer/Event Counter Operation
The Timer/Event Counter can be utilised to measure fixed time intervals, providing an internal
interrupt signal each time the Timer/Event Counter overflows. The internal clock is used as the timer
clock. The timer input clock is either fSYS or the fSUB Oscillator. However, this timer clock source is
further divided by a prescaler, the value of which is determined by the bits TPSC0~TPSC2 in the
Timer Control Register. The timer-on bit, TON must be set high to enable the timer to run. Each time
when an internal clock high to low transition occurs, the timer will reload the value already loaded
into the preload register and continues counting. A timer overflow condition and corresponding
internal interrupt is one of the wake-up sources, however, the internal interrupts can be disabled by
ensuring that the TE bit of the INTC0 register are reset to zero.
Prescaler
Bits TPSC0~TPSC2 of the TMRC register can be used to define a division ratio for the internal
clock source of the Timer/Event Counter enabling longer time out periods to be setup.
Programming Consideration
When the Timer/Event Counter is read, or if data is written to the preload register, the clock is
inhibited to avoid errors, however as this may result in a counting error, this should be taken into
account by the programmer. Care must be taken to ensure that the timers are properly initialized
before using them for the first time. The associated timer enable bits in the interrupt control register
must be properly set otherwise the internal interrupt associated with the timer will remain inactive.
The edge select, timer mode and clock source control bits in timer control register must also be
correctly set to ensure the timer is properly configured for the required application. It is also
important to ensure that an initial value is first loaded into the timer registers before the timer is
switched on; this is because after power-on the initial values of the timer registers are unknown.
Rev. 1.10
41
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
After the timer has been initialized the timer can be turned on and off by controlling the enable bit in
the timer control register. When the Timer/Event Counter overflows, its corresponding interrupt request
flag in the interrupt control register will be set. If the Timer/Event Counter interrupt is enabled this will
in turn generate an interrupt signal. However irrespective of whether the interrupts are enabled or not,
a Timer/Event Counter overflow will also generate a wake-up signal if the device is in a Power-down
condition. This situation may occur if the Timer/Event Counter is in the Event Counting Mode and if
the external signal continues to change state. In such a case, the Timer/Event Counter will continue to
count these external events and if an overflow occurs the device will be woken up from its Power-down
condition. To prevent such a wake-up from occurring, the timer interrupt request flag should first be set
high before issuing the "HALT" instruction to enter the Idle/Sleep Mode.
Touch Key Function
This device provides a touch key function. The touch key function is fully integrated and requires no
external components, allowing touch key function to be implemented by the simple manipulation of
internal registers.
Touch Key Structure
The touch keys are pin shared with the PA I/O pins, with the desired function chosen via register
bits. The Touch Keys have their own control logic circuits and register set.
Touch Key Register Definition
The touch key module contains four touch key functions, has its own suite of eight registers. The
following table shows the register set for this touch key module.
Name
Usage
TKTMR
Touch key 8-bit Timer/counter register
TKC0
Counter ON/OFF and clear control/ reference clock control/TKST start bit
TKM016DH
16-bit C/F counter high byte
TKM016DL
16-bit C/F counter low byte
TKM0ROL
Reference Oscillator internal capacitor select
TKM0ROH
Reference Oscillator internal capacitor select
TKM0C0
Control Register 0, Key Select
TKM0C1
Control Register 1, Touch key or I/O select
Touch Key Registers
Bit
Register
Name
7
TKTMR
D7
D6
D5
TKC0
—
TKRCOV
TKST
6
5
4
3
2
D4
D3
D2
D1
D0
—
TK16S1
TK16S0
D0
TKCFOV TK16OV
1
0
TK16DL
D7
D6
D5
D4
D3
D2
D1
TK16DH
D7
D6
D5
D4
D3
D2
D1
D0
TKC1
—
—
—
—
—
—
TKFS1
TKFS0
TKM016DL
D7
D6
D5
D4
D3
D2
D1
D0
TKM016DH
D7
D6
D5
D4
D3
D2
D1
D0
TKM0ROL
D7
D6
D5
D4
D3
D2
D1
D0
TKM0ROH
—
—
—
—
—
—
D9
D8
TKM0C0
TKM0C1
M0MXS1 M0MXS0 M0DFEN M0FILEN M0SOFC M0SOF2 M0SOF1 M0SOF0
M0TSS
—
M0ROEN M0KOEN M0K4IO
M0K3IO
M0K2IO
M0K1IO
Touch Key Register Listing
Rev. 1.10
42
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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
The Time slot counter overflow time setup is (256-TKTMR[7:0]) x 32
TKC0 Register
Bit
7
6
5
4
3
2
1
0
Name
—
TKRCOV
TKST
TKCFOV
TK16OV
—
TK16S1
TK16S0
R/W
—
R/W
R/W
R/W
R/W
—
R/W
R/W
POR
—
0
0
0
0
—
0
0
Bit 7
unimplemented, read as "0"
Bit 6
TKRCOV: Time slot counter overflow flag
0: no overflow
1: overflow
If module 0 time slot counter is overflow, the Touch Key Interrupt request flag will be
set (TKMF) and module key oscillator and reference oscillator 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 auto off.
