ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV SP,#5FH
LOOP:
MOV A,P2
MOV B,A
MOV P0,A
MOV P1,#0FFH
LOOP1:
LCALL DELAY
MOV C,P1.7
MOV A,P0
RLC A
MOV P0,A
MOV A,P1
RLC A
MOV P1,A
MOV A,P2
CJNE A,B,LOOP
SJMP LOOP1
DELAY:
MOV R2,#60
DELAY1:
MOV R3,#250
DJNZ R3,$
DJNZ R2,DELAY1
RET
END
程序2：
ORG 0000H
LJMP MAIN
ORG 0030H
MAIN:
MOV SP,#5FH
JNB P2.0,LOOP1 ;
JNB P2.1,LOOP2 ;
SJMP MAIN
LOOP1:
MOV P0,#0FEH
MOV P1,#0FFH
LOOP11:
MOV C,P1.7
MOV A,P0
RLC A
MOV P0,A
MOV A,P1
RLC A
MOV P1,A
JNB P2.1,LOOP2
SJMP LOOP11
LOOP2:
MOV P0,#0FCH
MOV P1,#0FFH
LOOP21:
MOV C,P1.7
MOV A,P0
RLC A
MOV P0,A
MOV A,P1
RLC A
MOV P1,A
JNB P2.0,LOOP1
SJMP LOOP21
DELAY:
MOV R2,#60
DELAY1:
MOV R3,#250
DJNZ R3,$
DJNZ R2,DELAY1
RET
END