显示红黄绿灯程序 RED EQU P2.0 DELAY: MOV R7.#10 YELLOW EQU P2. 4 DELO: MOV R6. #200 GREEN EQU P2. DELI: MOV R5 #250 DEL2 DJNz R5. DEL2 ORG 000OH DNZ R6. DELI MAIN: CLR RED DJNZ RZ DELO SETB YELLOW RET SETB GREEN ACALL DELAY END SETB RED CLR YELLOW SETB GREEN ACALL DELAY SETB RED SETB YELLOW CLR GREEN ACALL DELAY AJMP MAIN显示红黄绿灯程序 RED EQU P2.0 YELLOW EQU P2.4 GREEN EQU P2.7 ORG 0000H MAIN: CLR RED SETB YELLOW SETB GREEN ACALL DELAY SETB RED CLR YELLOW SETB GREEN ACALL DELAY SETB RED SETB YELLOW CLR GREEN ACALL DELAY AJMP MAIN DELAY: MOV R7, #10 DEL0: MOV R6, #200 DEL1: MOV R5, #250 DEL2: DJNZ R5, DEL2 DJNZ R6, DEL1 DJNZ R7, DEL0 RET END