Bit 5
TKST: Start Touch Key detection control bit
0: stop
0→1: on
If this bit is 0, the 16-bit C/F counter, 16-bit counter, 5-bit time slot counter will aotu
clear except for the 8-bit programmable time slot counter is not kown, its overflow
time is setup by the user.
0→1: By the TKST rising edge, the 16-bit C/F counter, 16-bit counter, 5-bit time slot
counter and 8-bit time slot timer counter will auto on and enable key oscillator and
reference oscillator output clock input these counter.
Bit 4
TKCFOV: Touch key module 16-bit C/F counter overflow flag
0: not overflow
1: overflow
This bit must be clear by software.
Bit 3
TK16OV: Touch key module 16-bit counter overflow flag
0: not overflow
1: overflow
This bit must be clear by software.
unimplemented, read as "0"
Bit 2
Bit 1,0
Rev. 1.10
TK16S1, TK16S0: touch key module 16-bit counter clock source selection
00: fSYS /1
01: fSYS /2
10: fSYS /4
11: fSYS /8
43
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 1~0
TKFS1~TKFS0: touch key OSC frequency selection
00: 500kHz
01: 1000kHz
10: 1500kHz
11: 2000kHz
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
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 high byte contents
TKM016DL 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
Module 0 16-bit counter low byte contents
TKM016DH 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
Module 0 16-bit counter high byte contents
TKM0ROL Register
Rev. 1.10
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 Oscillator internal capacitor selection
The reference oscillator is selected as TKM0RO[9:0] x 50pF / 1024.
44
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
TKM0ROH 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 Oscillator internal capacitor selection
The reference oscillator is selected as TKM0RO[9:0] x 50pF / 1024.
TKM0C0 Register
Bit
Name
Rev. 1.10
7
6
5
4
3
2
M0MXS1 M0MXS0 M0DFEN M0FILEN M0SOFC M0SOF2
M0SOF1
M0SOF0
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
M0MXS1, M0MXS0: Multiplexer Key Select
00: KEY1
01: KEY2
10: KEY3
11: KEY4
Bit 5
M0DFEN: Multi-frequency function control
0: disable
1: enable
Bit 4
M0FILEN: Filter function control
0: disable
1: enable
Bit 3
M0SOFC: C to F oscillator frequency-hopping function control
0: controlled by the MnSOF2~ MnSOF0 bits
1: controlled by hardware,regardless of what is the state of MnSOF2~ MnSOF0 bits
When controlled by hardware, the time slot counter selected by the M0SOF2~M0SOF0
bits adjust the C to F oscillator frequency automatically.
Bit 2~0
M0SOF2~M0SOF0: Selecting key oscillator or reference oscillator frequency as the
C to F oscillator is controlled by software
000: 1380kHz
001: 1500kHz
010: 1670kHz
011: 1830kHz
100: 2000kHz
101: 2230kHz
110: 2460kHz
111: 2740kHz
The frequency mentioned here willl differ with the external or internal capacitor value.
If the key oscillator frequency is selected as 2MHz, users can adjust the frequency in
scale when selecting other frequencies.
45
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
TKM0C1 Register
Bit
7
6
Name
M0TSS
—
5
R/W
R/W
—
R/W
POR
0
—
0
4
3
2
1
0
M0K4IO
M0K3IO
M0K2IO
M0K1IO
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
M0ROEN M0KOEN
Bit 7
M0TSS: Time Slot counter Select
0: Reference Oscillator
1: fSYS /4
Bit 6
unimplemented, read as "0"
Bit 5
M0ROEN: Reference Oscillator control
0: disable
1: enable
Bit 4
M0KOEN: Key Oscillator control
0: disable
· 1: enable
Bit 3
M0K4IO: I/O Pin or Touch Key 4 Function Select
0: I/O
1: Touch key input
Bit 2
M0K3IO: I/O Pin or Touch Key 3 Function Select
0: I/O
1: Touch key input
Bit 1
M0K2IO: I/O Pin or Touch Key 2 Function Select
0: I/O
1: Touch key input
Bit 0
M0K1IO: I/O Pin or Touch Key 1 Function Select
0: I/O
1: Touch key input
It is recommended that the I/O pin PA7 should be configured as an input without pull-high resistor
for 8-pin package type
Rev. 1.10
46
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
The device contains four touch key inputs which are shared with logical I/O pins, with the desired
function selected using register bits. The Touch Key module also has its own interrupt vectors and
set of interrupt flags.
