单片机PO P1口控制16个LED 的跑马灯程序

#include <reg52h>

void time(unsigned int ucMs);//函数声明

void main(void)

{

unsigned char ucTimes;

#define DELAY_TIME 450

while(1)

{

P1=0xff;

P0=0xff;

for(ucTimes=0;ucTimes<8;ucTimes++){

P0 = P0 - (0x01<<ucTimes);time(DELAY_TIME);}

for(ucTimes=0;ucTimes<8;ucTimes++){

P1 = P1 - (0x01<<ucTimes);time(DELAY_TIME);}

P1=0xff;

P0=0xff;

for(ucTimes=0;ucTimes<8;ucTimes++){

P1 = P1 - (0x80>>ucTimes);time(DELAY_TIME);}

for(ucTimes=0;ucTimes<8;ucTimes++){

P0 = P0 - (0x80>>ucTimes);time(DELAY_TIME);}

}}

void time(unsigned int ucMs)

{

#define DELAYTIMES 239

unsigned char ucCounter;

while(ucMs!=0) {

for(ucCounter=0; ucCounter<DELAYTIMES; ucCounter++) { }

ucMs--;

}

}

#include<reg51h>

#define uchar unsigned char

uchar num=0;

void t0isr() interrupt 1

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

num++;

if(num>=20)

{

num=0;

P1=~P1;

}

}

main()

{

TMOD=0x01;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

TR0=1;

ET0=1;

EA=1;

P0=0xf0;

while(1);

}

//晶振12M

DSEG AT 30H

timetemp: DS 1

LED: DS 1

CSEG AT 00H

ORG 0000H

LJMP START

ORG 000BH

LJMP Timer0Interrupt

START:

MOV SP,#60H

MOV timetemp,#20

MOV P1，#0FFH;LED低电平点亮

LCALL InitTimer0

MOV LED,#0FEH

LOOP:

MOV P1,LED ;add your code here!

LJMP LOOP

InitTimer0:

MOV TMOD,#01H

MOV TH0,#HIGH(65536-50000)

MOV TL0,#LOW(65536-50000);延时50ms

SETB EA

SETB ET0

SETB TR0

RET

Timer0Interrupt:

PUSH ACC

PUSH PSW

CLR TR1

MOV A,TL1

ADD A,#LOW(65536-50000)+7

MOV TL1,A

CLR A

ADDC A,#HIGH(65536-50000)

SETB TR1

DJNZ timetemp,NEXTT1

MOV timetemp,#20

;========================

MOV A,LED

RL A

MOV LED,A;add your code here!

;========================

POP PSW

POP ACC

RETI

假设按键用P20，有上拉电阻，低电平有效；LED用高电平点亮

1、端口初始化

SETB P20

MOV P1,#0

2、检测按键变化，每按过一次，按键计数器KEYCOUNT就加1,

;查询按键是否按下

;若已按下，则等待按键d起，若未按下则等待按下

;按键未d起就一直等待，否则执行

inc keycount

3、将按键计数器的值送往P1口

mov a,keycount

mov P1,a

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