SONIX SN8PC20 User manual

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 1Version 0.9
SN8PC20
USER’S MANUAL
Version 0.9
S
SO ON Ni iX X 8 8- -B Bi it t M Mi ic cr ro o- -C Co on nt tr ro ol ll le er r
SONIX reserves the right to make change without further notice to any products herein to improve reliability, function or design. SONIX does not
assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent
rights nor the rights of others. SONIX products are not designed, intended, or authorized for us as components in systems intended, for surgical
implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SONIX product
could create a situation where personal injury or death may occur. Should Buyer purchase or use SONIX products for any such unintended or
unauthorized application. Buyer shall indemnify and hold SONIX and its officers, employees, subsidiaries, affiliates and distributors harmless against
all claims, cost, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use even if such claim alleges that SONIX was negligent regarding the design or manufacture of
the part.

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 2Version 0.9
AMENDENT HISTORY
Version
Date
Description
VER 0.1
Oct. 2007
First issue.
VER 0.2
Nov. 2007
1. Modify 455KHz crystal application circuit.
2. Add “@GreenMode”macro to control system green mode.
3. Modify IR application circuit.
VER 0.3
Jan. 2008
1. Add “Development Tool”section.
2. Modify internal low RC frequency to 10KHz @3V.
VER 0.4
May 2009
1. Modify some formals.
2. Add IHRC frequency curves.
VER 0.5
Jun. 2011
1. Add external low clock crystal type 32KHz.
VER 0.6
Sep. 2011
1. Add SN8PC2016S and SN8PC2014S package type.
VER 0.7
Mar. 2014
1. Modify “ELECTRICAL CHARACTERISTIC”operating temperature range from 0~70
℃to -20~70℃.
VER 0.8
Dec. 2014
1. Modify “ELECTRICAL CHARACTERISTIC”Supply voltage
VER 0.9
May 2018
1. Modify “IR APPLICATION CIRCUIT“section.
2. Modify ”ICE and EV-KIT APPLICATION NOTIC”section.

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 3Version 0.9
Table of Content
AMENDENT HISTORY................................................................................................................................ 2
1
1
1
PRODUCT OVERVIEW......................................................................................................................... 6
1.1 FEATURES........................................................................................................................................ 6
1.2 SYSTEM BLOCK DIAGRAM.......................................................................................................... 7
1.3 PIN ASSIGNMENT........................................................................................................................... 8
1.4 PIN DESCRIPTIONS......................................................................................................................... 9
1.5 PIN CIRCUIT DIAGRAMS............................................................................................................. 10
2
2
2
CENTRAL PROCESSOR UNIT (CPU) .............................................................................................. 11
2.1 PROGRAM MEMORY (ROM)....................................................................................................... 11
2.1.1 RESET VECTOR (0000H) ...................................................................................................... 12
2.1.2 INTERRUPT VECTOR (0008H)............................................................................................. 13
2.1.3 LOOK-UP TABLE DESCRIPTION........................................................................................ 15
2.1.4 JUMP TABLE DESCRIPTION............................................................................................... 17
2.1.5 CHECKSUM CALCULATION............................................................................................... 19
2.2 DATA MEMORY (RAM)................................................................................................................ 20
2.2.1 SYSTEM REGISTER .............................................................................................................. 20
2.2.1.1 SYSTEM REGISTER TABLE ............................................................................................ 20
2.2.1.2 SYSTEM REGISTER DESCRIPTION ............................................................................... 20
2.2.1.3 BIT DEFINITION of SYSTEM REGISTER....................................................................... 21
2.2.2 ACCUMULATOR ................................................................................................................... 22
2.2.3 PROGRAM FLAG................................................................................................................... 23
2.2.4 PROGRAM COUNTER........................................................................................................... 24
2.2.5 H, L REGISTERS..................................................................................................................... 27
2.2.6 Y, Z REGISTERS..................................................................................................................... 28
2.2.7 R REGISTER ........................................................................................................................... 29
2.3 ADDRESSING MODE .................................................................................................................... 30
2.3.1 IMMEDIATE ADDRESSING MODE .................................................................................... 30
2.3.2 DIRECTLY ADDRESSING MODE ....................................................................................... 30
2.3.3 INDIRECTLY ADDRESSING MODE................................................................................... 30
2.4 STACK OPERATION...................................................................................................................... 31
2.4.1 OVERVIEW............................................................................................................................. 31
2.4.2 STACK REGISTERS............................................................................................................... 32
2.4.3 STACK OPERATION EXAMPLE.......................................................................................... 33
2.5 CODE OPTION TABLE.................................................................................................................. 34
2.5.1 Reset_Pin code option.............................................................................................................. 34
2.5.2 Security code option................................................................................................................. 34
3
3
3
RESET..................................................................................................................................................... 35
3.1 OVERVIEW..................................................................................................................................... 35
3.2 POWER ON RESET......................................................................................................................... 36
3.3 WATCHDOG RESET...................................................................................................................... 36
3.4 BROWN OUT RESET ..................................................................................................................... 37
3.4.1 THE SYSTEM OPERATING VOLTAGE.............................................................................. 38
3.4.2 LOW VOLTAGE DETECTOR (LVD) ................................................................................... 38
3.4.3 BROWN OUT RESET IMPROVEMENT............................................................................... 39
3.5 EXTERNAL RESET........................................................................................................................ 40
3.6 EXTERNAL RESET CIRCUIT ....................................................................................................... 40
3.6.1 Simply RC Reset Circuit .......................................................................................................... 40
3.6.2 Diode & RC Reset Circuit........................................................................................................ 41