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.
When a TKST rising edge occurs, the 16-bit C/F counter, 16-bit counter, 5-bit time slot counter and
8-bit time slot timer counter will auto on.While a TKST falling edge occurs, the 16-bit C/F counter,
16-bit counter and 5-bit time slot counter will auto off except that for the 8-bit programmable time
slot counter, its overflow time is setup by the user.
When the 5-bit time slot counter is overflow, the key oscillator and reference oscillator auto stop and
the 16-bit C/F counter, 16-bit counter, 5-bit time slot counter and 8-bit time slot timer counter will
auto off. The 5-bit time slot counter and 8-bit time slot timer counter clock source derive from the
reference oscillator or fSYS/4.
The reference oscillator is enabled by setting the bit M0ROEN in the TKM0C1 register to "1".The
key oscillator is enabled by setting the bit M0KOEN in the TKM0C register to "1".
If the time slot counter is overflow, an interrupt will occur.
Touch Key Interrupt
The touch key module, which consists of four touch keys, has one interrupt. If the time slot counter
is overflow, an interrupt will occur. At the same time, the 16-bit C/F counter, 16-bit counter, 5-bit
time slot and 8-bit time slot timer counter will auto off. Only when all the enabled touch keys are
overflow, an interrupt will occur.
When the touch key module 16-bit C/F counter is overflow, the 16-bit C/F counter overflow flag will
be set to 1. This bit is not be automatically reset but rather must be reset manually by the application
program. More details regarding the touch key interrupt are located in the interrupt section of the
datasheet.
Rev. 1.10
47
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
Touch Key (1 Set = Touch Key*4)
KEY1
Key
Osc
KEY�
Key
Osc
KEY3
Key
Osc
KEY�
Key
Osc
fSYS/1,fSYS/2,fSYS/4,fSYS/6,fSYS/8
Ref Osc
fSYS/4
M�x.
Filter
M�ltifreq�ency
16-bit Co�nter
Overflow
M�x.
5-bit time slot
co�nter
8-bit time slot
timer co�nter
16-bit C/F
Co�nter
Overflow
Overflow
Overflow
8-bit time slot Timer
co�nter preload register
Note: The dotted lines show the portions that each touch key individually has.
Touch Key Module Block Diagram




Touch Key or I/O Function Selection
Rev. 1.10
48
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 device contains several external
interrupt and internal interrupts functions. The external interrupt is generated by the action of the
external INT pin, while the internal interrupts are generated by various internal functions such as the
Touch Keys, Timer/Event Counter and Time Base.
Interrupt Registers
Overall interrupt control, which basically means the setting of request flags when certain
microcontroller conditions occur and the setting of interrupt enable bits by the application program,
is controlled by a series of registers, located in the Special Purpose Data Memory, as shown in the
accompanying table. The number of registers depends upon the device chosen but fall into three
categories. The first is the INTC0~INTC1 registers which setup the primary interrupts, the second is
the INTEG register which setups the external interrupt trigger edge type.
Each register contains a number of enable bits to enable or disable individual interrupts 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.
Interrupt Register Bit Naming Conventions
Function
Enable Bit
Request Flag
Global
EMI
—
INT Pin
INTE
INTF
Touch Key Module
TKME
TKMF
TE
TF
TBE
TBF
Timer/Event Counter
Time Base
Interrupt Register Contents
Name
Bit
7
6
5
4
3
2
1
0
INTEG
—
—
—
—
—
—
INTS1
INTS0
INTC0
—
TF
TKMF
INTF
TE
TKME
INTE
EMI
INTC1
—
—
TBF
—
—
—
TBE
—
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
INTS1
INTS0
R/W
—
—
—
—
—
—
R/W
R/W
POR
—
—
—
—
—
—
0
0
INTEG Register
Rev. 1.10
Bit 7~2
unimplemented, read as "0"
Bit 1~0
INT2S1, INT2S0: Interrupt edge control for INT pin
00: disable
01: rising edge
10: falling edge
11: both rising and falling edge
49
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
INTC0 Register
Bit
7
6
5
4
3
2
1
0
Name
—
TF
TKMF
INTF
TE
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
Bit 7
Unimplemented, read as "0"
Bit 6
TF: Timer/Event Counter 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
TE: Timer/Event Counter interrupt control
0: disable
1: enable
Bit 2
TKME: Touch Key module interrupt control
0: disable
1: enable
Bit 1
INTE: INT interrupt control
0: disable
1: enable
Bit 0
EMI: Global interrupt control
0: disable
1: enable
INTC1 Register
Rev. 1.10
Bit
7
6
5
4
3
2
1
0
Name
—
—
TBF
—
—
—
TBE
—
R/W
—
—
R/W
—
—
—
R/W
—
POR
—
—
0
—
—
—
0
—
Bit 7~6
Unimplemented, read as "0"
Bit 5
TBF: Time Base interrupt request flag
0: no request
1: interrupt request
Bit 4~2
Unimplemented, read as "0"
Bit 1
TBE: Time Base interrupt Control
0: disable
1: enable
Bit 0
Unimplemented, read as "0"
50
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Interrupt Operation
When the conditions for an interrupt event occur, such as a Touch Key Counter overflow, Timer/
Event Counter overflow, 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 instruction 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. These interrupt sources have their 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.
