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SN8P2602BP

8-Bit Micro-Controller

Sonix Technology Co., Ltd 

SN8P2602B

8-Bit Micro-Controller

2.1.1.2 INTERRUPT VECTOR (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.

’ Note: ”PUSH”, “POP” instructions save and load ACC/PFLAG without (NT0, NPD). PUSH/POP buffer is a

unique buffer and only one level.

¾ Example: Defining Interrupt Vector. The interrupt service routine is following ORG 8.

.CODE

ORG

JMP

…

0

START

; 0000H

; Jump to user program address.

ORG

8

PUSH

…

…

POP

RETI

…

; Interrupt vector.

; Save ACC and PFLAG register to buffers.

; Load ACC and PFLAG register from buffers.

; End of interrupt service routine

START:

…

…

JMP

…

START

; The head of user program.

; User program

; End of user program

ENDP

; End of program

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