KEYR EQU P1.0//改下端口 忘记 p3口 是低还是高了
KEYL EQU P1.1
LED EQU P0
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
MOV TMOD,#01H
MOV TH0,#HIGH(65536-50000)
MOV TL0,#LOW(65536-50000)
SETB ET0
SETB EA
MOV A,#0FEH
MOV LED,A
MOV R2,#0
CLR 00H
LOOP:
CLR TR0
LOOPL:
JB KEYL,LOOPR
SETB TR0
RL A
MOV LED,A
JNB 00H,$
CLR 00H
SJMP LOOPL
LOOPR:
JB KEYR,LOOP
SETB TR0
RR A
MOV LED,A
JNB 00H,$
CLR 00H
SJMP LOOPR
T0ISR:
CLR TR0
MOV TH0,#HIGH(65536-50000)
MOV TL0,#LOW(65536-50000)
SETB TR0
INC R2
CJNE R2,#20,T0E
MOV R2,#0
SETB 00H
T0E:
RETI
END
追问灯不亮啊,而且按键一直按才有电平输出,能不能就按一下就可以