xxF
Legend
Req�est Flag� no a�to reset in ISR
xxF
Req�est Flag� a�to reset in ISR
xxE
Enable Bits
EMI a�to disabled in ISR
Interr�pt
Name
External
Req�est
Flags
INTF
Enable
Bits
INTE
To�ch Key Mod�le
TKMF
TKME
EMI
08H
Timer/Event Co�nter
TF
TE
EMI
0CH
TBF
TBE
EMI
1�H
Time Base
Master
Enable
EMI
Vector
0�H
Priority
High
Low
Interrupt Structure
Rev. 1.10
51
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
External Interrupt
The external interrupt is controlled by signal transitions on the INT pin. 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 the 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.
Touch Key Interrupt
For a Touch Key interrupt to occur, the global interrupt enable bit, EMI, and the corresponding
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 16-bit time slot
counter in the relevant Touch Key module 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.
When the touch key module 16-bit C/F counter is overflow, the 16-bit C/F counter overflow flag will
be set to 1. This bit is not be automatically reset but rather must be reset manually by the application
program.
Timer/Event Counter Interrupt
For a Timer/Event Counter interrupt to occur, the global interrupt enable bit, EMI, and the
corresponding timer interrupt enable bit, TE must first be set. An actual Timer/Event Counter
interrupt will take place when the Timer/Event Counter request flag, TF, is set, a situation that will
occur when the relevant Timer/Event Counter overflows. When the interrupt is enabled, the stack is
not full and a Timer/Event Counter overflow occurs, a subroutine call to the relevant timer interrupt
vector, will take place. When the interrupt is serviced, the timer interrupt request flag, TF, will be
automatically reset and the EMI bit will be automatically cleared to disable other interrupts.
Rev. 1.10
52
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Time Base Interrupt
Time Base Interrupt function is to provide regular time signal in the form of an internal interrupt.
It is controlled by the overflow signal from its respective timer function. When this happens its
respective interrupt request flag, TBF, will be set. To allow the program to branch to their respective
interrupt vector addresses, the global interrupt enable bit, EMI and Time Base enable bit, TBE,
must first be set. When the interrupt is enabled, the stack is not full and the Time Base overflows, a
subroutine call to their respective vector locations will take place. When the interrupt is serviced, the
respective interrupt request flag, TBF, will be automatically reset and the EMI bit will be cleared to
disable other interrupts.
The purpose of the Time Base Interrupt is to provide an interrupt signal at fixed time periods. Their
clock sources originate from the internal clock source fSYS or fSUB. The input clock passes through
a divider, the division ratio of which is selected by programming the appropriate bits in the TBC
register to obtain longer interrupt periods whose value ranges. The clock source that generates fTP,
which in turn controls the Time Base interrupt period, can originate from several different sources,
as shown in the System Operating Mode section.
TBC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
TB1
TB0
—
—
—
—
R/W
—
—
R/W
R/W
—
—
—
—
POR
—
—
0
0
—
—
—
—
Bit 7~6
Unimplemented, read as "0"
Bit 5~4
TB1~TB0: Select Time Base 1 Time-out Period
00: 1024/fTP
01: 2048/ fTP
10: 4096/ fTP
11: 8192/ fTP
Bit 3~0
Unimplemented, read as "0"
TB1-TB0
fSYS
fSUB
MUX
fTP
÷ �10~�13
Time Base
TS
Time Base Structure
Rev. 1.10
53
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 is stopped, situations such as external edge
transitions on the external interrupt pins, a low power supply voltage or 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 a
software instruction.
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 entering the 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 in advance.
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. 1.10
54
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Application Circuits
VDD
VDD
0.1uF
VSS
PAD
PA5/Key1
PAD
PA1/Key2
PAD
PA3/Key3
PAD
PA4/Key4
PA7
PA6
Control
Device
PA0/INT
PA2
VDD
VDD
0.1uF
VSS
VDD
PAD
PA5/Key1
PAD
PA1/Key2
PA6
PAD
PA3/Key3
PA0/INT
PAD
PA4/Key4
PA2
Rev. 1.10
VDD
VDD
VDD
PA7
55
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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.
