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SN8P1602B

8-Bit Micro-Controller

Sonix Technology Co., Ltd 

SN8P1602B

8-Bit Micro-Controller

GENERAL PURPOSE PROGRAM MEMORY AREA

The ROM location 0009H~03FEH are used as general-purpose memory. The area is to store both instruction’s

op-code and look-up table data. The SN8P1602B includes jump table function by using program counter (PC) and

look-up table function by using ROM code registers (R, Y, Z).

The boundary of program memory is separated by the high-byte program counter (PCH) every 100H. In jump table

function and look-up table function, the program counter can’t leap over the boundary by program counter

automatically. Users need to modify the PCH value to “PCH+1” when the PCL overflows (from 0FFH to 000H).

LOOK-UP TABLE DESCRIPTION

In the ROM’s data lookup function, Y register is pointed to the bit 8~bit 15 and Z register to the bit 0~bit 7 data of ROM

address. After MOVC instruction is 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”.

@@:

TABLE1:

B0MOV

B0MOV

MOVC

INCMS

JMP

INCMS

NOP

MOVC

.

DW

DW

DW

Y, #TABLE1$M

Z, #TABLE1$L

Z

@F

Y

.

0035H

5105H

2012H

; To set lookup table1’s middle address

; To set lookup table1’s low address.

; To lookup data, R = 00H, ACC = 35H

;

; Increment the index address for next address

; Z+1

; Not overflow

; Z overflow (FFH 00), Y=Y+1

;

;

; To lookup data, R = 51H, ACC = 05H.

;

; To define a word (16 bits) data.

;“

;“

CAUSION: The Y register will not increase automatically when Z register crosses boundary from 0xFF to

0x00. Therefore, user must take care such situation to avoid loop-up table errors. If Z register

overflows, Y register must be added one. The following INC_YZ macro shows a simple method to process

Y and Z registers automatically.

Note: Because the program counter (PC) is only 12-bit, the X register is useless in the application. Users

can omit “B0MOV X, #TABLE1$H”. SONiX ICE supports larger program memory addressing capability.

Please be sure that X register is “0” to avoid unpredicted error in loop-up table operation.

Example: INC_YZ Macro

INC_YZ

MACRO

INCMS

Z

JMP

@F

; Z+1

; Not overflow

@@:

INCMS

Y

NOP

ENDM

; Y+1

; Not overflow

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