SN8P1602AS datasheet(17/94 Pages) SONIX

17 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 17

Revision 1.94

USER RESET VECTOR ADDRESS (0000H)

A 1-word vector address area is used to execute system reset. After power on reset or watchdog timer overflow reset,

then the chip will restart the program from address 0000h and all system registers will be set as default values. The

following example shows the way to define the reset vector in the program memory.

Example: After power on reset, external reset active or reset by watchdog timer overflow.

CHIP SN8P1602

ORG

; 0000H

JMP

START

; Jump to user program address.

; 0004H ~ 0007H are reserved

ORG

10H

START:

; 0010H, The head of user program.

; User program

ENDP

; End of program

INTERRUPT VECTOR ADDRESS (0008H)

A 1-word vector address area is used to execute interrupt request. If any interrupt service executes, the program

counter (PC) value is stored in stack buffer and jump to 0008h of program memory to execute the vectored interrupt.

Users have to define the interrupt vector. The following example shows the way to define the interrupt vector in the

program memory.

Example 1: This demo program includes interrupt service routine and the user program is behind the

interrupt service routine.

CHIP SN8P1602

.DATA

PFLAGBUF

.CODE

ORG

; 0000H

JMP

START

; Jump to user program address.

; 0004H ~ 0007H are reserved

ORG

; 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

START:

; The head of user program.

; User program

JMP

START

; End of user program

ENDP

; End of program

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