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 4Version 0.9
3.6.3 Zener Diode Reset Circuit........................................................................................................ 41
3.6.4 Voltage Bias Reset Circuit ....................................................................................................... 42
3.6.5 External Reset IC...................................................................................................................... 42
4
4
4
SYSTEM CLOCK.................................................................................................................................. 43
4.1 OVERVIEW..................................................................................................................................... 43
4.2 FCPU (INSTRUCTION CYCLE)...................................................................................................... 43
4.3 SYSTEM HIGH-SPEED CLOCK.................................................................................................... 44
4.3.1 HIGH_CLK CODE OPTION................................................................................................... 44
4.3.2 INTERNAL HIGH-SPEED OSCILLATOR RC TYPE (IHRC)............................................. 44
4.3.3 EXTERNAL HIGH-SPEED OSCILLATOR........................................................................... 44
4.3.4 EXTERNAL OSCILLATOR APPLICATION CIRCUIT....................................................... 45
4.4 SYSTEM LOW-SPEED CLOCK..................................................................................................... 46
4.5 OSCM REGISTER........................................................................................................................... 47
4.6 SYSTEM CLOCK MEASUREMENT............................................................................................. 47
4.7 SYSTEM CLOCK TIMING............................................................................................................. 48
5
5
5
SYSTEM OPERATION MODE........................................................................................................... 50
5.1 OVERVIEW..................................................................................................................................... 50
5.2 NORMAL MODE ............................................................................................................................ 51
5.3 SLOW MODE .................................................................................................................................. 51
5.4 POWER DOWN MDOE .................................................................................................................. 51
5.5 GREEN MODE ................................................................................................................................ 52
5.6 OPERATING MODE CONTROL MACRO.................................................................................... 53
5.7 WAKEUP......................................................................................................................................... 54
5.7.1 OVERVIEW............................................................................................................................. 54
5.7.2 WAKEUP TIME ...................................................................................................................... 54
5.7.3 P1W WAKEUP CONTROL REGISTER................................................................................ 55
6
6
6
INTERRUPT........................................................................................................................................... 56
6.1 OVERVIEW..................................................................................................................................... 56
6.2 INTEN INTERRUPT ENABLE REGISTER................................................................................... 56
6.3 INTRQ INTERRUPT REQUEST REGISTER ................................................................................ 57
6.4 GIE GLOBAL INTERRUPT OPERATION .................................................................................... 57
6.5 PUSH, POP ROUTINE..................................................................................................................... 58
6.6 EXTERNAL INTERRUPT OPERATION (INT0)........................................................................... 59
6.7 T0 INTERRUPT OPERATION........................................................................................................ 60
6.8 MULTI-INTERRUPT OPERATION............................................................................................... 61
7
7
7
I/O PORT ................................................................................................................................................ 62
7.1 OVERVIEW..................................................................................................................................... 62
7.2 I/O PORT MODE ............................................................................................................................. 63
7.3 I/O PULL UP REGISTER ................................................................................................................ 64
7.4 I/O PORT DATA REGISTER.......................................................................................................... 65
8
8
8
TIMERS .................................................................................................................................................. 66
8.1 WATCHDOG TIMER...................................................................................................................... 66
8.2 TIMER 0(T0)................................................................................................................................... 68
8.2.1 OVERVIEW............................................................................................................................. 68
8.2.2 T0 Timer Operation.................................................................................................................. 68
8.2.3 T0M MODE REGISTER ......................................................................................................... 69
8.2.4 T0C COUNTING REGISTER................................................................................................. 69
8.2.5 T0 TIMER OPERATION SEQUENCE................................................................................... 70
9
9
9
IR OUTPUT............................................................................................................................................ 71
9.1 OVERVIEW..................................................................................................................................... 71
9.2 IR CONTROL REGISTER............................................................................................................... 71
9.2.1 IRM MODE REGISTER.......................................................................................................... 71