Rev. 1.10
56
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 setup 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.
Rev. 1.10
57
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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]
Rev. 1.10
58
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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 Operation
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 Operation
TABRD [m]
TABRDC [m]
TABRDL [m]
Miscellaneous
NOP
CLR [m]
SET [m]
CLR WDT
CLR WDT1
CLR WDT2
SWAP [m]
SWAPA [m]
HALT
Note: 1. For skip instructions, if the result of the comparison involves a skip then two cycles are required, if no
skip takes place only one cycle is required.
2. Any instruction which changes the contents of the PCL will also require 2 cycles for execution.
3. For the “CLR WDT1” and “CLR WDT2” instructions the TO and PDF flags may be affected by
the execution status. The TO and PDF flags are cleared after both “CLR WDT1” and “CLR WDT2”
instructions are consecutively executed. Otherwise the TO and PDF flags remain unchanged.
Rev. 1.10
59
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Instruction Definition
ADC A,[m]
Description
Operation
Affected flag(s)
Add Data Memory to ACC with Carry
The contents of the specified Data Memory, Accumulator and the carry flag are added.
The result is stored in the Accumulator.
ACC ← ACC + [m] + C
OV, Z, AC, C
ADCM A,[m]
Description
Operation
Affected flag(s)
Add ACC to Data Memory with Carry
The contents of the specified Data Memory, Accumulator and the carry flag are added. The result is stored in the specified Data Memory.
[m] ← ACC + [m] + C
OV, Z, AC, C
Add Data Memory to ACC
ADD A,[m]
Description
The contents of the specified Data Memory and the Accumulator are added.
The result is stored in the Accumulator.
Operation
Affected flag(s)
ACC ← ACC + [m]
OV, Z, AC, C
ADD A,x
Description
Operation
Affected flag(s)
Add immediate data to ACC
The contents of the Accumulator and the specified immediate data are added. The result is stored in the Accumulator.
ACC ← ACC + x
OV, Z, AC, C
ADDM A,[m]
Description
Operation
Affected flag(s)
Add ACC to Data Memory
The contents of the specified Data Memory and the Accumulator are added. The result is stored in the specified Data Memory.
[m] ← ACC + [m]
OV, Z, AC, C
AND A,[m]
Description
Operation
Affected flag(s)
Logical AND Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise logical AND operation. The result is stored in the Accumulator.
ACC ← ACC ″AND″ [m]
Z
AND A,x
Description
Operation
Affected flag(s)
Logical AND immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bit wise logical AND operation. The result is stored in the Accumulator.
ACC ← ACC ″AND″ x
Z
ANDM A,[m]
Description
Operation
Affected flag(s)
Logical AND ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical AND
operation. The result is stored in the Data Memory.
[m] ← ACC ″AND″ [m]
Z
Rev. 1.10
60
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
CALL addr
Description
Operation
Affected flag(s)
Subroutine call
Unconditionally calls a subroutine at the specified address. The Program Counter then
increments by 1 to obtain the address of the next instruction which is then pushed onto the
stack. The specified address is then loaded and the program continues execution from this
new address. As this instruction requires an additional operation, it is a two cycle instruction.
Stack ← Program Counter + 1
Program Counter ← addr
None
CLR [m]
Description
Operation
Affected flag(s)
Clear Data Memory
Each bit of the specified Data Memory is cleared to 0.
[m] ← 00H
None
CLR [m].i
Description
Operation
Affected flag(s)
Clear bit of Data Memory
Bit i of the specified Data Memory is cleared to 0.
[m].i ← 0
None
CLR WDT
Description
Operation
Affected flag(s)
Clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CLR WDT1
Description
Operation
Affected flag(s)
Pre-clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in
conjunction with CLR WDT2 and must be executed alternately with CLR WDT2 to have
effect. Repetitively executing this instruction without alternately executing CLR WDT2 will
have no effect.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CLR WDT2
Description
Operation
Affected flag(s)
Pre-clear Watchdog Timer
The TO, PDF flags and the WDT are all cleared. Note that this instruction works in conjunction
with CLR WDT1 and must be executed alternately with CLR WDT1 to have effect.
Repetitively executing this instruction without alternately executing CLR WDT1 will have no
effect.
WDT cleared
TO ← 0
PDF ← 0
TO, PDF
CPL [m]
Description
Operation
Affected flag(s)
Complement Data Memory
Each bit of the specified Data Memory is logically complemented (1′s complement). Bits which
previously contained a 1 are changed to 0 and vice versa.
