利用兩個定時器 來實現 3位數碼管 同時顯示計時器， 即從0- 999范圍的計時

#include

//共陰極數碼管編碼范圍

unsigned char code table[10]={0x3f,0x6,0x5b,0x4f,0x66,0x6d,0x7d,0x7,0x7f,0xef };

unsigned char first=0;

unsigned char second=0;

unsigned char third=0;

unsigned int number=0;

unsigned char t=0;

void Delay()

{

unsigned char j;

unsigned char i;

for(i=10; i>0; i--)

for(j=110; j>0; j--);

}

void main()

{

TMOD=0x11; //設置兩個定時器T0,T1的工作方式: 使用16位寄存器的方式1

EA=1; //打開 全局中斷

ET0=1; // 打開定時器T0的中斷

ET1=1;

TR0=1; // 啟動定時器T0

TR1=1;

TH0=(65536-50000)%256;

TL0=(65536-50000)%256;

TH1=(65536-50000)%256;

TL1=(65536-50000)%256;

while(1)

{

if(t==20)

{

t=0;

number++;

first=number/100;

second=(number-first*100)/10;

third=(number-first*100)%10;

}

}

}

void TimerLED0() interrupt 1 using 1

{

TH0=(65536-50000)%256;

TL0=(65536-50000)%256;

t++;

}

void TimerLED1() interrupt 3 using 2

{

TH1=(65536-10000)%256;

TL1=(65536-10000)%256;

P2=0xfe;

P0=table[first];

Delay();

P2=0xfd;

P0=table[second];

Delay();

P2=0xfb;

P0=table[third];

Delay();

}