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 5Version 0.9
9.2.2 IRC COUNTING REGISTER.................................................................................................. 72
9.2.3 IRR AUTO-LOAD REGISTER............................................................................................... 72
9.2.4 IRD IR DUTY CONTROL REGISTER .................................................................................. 73
9.3 IR OUTPUT OPERATION SEQUENCE......................................................................................... 74
9.4 IR APPLICATION CIRCUIT .......................................................................................................... 75
1
1
10
0
0
INSTRUCTION TABLE ................................................................................................................... 76
1
1
11
1
1
ELECTRICAL CHARACTERISTIC.............................................................................................. 77
11.1 ABSOLUTE MAXIMUM RATING................................................................................................ 77
11.2 ELECTRICAL CHARACTERISTIC............................................................................................... 77
11.3 CHARACTERISTIC GRAPHS ................................................................................................................. 78
1
1
12
2
2
DEVELOPMENT TOOL .................................................................................................................. 79
12.1 SN8PC20 EV-KIT ............................................................................................................................. 79
12.2 ICE AND EV-KIT APPLICATION NOTIC...................................................................................... 80
1
1
13
3
3
OTP PROGRAMMING PIN............................................................................................................. 81
13.1 THE PIN ASSIGNMENT OF EASY WRITER TRANSITION BOARD SOCKET: .............................................. 81
13.2 PROGRAMMING PIN MAPPING: .......................................................................................................... 82
1
1
14
4
4
MARKING DEFINITION................................................................................................................. 83
14.1 INTRODUCTION............................................................................................................................ 83
14.2 MARKING INDETIFICATION SYSTEM...................................................................................... 83
14.3 MARKING EXAMPLE ................................................................................................................... 84
14.4 DATECODE SYSTEM.................................................................................................................... 84
1
1
15
5
5
PACKAGE INFORMATION ........................................................................................................... 85
15.1 P-DIP 20 PIN.................................................................................................................................... 85
15.2 SOP 20 PIN....................................................................................................................................... 86
15.3 SSOP 20 PIN..................................................................................................................................... 87
15.4 SOP 16 PIN....................................................................................................................................... 88
15.5 SOP 14 PIN....................................................................................................................................... 89

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 6Version 0.9
1
1
1
PRODUCT OVERVIEW
1.1 FEATURES
Features Selection Table
CHIP
ROM
RAM
Stack
T0
Oscillator
I/O
IR
Output
Wakeup
Pin No.
Package
Ext.
455K
Ext.
4M
Int.
8M
SN8PC01
0.5K*16
32
4
-
V
-
-
16
Fix 38KHz,
Normal current
9
PDIP20/SOP20
SN8PC13
2K*16
48
4
V
-
V
-
16
Duty/cycle programmable,
Normal current
15
PDIP20/SOP20/
SSOP20
SN8PC20
2K*16
56
4
V
V
V
V
18
Duty/cycle programmable,
400mA sink current
16
PDIP20/SOP20/
SSOP20
SN8PC2016
2K*16
56
4
V
V
V
V
14
Duty/cycle programmable,
400mA sink current
12
SOP16
SN8PC2014
2K*16
56
4
V
V
V
V
12
Duty/cycle programmable,
400mA sink current
10
SOP14

Memory configuration

2 interrupt sources
OTP ROM size: 2K * 16 bits.
1 internal interrupts: T0
RAM size: 56 * 8 bits.
1 external interrupts: INT0

4 levels stack buffer.

