C51秒表仿真電路實驗

ID:3721 · 發(fā)表于 2016-5-29 15:46

#include <reg51.h>
char disNumber[10] = {0x40, 0x79, 0x24, 0x30, 0x19, 0x12, 0x2, 0x78, 0x0, 0x10};
char ONE = 0;
char TWO = 0;
char THERE = 0;
char FOUR = 0;
int count = 0;
void delay5ms(void) //誤差 0us
{
unsigned char a,b;
for(b=19;b>0;b--)
for(a=130;a>0;a--);
}
void delay950ms(void) //誤差 0us
{
unsigned char a,b,c;
for(c=227;c>0;c--)
for(b=246;b>0;b--)
for(a=7;a>0;a--);
}
void time1() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
count++;
if (count % 2 == 0)
FOUR++;
if (FOUR >= 10)
{
FOUR = 0;
THERE++;
}
if (THERE >= 10)
{
THERE = 0;
TWO++;
}
if (TWO >= 10)
{
TWO = 0;
ONE++;
}
}
int main(void)
{
int i = 0;
TMOD=0x01;//設(shè)置定時器0為工作方式1
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;//打開中斷總開關(guān)
ET0=1;//開定時器0中斷
TR0=1;//啟動定時器0
while (1)
{
P3 = 0;
P2 = 0X1;
P0 = disNumber[ONE];
delay5ms();
P2 = 0X2;
P0 = disNumber[TWO];
delay5ms();
i++;
P2 = 0X4;
P0 = disNumber[THERE];
delay5ms();
i++;
P2 = 0X8;
P0 = disNumber[FOUR];
delay5ms();
i++;
}
return 0;
}

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