单片机之定时器

这是一个对晶体管和LED进行定时的程序（秒表）

#include <reg52.h>

#include <intrins.h>

#define uchar unsigned char

#define uint unsigned int

sbit we = P2^7;

sbit du = P2^6;

sbit LED1 = P1^0;

uchar counter,time_counter;

uchar code leddata[]={

0x3F, //"0"

0x06, //"1"

0x5B, //"2"

0x4F, //"3"

0x66, //"4"

0x6D, //"5"

0x7D, //"6"

0x07, //"7"

0x7F, //"8"

0x6F, //"9"

0x77, //"A"

0x7C, //"B"

0x39, //"C"

0x5E, //"D"

0x79, //"E"

0x71, //"F"

0x76, //"H"

0x38, //"L"

0x37, //"n"

0x3E, //"u"

0x73, //"P"

0x5C, //"o"

0x40, //"-"

0x00, //熄灭

0x00 //自定义

};

void delay(uint z)

{

uint x,y;

for(x = z; x > 0; x--)

for(y = 114; y > 0 ; y--);

}

void display(uchar i)

{

uchar shi,ge;

shi = i / 10; //求模

ge = i % 10; //求余

P0 = 0xff;

we = 1;

P0 = 0xfe; //点亮第一位数码管

we = 0;

du = 1;

P0 = leddata[shi];

du = 0;

delay(1);

P0 = 0xff;

we = 1;

P0 = 0xfd;//点亮第二位数码管

we = 0;

du = 1;

P0 = leddata[ge];

du = 0;

delay(1);

}

void main()

{

TMOD = 0x01;//定时器0 工作模式1 16模式定时器

TH0 = (65536 - 46082)/256;

TL0 = (65536 - 46082)%256; //定时50ms

TR0 = 1;//启动定时器0

while(1)

{

if(TF0 == 1)

{

TF0 = 0;

TH0 = 0x4b;

TL0 = 0xfe; //定时50ms

counter++;

}

if(counter == 20)

{

counter = 0;

LED1 = ~LED1;

time_counter++;

}

if(time_counter == 60)

time_counter = 0;

display(time_counter);

}

}

程序运行晶体管变成一个秒表功能