One 8-bit timer. (T0).
T0: Basic timer.

I/O pin configuration
Bi-directional: P0, P1, P5.

One channel duty/cycle programmable IR output.
400mA IR output pin: P5.4/IROUT
Wakeup: P0, P1 level change trigger.

Five system clocks
Pull-up resisters: P0, P1, P5.
External high clock: RC type up to 8 MHz
External Interrupt trigger edge: P0.0
External high clock: Crystal type up to 8 MHz
controlled by PEDGE register.
External low clock: Crystal type 32KHz and 455KHz
Internal high clock: RC type 8MHz

1-Level LVD.
Internal low clock: RC type 10KHz(3V)

Fcpu (Instruction cycle)

Four operating modes
Fcpu = Fosc/1, Fpsc/2, Fosc/4, Fosc/8
Normal mode: Both high and low clock active
Slow mode: Low clock only

Powerful instructions
Sleep mode: Both high and low clock stop
One clocks per instruction cycle (1T)
Green mode: Periodical wakeup by timer
Most of instructions are one cycle only.
All ROM area JMP instruction.

Package (Chip form support)
All ROM area CALL address instruction.
PDIP 20 pin
All ROM area lookup table function (MOVC).
SOP 20 pin
SSOP 20 pin
SOP 16 pin
SOP 14 pin

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 7Version 0.9
1.2 SYSTEM BLOCK DIAGRAM
INTERRUPT
CONTROL
EXTERNAL
HIGH OSC.
ACC
INTERNAL
LOW RC
TIMING GENERATOR
RAM
SYSTEM REGISTERS
1-Level LVD
(Low Voltage Detector)
WATCHDOG TIMER
TIMER & COUNTER
P0 P5P1
IR Generator
ALU
PC
FLAGS
IR OTP
ROM
INTERNAL HIGH
RC 8MHz
IR Output

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 8Version 0.9
1.3 PIN ASSIGNMENT
SN8PC20P (PDIP 20 pins)
SN8PC20S (SOP 20 pins)
SN8PC20X (SSOP 20 pins)
VDD
1
U
20
VSS
P0.0/INT0
2
19
P5.4/IROUT
P0.1
3
18
P5.0
P0.2/RST/VPP
4
17
P1.7
P0.3/XIN
5
16
P1.6
P0.4/XOUT
6
15
P1.5
P0.5
7
14
P1.4
P0.6
8
13
P1.3
P0.7
9
12
P1.2
P1.0
10
11
P1.1
SN8PC2016S (SOP 16 pins)
VDD
1
U
16
VSS
P0.0/INT0
2
15
P5.4/IROUT
P0.1
3
14
P5.0
P0.2/RST/VPP
4
13
P1.5
P0.3/XIN
5
12
P1.4
P0.4/XOUT
6
11
P1.3
P0.5
7
10
P1.2
P1.0
8
9
P1.1
SN8PC2014S (SOP 14 pins)
VDD
1
U
14
VSS
P0.0/INT0
2
13
P5.4/IROUT
P0.1
3
12
P5.0
P0.2/RST/VPP
4
11
P1.3
P0.3/XIN
5
10
P1.2
P0.4/XOUT
6
9
P1.1
P0.5
7
8
P1.0