[m] ← [m]
Z
Rev. 1.10
61
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
CPLA [m]
Description
which 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
DAA [m]
Description
Operation
Affected flag(s)
Decimal-Adjust ACC for addition with result in Data Memory
Convert the contents of the Accumulator value to a BCD (Binary Coded Decimal) value
resulting from the previous addition of two BCD variables. If the low nibble is greater than 9
or if AC flag is set, then a value of 6 will be added to the low nibble. Otherwise the low nibble
remains unchanged. If the high nibble is greater than 9 or if the C flag is set, then a value of 6
will be added to the high nibble. Essentially, the decimal conversion is performed by adding
00H, 06H, 60H or 66H depending on the Accumulator and flag conditions. Only the C flag
may be affected by this instruction which indicates that if the original BCD sum is greater than
100, it allows multiple precision decimal addition.
[m] ← ACC + 00H or
[m] ← ACC + 06H or [m] ← ACC + 60H or
[m] ← ACC + 66H
C
DEC [m]
Description
Operation
Affected flag(s)
Decrement Data Memory
Data in the specified Data Memory is decremented by 1.
[m] ← [m] − 1
Z
DECA [m]
Description
Operation
Affected flag(s)
Decrement Data Memory with result in ACC
Data in the specified Data Memory is decremented by 1. The result is stored in the
Accumulator. The contents of the Data Memory remain unchanged.
ACC ← [m] − 1
Z
HALT
Description
Operation
Affected flag(s)
Enter power down mode
This instruction stops the program execution and turns off the system clock. The contents of the Data Memory and registers are retained. The WDT and prescaler are cleared. The power
down flag PDF is set and the WDT time-out flag TO is cleared.
TO ← 0
PDF ← 1
TO, PDF
INC [m]
Description
Operation
Affected flag(s)
Increment Data Memory
Data in the specified Data Memory is incremented by 1.
[m] ← [m] + 1
Z
INCA [m]
Description
Operation
Affected flag(s)
Increment Data Memory with result in ACC
Data in the specified Data Memory is incremented by 1. The result is stored in the Accumulator.
The contents of the Data Memory remain unchanged.
ACC ← [m] + 1
Z
Rev. 1.10
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
62
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
JMP addr
Description
Operation
Affected flag(s)
Jump unconditionally
The contents of the Program Counter are replaced with the specified address. Program
execution then continues from this new address. As this requires the insertion of a dummy
instruction while the new address is loaded, it is a two cycle instruction.
Program Counter ← addr
None
MOV A,[m]
Description
Operation
Affected flag(s)
Move Data Memory to ACC
The contents of the specified Data Memory are copied to the Accumulator.
ACC ← [m]
None
MOV A,x
Description
Operation
Affected flag(s)
Move immediate data to ACC
The immediate data specified is loaded into the Accumulator.
ACC ← x
None
MOV [m],A
Description
Operation
Affected flag(s)
Move ACC to Data Memory
The contents of the Accumulator are copied to the specified Data Memory.
[m] ← ACC
None
NOP
Description
Operation
Affected flag(s)
No operation
No operation is performed. Execution continues with the next instruction.
No operation
None
OR A,[m]
Description
Operation
Affected flag(s)
Logical OR Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise
logical OR operation. The result is stored in the Accumulator.
ACC ← ACC ″OR″ [m]
Z
OR A,x
Description
Operation
Affected flag(s)
Logical OR immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bitwise logical OR operation. The result is stored in the Accumulator.
ACC ← ACC ″OR″ x
Z
ORM A,[m]
Description
Operation
Affected flag(s)
Logical OR ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical OR operation. The result is stored in the Data Memory.
[m] ← ACC ″OR″ [m]
Z
RET
Description
Operation
Affected flag(s)
Return from subroutine
The Program Counter is restored from the stack. Program execution continues at the restored
address.
Program Counter ← Stack
None
Rev. 1.10
63
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
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
the 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
Carry bit and the original carry flag is rotated into the bit 0. The rotated result is stored in the
Accumulator and the contents of the Data Memory remain unchanged.
ACC.(i+1) ← [m].i; (i=0~6)
ACC.0 ← C
C ← [m].7
C
RR [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right
The contents of the specified Data Memory are rotated right by 1 bit with bit 0 rotated into bit 7.
[m].i ← [m].(i+1); (i=0~6)
[m].7 ← [m].0
None
Rev. 1.10
64
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
RRA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right with result in ACC
Data in the specified Data Memory and the carry flag are rotated right by 1 bit with bit 0
rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the
Data Memory remain unchanged.
ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← [m].0
None
RRC [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right through Carry
The contents of the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0
replaces the Carry bit and the original carry flag is rotated into bit 7.
