SN8A1702AX datasheet(27/145 Pages) SONIX

27 / 145 page

SN8P1700

8-bit micro-controller build-in 12-bit ADC

SONiX TECHNOLOGY CO., LTD

Page 27

Revision 1.94

Example 2: The demo program includes interrupt service routine and the address of interrupt service

routine is in a special address of general-purpose area.

CHIP SN8P1708

ORG

; 0000H

JMP

START

; Jump to user program address.

; 0001H ~ 0007H are reserved

ORG

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

B0XCH

A, ACCBUF

; B0XCH doesn’t change C, Z flag

PUSH

; Push 80H ~ 87H system registers

POP

; Pop 80H ~ 87H system registers

B0XCH

A, ACCBUF

RETI

; End of interrupt service routine

ENDP

; End of program

Remark: It is easy to get 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 go to general-purpose ROM area. The

0004H~0007H are reserved. Users have to skip 0004H~0007H addresses. It is very important and

necessary.

2. The interrupt service starts from 0008H. Users can put the whole interrupt service routine from 0008H

(Example1) or to put a “JMP” instruction in 0008H then place the interrupt service routine in other

general-purpose ROM area (Example2) to get more modularized coding style.

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