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 9Version 0.9
1.4 PIN DESCRIPTIONS
PIN NAME
TYPE
DESCRIPTION
VDD, VSS
P
Power supply input pins for digital and analog circuit.
P0.2/RST/
VPP
I, P
RST: System external reset input pin. Schmitt trigger structure, active “low”, normal stay to
“high”.
VPP: OTP power input pin in programming mode.
P0.2: Input only pin with Schmitt trigger structure and no pull-up resistor.
XIN/P0.3
I/O
XIN: Oscillator input pin while external oscillator enable (crystal and RC).
P0.3: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors and level change
wake-up function as input mode.
XOUT/P0.4
I/O
XOUT: Oscillator output pin while external crystal enable.
P0.4: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors and level change
wake-up function as input mode.
P0.0/INT0
I/O
P0.0: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors and level change
wake-up function as input mode.
INT0: External interrupt 0 input pin.
P0.1,
P0[7:5]
I/O
P0: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors and level change wake-up
function as input mode.
P1[7:0]
I/O
P1: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors and level change wake-up
function controlled by P1W register as input mode.
P5.0
I/O
P5.0: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors as input mode.
P5.4/IROUT
I/O
P5.4: Bi-direction pin. Schmitt trigger structure. Built-in pull-up resistors as input mode.
IROUT: Duty/cycle programmable IR signal output pin.

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 10 Version 0.9
1.5 PIN CIRCUIT DIAGRAMS
I/O with Schmitt-trigger (ViH=0.7*Vdd, ViL=0.3*Vdd) and Pull-up Resistor(200KΩ@3V):
Pull-Up
Resistor
Output
Latch
Pin
PnUR
PnM
Input Bus
Output Bus
Input Only with Schmitt-trigger (ViH=0.7*Vdd, ViL=0.3*Vdd) and Vpp High Voltage:
Pin
OTP Program Mode
Input Bus
OTP Vpp Input
Reset Pin Code Option
Reset Trigger
Oscillator shared I/O with Schmitt-trigger (ViH=0.7*Vdd, ViL=0.3*Vdd) and Pull-up Resistor(200KΩ@3V):
Pull-Up
Resistor
Output
Latch
Pin
PnUR
PnM
Input Bus
Output Bus
Oscillator
Code Option
Oscillator
IR output shared I/O with Schmitt-trigger (ViH=0.7*Vdd, ViL=0.3*Vdd) and Pull-up Resistor(200KΩ@3V):
Pull-Up
Resistor
Output
Latch
Pin
PnUR
PnM
Input Bus
Output Bus
IREN
IR Signal

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 11 Version 0.9
2
2
2
CENTRAL PROCESSOR UNIT (CPU)
2.1 PROGRAM MEMORY (ROM)
2K words ROM
ROM
0000H
Reset vector
User reset vector
Jump to user start address
0001H
General purpose area
.
.
0007H
0008H
Interrupt vector
User interrupt vector
0009H
General purpose area
User program
.
.
000FH
0010H
0011H
.
.
.
.
.
07FCH
End of user program
07FDH
Reserved
07FEH
07FFH
The ROM includes Reset vector, Interrupt vector, General purpose area and Reserved area. The Reset vector is
program beginning address. The Interrupt vector is the head of interrupt service routine when any interrupt occurring.
The General purpose area is main program area including main loop, sub-routines and data table.

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 12 Version 0.9
2.1.1 RESET VECTOR (0000H)
A one-word vector address area is used to execute system reset.
Power On Reset (NT0=1, NPD=0).
Watchdog Reset (NT0=0, NPD=0).
External Reset (NT0=1, NPD=1).
After power on reset, external reset or watchdog timer overflow reset, then the chip will restart the program from
address 0000h and all system registers will be set as default values. It is easy to know reset status from NT0, NPD
flags of PFLAG register. The following example shows the way to define the reset vector in the program memory.
Example: Defining Reset Vector
ORG
0
; 0000H
JMP
START
; Jump to user program address.
…
ORG
10H
START:
; 0010H, The head of user program.
…
; User program
…
ENDP
; End of program

