SN8F2250B Series
USB 2.0 Full-Speed 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.
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Example: Defining Interrupt Vector. The interrupt service routine is following ORG 8.
.CODE
ORG
JMP
…
0
; 0000H
START
; Jump to user program address.
ORG
PUSH
…
8
; Interrupt vector.
; Save ACC and PFLAG register to buffers.
…
POP
RETI
…
; Load ACC and PFLAG register from buffers.
; End of interrupt service routine
START:
; The head of user program.
; User program
…
…
JMP
…
START
; End of user program
; End of program
ENDP
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