SN8P1602AX datasheet(20/94 Pages) SONIX

20 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 20

Revision 1.94

GENERAL PURPOSE PROGRAM MEMORY AREA

The 1017/4089-word at ROM locations 0009H~03FEH/0FFEH are used as general-purpose memory. The area is

stored instruction’s op-code and look-up table data. The SN8P1600 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 of ROM then 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+1

JMP

; Not overflow

INCMS

; Z overflow (FFH

00),

Y=Y+1

NOP

; Not overflow

;

@@:

MOVC

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

;

TABLE1:

0035H

; To define a word (16 bits) data.

5105H

; “

2012H

; “

CAUSION: The Y register can't increase automatically if Z register cross boundary from 0xFF to 0x00.

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

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 support more larger program memory addressing

capability. So make sure X register is “0” to avoid unpredicted error in loop-up table operation.

Example: INC_YZ Macro

INC_YZ

MACRO

INCMS

; Z+1

JMP

; Not overflow

INCMS

; Y+1

NOP

; Not overflow

@@:

ENDM

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