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 13 Version 0.9
2.1.2 INTERRUPT VECTOR (0008H)
A 1-word vector address area is used to execute interrupt request. If any interrupt service executes, the program
counter (PC) value is stored in stack buffer and jump to 0008h of program memory to execute the vectored interrupt.
Users have to define the interrupt vector. The following example shows the way to define the interrupt vector in the
program memory.
Note: ”PUSH”, “POP”instructions save and load ACC/PFLAG without (NT0, NPD). PUSH/POP buffer is a
unique buffer and only one level.
Example: Defining Interrupt Vector. The interrupt service routine is following ORG 8.
.CODE
ORG
0
; 0000H
JMP
START
; Jump to user program address.
…
ORG
8
; Interrupt vector.
PUSH
; Save ACC and PFLAG register to buffers.
…
…
POP
; Load ACC and PFLAG register from buffers.
RETI
; End of interrupt service routine
…
START:
; The head of user program.
…
; User program
…
JMP
START
; End of user program
…
ENDP
; End of program

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 14 Version 0.9
Example: Defining Interrupt Vector. The interrupt service routine is following user program.
.CODE
ORG
0
; 0000H
JMP
START
; Jump to user program address.
…
ORG
8
; Interrupt vector.
JMP
MY_IRQ
; 0008H, Jump to interrupt service routine address.
ORG
10H
START:
; 0010H, The head of user program.
…
; User program.
…
…
JMP
START
; End of user program.
…
MY_IRQ:
;The head of interrupt service routine.
PUSH
; Save ACC and PFLAG register to buffers.
…
…
POP
; Load ACC and PFLAG register from buffers.
RETI
; End of interrupt service routine.
…
ENDP
; End of program.
Note: It is easy to understand the rules of SONIX program from demo programs given above. These
points are as following:
1. The address 0000H is a “JMP”instruction to make the program starts from the beginning.
2. The address 0008H is interrupt vector.
3. User’s program is a loop routine for main purpose application.

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 15 Version 0.9
2.1.3 LOOK-UP TABLE DESCRIPTION
In the ROM’s data lookup function, Y register is pointed to middle byte address (bit 8~bit 15) and Z register is pointed
to low byte address (bit 0~bit 7) of ROM. After MOVC instruction executed, the low-byte data will be stored in ACC and
high-byte data stored in R register.
Example: To look up the ROM data located “TABLE1”.
B0MOV
Y, #TABLE1$M
; To set lookup table1’s middle address
B0MOV
Z, #TABLE1$L
; To set lookup table1’s low address.
MOVC
; To lookup data, R = 00H, ACC = 35H
; Increment the index address for next address.
INCMS
Z
; Z+1
JMP
@F
; Z is not overflow.
INCMS
Y
; Z overflow (FFH 00), Y=Y+1
NOP
;
;
@@:
MOVC
; To lookup data, R = 51H, ACC = 05H.
…
;
TABLE1:
DW
0035H
; To define a word (16 bits) data.
DW
5105H
DW
2012H
…
Note: The Y register will not increase automatically when Z register crosses boundary from 0xFF to
0x00. Therefore, user must be take care such situation to avoid look-up table errors. If Z register is
overflow, Y register must be added one. The following INC_YZ macro shows a simple method to process
Y and Z registers automatically.
Example: INC_YZ macro.
INC_YZ
MACRO
INCMS
Z
; Z+1
JMP
@F
; Not overflow
INCMS
Y
; Y+1
NOP
; Not overflow
@@:
ENDM

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 16 Version 0.9
Example: Modify above example by “INC_YZ”macro.
B0MOV
Y, #TABLE1$M
; To set lookup table1’s middle address
B0MOV
Z, #TABLE1$L
; To set lookup table1’s low address.
MOVC
; To lookup data, R = 00H, ACC = 35H
INC_YZ
; Increment the index address for next address.
;
@@:
MOVC
; To lookup data, R = 51H, ACC = 05H.
…
;
TABLE1:
DW
0035H
; To define a word (16 bits) data.
DW
5105H
DW
2012H
…
The other example of look-up table is to add Y or Z index register by accumulator. Please be careful if “carry” happen.
Example: Increase Y and Z register by B0ADD/ADD instruction.
B0MOV
Y, #TABLE1$M
; To set lookup table’s middle address.
B0MOV
Z, #TABLE1$L
; To set lookup table’s low address.
B0MOV
A, BUF
; Z = Z + BUF.
B0ADD
Z, A
B0BTS1
FC
; Check the carry flag.
JMP
GETDATA
; FC = 0
INCMS
Y
; FC = 1. Y+1.
NOP
GETDATA:
;
MOVC
; To lookup data. If BUF = 0, data is 0x0035
; If BUF = 1, data is 0x5105
; If BUF = 2, data is 0x2012
…
TABLE1:
DW
0035H
; To define a word (16 bits) data.
DW
5105H
DW
2012H
…

