SN8P1602A datasheet(16/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 16

Version 1.1

Programming Tip: Defining Interrupt Vector (Example 2)

CHIP SN8P1602B

.DATA

PFLAGBUF

.CODE

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

B0MOV

A, PFLAG

B0MOV

PFLAGBUF, A

; Save PFLAG register in a buffer

B0MOV

A, PFLAGBUF

B0MOV

PFLAG, A

; Restore PFLAG register from buffer

B0XCH

A, ACCBUF

; B0XCH doesn’t change C, Z flag

RETI

; End of interrupt service routine

ENDP

; End of program

Remark: 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 0004H~0007H are reserved. Users is NOT allow to use 0004H~0007H addresses. The default

value might change from time to time during various production progress. We strongly suggest

users DO NOT take this value into the Check Sum. For detailed information, please check the

following Checksum Calculation section

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