计数器0~999

#include

#define uchar unsigned char #define uint unsigned int uint jishu;

uchar bai=0,shi=0,ge=0;

uchar code tab[]= {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82, 0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};

void chushi() {

jishu=0; TMOD=1; TR0=1; EA=1; ET0=1;

TH0=0x3c; TL0=0xb0;

}

void delay(uchar x) {

uchar y,z;

for(y=x;y>0;y--) for(z=120;z>0;z--); }

void display() {

P2=0xff; P0=tab[bai]; P2=0xfd; delay(1);

P2=0xff; P0=tab[shi]; P2=0xfb; delay(1);

P2=0xff; P0=tab[ge]; P2=0xf7; delay(1); }

void main() {

chushi(); //初始化函数 while(1) {

display(); //调用显示函数 //调用延时函数 } }

void timer() interrupt 1 //采用T0定时器工作方式1 {

TH0=0x3c; TL0=0xb0; jishu++;

if(jishu==20) { jishu=0; ge++; if(ge==10) { ge=0; shi++; if(shi==10) { shi=0; bai++; if(bai==10) { bai=0; } } } }

}