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 17 Version 0.9
2.1.4 JUMP TABLE DESCRIPTION
The jump table operation is one of multi-address jumping function. Add low-byte program counter (PCL) and ACC
value to get one new PCL. If PCL is overflow after PCL+ACC, PCH adds one automatically. The new program counter
(PC) points to a series jump instructions as a listing table. It is easy to make a multi-jump program depends on the
value of the accumulator (A).
Note: PCH only support PC up counting result and doesn’t support PC down counting. When PCL is
carry after PCL+ACC, PCH adds one automatically. If PCL borrow after PCL–ACC, PCH keeps value and
not change.
Example: Jump table.
ORG
0X0100
; The jump table is from the head of the ROM boundary
B0ADD
PCL, A
; PCL = PCL + ACC, PCH + 1 when PCL overflow occurs.
JMP
A0POINT
; ACC = 0, jump to A0POINT
JMP
A1POINT
; ACC = 1, jump to A1POINT
JMP
A2POINT
; ACC = 2, jump to A2POINT
JMP
A3POINT
; ACC = 3, jump to A3POINT
SONIX provides a macro for safe jump table function. This macro will check the ROM boundary and move the jump
table to the right position automatically. The side effect of this macro maybe wastes some ROM size.
Example: If “jump table” crosses over ROM boundary will cause errors.
@JMP_A
MACRO
VAL
IF
(($+1) !& 0XFF00) !!= (($+(VAL)) !& 0XFF00)
JMP
($ | 0XFF)
ORG
($ | 0XFF)
ENDIF
B0ADD
PCL, A
ENDM
Note: “VAL”is the number of the jump table listing number.
Example: “@JMP_A”application in SONIX macro file called “MACRO3.H”.
B0MOV
A, BUF0
; “BUF0”is from 0 to 4.
@JMP_A
5
; The number of the jump table listing is five.
JMP
A0POINT
; ACC = 0, jump to A0POINT
JMP
A1POINT
; ACC = 1, jump to A1POINT
JMP
A2POINT
; ACC = 2, jump to A2POINT
JMP
A3POINT
; ACC = 3, jump to A3POINT
JMP
A4POINT
; ACC = 4, jump to A4POINT

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 18 Version 0.9
If the jump table position is across a ROM boundary (0x00FF~0x0100), the “@JMP_A”macro will adjust the jump table
routine begin from next RAM boundary (0x0100).
Example: “@JMP_A”operation.
; Before compiling program.
ROM address
B0MOV
A, BUF0
; “BUF0”is from 0 to 4.
@JMP_A
5
; The number of the jump table listing is five.
0X00FD
JMP
A0POINT
; ACC = 0, jump to A0POINT
0X00FE
JMP
A1POINT
; ACC = 1, jump to A1POINT
0X00FF
JMP
A2POINT
; ACC = 2, jump to A2POINT
0X0100
JMP
A3POINT
; ACC = 3, jump to A3POINT
0X0101
JMP
A4POINT
; ACC = 4, jump to A4POINT
; After compiling program.
ROM address
B0MOV
A, BUF0
; “BUF0”is from 0 to 4.
@JMP_A
5
; The number of the jump table listing is five.
0X0100
JMP
A0POINT
; ACC = 0, jump to A0POINT
0X0101
JMP
A1POINT
; ACC = 1, jump to A1POINT
0X0102
JMP
A2POINT
; ACC = 2, jump to A2POINT
0X0103
JMP
A3POINT
; ACC = 3, jump to A3POINT
0X0104
JMP
A4POINT
; ACC = 4, jump to A4POINT