[m].i ← [m].(i+1); (i=0~6)
[m].7 ← C
C ← [m].0
C
RRCA [m]
Description
Operation
Affected flag(s)
Rotate Data Memory right through Carry with result in ACC
Data in the specified Data Memory and the carry flag are rotated right by 1 bit. Bit 0 replaces the Carry bit and the original carry flag is rotated into bit 7. The rotated result is stored in the Accumulator and the contents of the Data Memory remain unchanged.
ACC.i ← [m].(i+1); (i=0~6)
ACC.7 ← C
C ← [m].0
C
SBC A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with Carry
The contents of the specified Data Memory and the complement of the carry flag are
subtracted from the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is
positive or zero, the C flag will be set to 1.
ACC ← ACC − [m] − C
OV, Z, AC, C
SBCM A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with Carry and result in Data Memory
The contents of the specified Data Memory and the complement of the carry flag are subtracted from the Accumulator. The result is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
[m] ← ACC − [m] − C
OV, Z, AC, C
SDZ [m]
Description
Operation
Affected flag(s)
Skip if decrement Data Memory is 0
The contents of the specified Data Memory are first decremented by 1. If the result is 0 the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
[m] ← [m] − 1
Skip if [m]=0
None
Rev. 1.10
65
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
SDZA [m]
Description
Operation
Affected flag(s)
Skip if decrement Data Memory is zero with result in ACC
The contents of the specified Data Memory are first decremented by 1. If the result is 0, the following instruction is skipped. The result is stored in the Accumulator but the specified Data Memory contents remain unchanged. As this requires the insertion of a dummy
instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0,
the program proceeds with the following instruction.
ACC ← [m] − 1
Skip if ACC=0
None
SET [m]
Description
Operation
Affected flag(s)
Set Data Memory
Each bit of the specified Data Memory is set to 1.
[m] ← FFH
None
SET [m].i
Description
Operation
Affected flag(s)
Set bit of Data Memory
Bit i of the specified Data Memory is set to 1.
[m].i ← 1
None
SIZ [m]
Description
Operation
Affected flag(s)
Skip if increment Data Memory is 0
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the
following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program
proceeds with the following instruction.
[m] ← [m] + 1
Skip if [m]=0
None
SIZA [m]
Description
Operation
Affected flag(s)
Skip if increment Data Memory is zero with result in ACC
The contents of the specified Data Memory are first incremented by 1. If the result is 0, the following instruction is skipped. The result is stored in the Accumulator but the specified
Data Memory contents remain unchanged. As this requires the insertion of a dummy
instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not
0 the program proceeds with the following instruction.
ACC ← [m] + 1
Skip if ACC=0
None
SNZ [m].i
Description
Operation
Affected flag(s)
Skip if bit i of Data Memory is not 0
If bit i of the specified Data Memory is not 0, the following instruction is skipped. As this
requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is 0 the program proceeds with the following instruction.
Skip if [m].i ≠ 0
None
SUB A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC
The specified Data Memory is subtracted from the contents of the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
ACC ← ACC − [m]
OV, Z, AC, C
Rev. 1.10
66
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
SUBM A,[m]
Description
Operation
Affected flag(s)
Subtract Data Memory from ACC with result in Data Memory
The specified Data Memory is subtracted from the contents of the Accumulator. The result is stored in the Data Memory. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
[m] ← ACC − [m]
OV, Z, AC, C
SUB A,x
Description
Operation
Affected flag(s)
Subtract immediate data from ACC
The immediate data specified by the code is subtracted from the contents of the Accumulator. The result is stored in the Accumulator. Note that if the result of subtraction is negative, the C flag will be cleared to 0, otherwise if the result is positive or zero, the C flag will be set to 1.
ACC ← ACC − x
OV, Z, AC, C
SWAP [m]
Description
Operation
Affected flag(s)
Swap nibbles of Data Memory
The low-order and high-order nibbles of the specified Data Memory are interchanged.
[m].3~[m].0 ↔ [m].7~[m].4
None
SWAPA [m]
Description
Operation
Affected flag(s)
Swap nibbles of Data Memory with result in ACC
The low-order and high-order nibbles of the specified Data Memory are interchanged. The result is stored in the Accumulator. The contents of the Data Memory remain unchanged.
ACC.3~ACC.0 ← [m].7~[m].4
ACC.7~ACC.4 ← [m].3~[m].0
None
SZ [m]
Description
Operation
Affected flag(s)
Skip if Data Memory is 0
If the contents of the specified Data Memory is 0, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
Skip if [m]=0
None
SZA [m]
Description
Operation
Affected flag(s)
Skip if Data Memory is 0 with data movement to ACC
The contents of the specified Data Memory are copied to the Accumulator. If the value is zero, the following instruction is skipped. As this requires the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle instruction. If the result is not 0 the program proceeds with the following instruction.
