SN8P1700
8-bit micro-controller build-in 12-bit ADC
ꢃExample 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
JMP
.
0
; 0000H
START
; Jump to user program address.
; 0001H ~ 0007H are reserved
ORG
JMP
08
MY_IRQ
; 0008H, Jump to interrupt service routine address
ORG
10H
START:
; 0010H, The head of user program.
.
; User program
.
.
.
; End of user program
JMP
START
MY_IRQ:
;The head of interrupt service routine
; B0XCH doesn’t change C, Z flag
; Push 80H ~ 87H system registers
B0XCH
A, ACCBUF
PUSH
.
.
.
; Pop 80H ~ 87H system registers
; End of interrupt service routine
; End of program
POP
B0XCH
RETI
A, ACCBUF
ENDP
ꢂ
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.
SONiX TECHNOLOGY CO., LTD
Page 27
Revision 1.94
SONIX [ SONIX TECHNOLOGY COMPANY ]
