ORG 0000H

LJMP START

ORG 0030H

START: MOV SP,#5FH

MOV A,#0FEH

LOP: MOV P0,A

RL A

LCALL DELAY1S

SJMP LOP

DELAY1S:MOV R5,#19

DEL:MOV R6,#202

DEL1:MOV R7,#118

NOP

DJNZ R7,$

DJNZ R6,DEL1

DJNZ R5,DEL

RET

END

#include <reg52.h>

unsigned char time50ms_count,outdat;

void main()

{

time50ms_count=0;

outdat=0xfe;

TMOD=0x01;

TH0=0x4c;

TL0=0x00;

…… 此处隐藏0字 ……

EA=1;

ET0=1;

TR0=1;

while(1)

{

}

}

void time0() interrupt 1