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 19 Version 0.9
2.1.5 CHECKSUM CALCULATION
The last ROM address are reserved area. User should avoid these addresses (last address) when calculate the
Checksum value.
Example: The demo program shows how to calculated Checksum from 00H to the end of user’s code.
MOV
A,#END_USER_CODE$L
B0MOV
END_ADDR1, A
; Save low end address to end_addr1
MOV
A,#END_USER_CODE$M
B0MOV
END_ADDR2, A
; Save middle end address to end_addr2
CLR
Y
; Set Y to 00H
CLR
Z
; Set Z to 00H
@@:
MOVC
B0BSET
FC
; Clear C flag
ADD
DATA1, A
; Add A to Data1
MOV
A, R
ADC
DATA2, A
; Add R to Data2
JMP
END_CHECK
; Check if the YZ address = the end of code
AAA:
INCMS
Z
; Z=Z+1
JMP
@B
; If Z != 00H calculate to next address
JMP
Y_ADD_1
; If Z = 00H increase Y
END_CHECK:
MOV
A, END_ADDR1
CMPRS
A, Z
; Check if Z = low end address
JMP
AAA
; If Not jump to checksum calculate
MOV
A, END_ADDR2
CMPRS
A, Y
; If Yes, check if Y = middle end address
JMP
AAA
; If Not jump to checksum calculate
JMP
CHECKSUM_END
; If Yes checksum calculated is done.
Y_ADD_1:
INCMS
Y
; Increase Y
NOP
JMP
@B
; Jump to checksum calculate
CHECKSUM_END:
…
…
END_USER_CODE:
; Label of program end

SN8PC20
Remote Control 8-Bit Micro-Controller
SONiX TECHNOLOGY CO., LTD Page 20 Version 0.9
2.2 DATA MEMORY (RAM)
56 X 8-bit RAM
Address
RAM Location
BANK 0
000h
General Purpose Area
RAM Bank 0
“
“
“
037h
080h
System Register
080h~0FFh of Bank 0 store system
registers (128 bytes).
“
“
“
0FFh
End of Bank 0
Sonix provides “Bank 0”type instructions (e.g. b0mov, b0add, b0bts1, b0bset…) to control Bank 0 RAM directly.
2.2.1 SYSTEM REGISTER
2.2.1.1 SYSTEM REGISTER TABLE
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
8
L
H
R
Z
Y
-
PFLAG
-
-
-
-
-
-
-
-
-
9
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
A
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
B
-
-
-
-
-
-
-
-
P0M
-
-
-
-
-
-
PEDGE
C
P1W
P1M
-
-
-
P5M
-
-
INTRQ
INTEN
OSCM
-
WDTR
IRR
PCL
PCH
D
P0
P1
-
-
-
P5
-
-
T0M
T0C
IRM
IRC
-
-
-
STKP
E
P0UR
P1UR
-
-
-
P5UR
@HL
@YZ
IRD
-
-
-
-
-
-
-
F
-
-
-
-
-
-
-
-
STK3L
STK3H
STK2L
STK2H
STK1L
STK1H
STK0L
STK0H
2.2.1.2 SYSTEM REGISTER DESCRIPTION
H, L =
Working, @HL addressing register.
Y, Z =
Working, @YZ and ROM addressing register.
R =
Working register and ROM look-up data buffer.
PFLAG =
ROM page and special flag register.
PnM =
Port n input/output mode register.
PEDGE =
P0.0 edge direction register.
INTRQ =
Interrupt request register.
INTEN =
Interrupt enable register.
OSCM =
Oscillator mode register.
WDTR =
Watchdog timer clear register.
IRR =
IR counter auto-reload data buffer.
PCH, PCL =
Program counter.
Pn =
Port n data buffer.
T0M =
T0 mode register.
T0C =
T0 counting register.
IRM =
IR mode register.
IRC =
IR counting register.
STKP =
Stack pointer buffer.
PnUR =
Port n pull-up resister control register.
@HL =
RAM HL indirect addressing index pointer.
@YZ =
RAM YZ indirect addressing index pointer.
IRD =
IR duty control register.
STK0~STK3 =
Stack 0 ~ stack 3 buffer.