多中斷源識(shí)別電路

右圖為多中斷源識(shí)別電路，分別按下S1、S2、S3、S4在7段數(shù)碼管上分別顯示其編號(hào)1、2、3、4。

ORG 0000H

AJMP MAIN

ORG 0003H

AJMP INTT0

ORG 0030H

MAIN: MOV P1,#00H

SETB EA

SETB EX0

SETB IT0

AJMP $

INTT0: JB P1.0,NEXT1

JB P1.1,NEXT2

JB P1.2,NEXT3

JB P1.3,NEXT4

NEXT1: MOV P0,#0F9H

RETI

NEXT2: MOV P0,#0A4H

RETI

NEXT3: MOV P0,#0B0H

RETI

NEXT4: MOV P0,#99H

RETI

END