ACC ← [m]
Skip if [m]=0
None
SZ [m].i
Description
Operation
Affected flag(s)
Skip if bit i of Data Memory is 0
If bit i of the specified Data Memory is 0, the following instruction is skipped. As this requires
the insertion of a dummy instruction while the next instruction is fetched, it is a two cycle
instruction. If the result is not 0, the program proceeds with the following instruction.
Skip if [m].i=0
None
Rev. 1.10
67
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
TABRD [m]
Description
Operation
Affected flag(s)
Read table (specific page) to TBLH and Data Memory
The low byte of the program code (specific page) addressed by the table pointer pair (TBHP and TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
TABRDC [m]
Description
Operation
Affected flag(s)
Read table (current page) to TBLH and Data Memory
The low byte of the program code (current page) addressed by the table pointer (TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
TABRDL [m]
Description
Operation
Affected flag(s)
Read table (last page) to TBLH and Data Memory
The low byte of the program code (last page) addressed by the table pointer (TBLP) is moved to the specified Data Memory and the high byte moved to TBLH.
[m] ← program code (low byte)
TBLH ← program code (high byte)
None
XOR A,[m]
Description
Operation
Affected flag(s)
Logical XOR Data Memory to ACC
Data in the Accumulator and the specified Data Memory perform a bitwise logical XOR operation. The result is stored in the Accumulator.
ACC ← ACC ″XOR″ [m]
Z
XORM A,[m]
Description
Operation
Affected flag(s)
Logical XOR ACC to Data Memory
Data in the specified Data Memory and the Accumulator perform a bitwise logical XOR operation. The result is stored in the Data Memory.
[m] ← ACC ″XOR″ [m]
Z
XOR A,x
Description
Operation
Affected flag(s)
Logical XOR immediate data to ACC
Data in the Accumulator and the specified immediate data perform a bitwise logical XOR operation. The result is stored in the Accumulator.
ACC ← ACC ″XOR″ x
Z
Rev. 1.10
68
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Package Information
Note that the package information provided here is for consultation purposes only. As this
information may be updated at regular intervals users are reminded to consult the Holtek website for
the latest version of the package information.
Additional supplementary information with regard to packaging is listed below. Click on the relevant
section to be transferred to the relevant website page.
• Further Package Information (include Outline Dimensions, Product Tape and Reel Specifications)
• Packing Meterials Information
• Carton information
Rev. 1.10
69
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
8-pin SOP (150mil) Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
—
A
—
0.236 BSC
B
—
0.154 BSC
—
C
0.012
—
0.020
C′
—
0.193 BSC
—
D
—
—
0.069
E
—
0.050 BSC
—
F
0.004
—
0.010
G
0.016
—
0.050
H
0.004
—
0.010
α
0°
—
8°
Symbol
Rev. 1.10
Dimensions in mm
Min.
Nom.
Max.
—
A
—F
6.00 BSC
B
—
3.90 BSC
—
C
0.31
—
0.51
C′
—
4.90 BSC
—
D
—
—
1.75
E
—
1.27 BSC
—
F
0.10
—
0.25
G
0.40
—
1.27
H
0.10
—
0.25
α
0°
—
8°
70
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
10-pin MSOP Outline Dimensions
Symbol
Min.
Nom.
Max.
A
—
—
0.043
A1
0.000
—
0.006
A2
0.030
0.033
0.037
B
0.007
—
0.013
C
0.003
—
0.009
D
—
0.118 BSC
—
E
—
0.193 BSC
—
E1
—
0.118 BSC
—
e
—
0.020 BSC
—
L
0.016
0.024
0.031
L1
—
0.037 BSC
—
y
—
0.004
—
θ
0°
—
8°
Symbol
Rev. 1.10
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
—
—
1.10
A1
0.00
—
0.15
A2
0.75
0.85Q
0.95
B
0.17
—
0.33
C
0.08
—
0.23
D
—
3.00 BSC
—
E
—
4.90 BSC
—
E1
—
3.00 BSC
—
e
—
0.50 BSC
—
L
0.40
0.60
0.80
L1
—
0.95 BSC
—
y
—
0.10
—
θ
0°
—
8°
71
June 22, 2014
BS83A04A-3/BS83A04A-4
Touch I/O 8-bit Flash MCU
Copyright© 2014 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time
of publication. However, Holtek assumes no responsibility arising from the use of
the specifications described. The applications mentioned herein are used solely
for the purpose of illustration and Holtek makes no warranty or representation that
such applications will be suitable without further modification, nor recommends
the use of its products for application that may present a risk to human life due to
malfunction or otherwise. Holtek's products are not authorized for use as critical
components in life support devices or systems. Holtek reserves the right to alter
its products without prior notification. For the most up-to-date information, please
visit our web site at http://www.holtek.com.tw.
Rev. 1.10
72
June 22, 2014