七段顯示器二位

程式碼

//於七段顯示器顯示二位數計數


#include "reg51.h"
sbit x1=P3^0;
sbit x2=P1^0;

int a=2000,k=0; //0.5秒=2000*250us
int b,c;
unsigned char font[61] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x10,
0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x20,
0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x30,
0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x40,
0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x50,
0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x60};
char seg[6]={0x01,0x4f,0x12,0x06,0x4c,0x24};

int d, bcd[2];
unsigned char i;

main()
{

TMOD = 0x03;
TH0 = (256-250);
TL0 = (256-250);
TR0 = 1; //啟動計時器
IE = 0x82; //啟動Timer0中斷

bcd[0]=P1/10;
bcd[1]=P1%10;
d=bcd[0]*10+bcd[1];
x1=1;
while(1);

}




void scan_7seg() interrupt 1 //Timer0中斷程式(中斷向量1)
{ if (--a==0)
{
a=2000;

if (x1==0) //控制用
{

P0=seg[k++];
}



P2 = font[d--];

if (d==0)
while(1);
}

}
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