单片机实验：按键控制二极管发光

ORG 0000H
LJMP MAIN
ORG 0013H
LJMP EXINT1
ORG 0030H
MAIN:
SETB EA
SETB EX1
SETB IT1
MOV A,#07FH
LOOP:
RL A
        MOV P1,A
SJMP $
EXINT1:
RR A
        MOV P1,A
RETI
END   
      




ORG 0000H
LJMP MAIN
ORG 000BH 
LJMP EXT0
ORG 0030H
MAIN: