急救!!!急需单片机51的十字路口程序答:程序经过调试,在89C52实验板上验证过的:ORG 0000H LJMP MAIN ;ORG 0003H ;LJMP INT0P ORG 000BH LJMP IT0P ORG 001BH LJMP IT1P MAIN: MOV TMOD,#11H MOV 20H,#0AH MOV 40H,#30H MOV 41H,#5H MOV 42H,#35H MOV 43H,#15H MOV R1,40H MOV R2,42H MOV R3,42H MOV R4,...