?? external interrupt.asm
字號(hào):
LED BIT P1.0
LEDBUF EQU 30H
ORG 00H
LJMP START
ORG 03H
LJMP INTERRUPT
START: CLR LEDBUF
CLR LED
MOV TCON,#01H ;外部中斷0下降沿觸發(fā)
MOV IE,#81H ;打開外部中斷允許位(EX0)
;及總中斷允許位(EA)
LJMP $ ;等待中斷
INTERRUPT:
PUSH PSW ;保護(hù)現(xiàn)場(chǎng)
CPL LEDBUF ;取反LED
MOV C,LEDBUF
MOV LED,C
POP PSW ;恢復(fù)現(xiàn)場(chǎng)
RETI
END
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