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標題: 51單片機計數器清零 [打印本頁]

作者: dicksonlizx 時間: 2017-10-12 10:36
標題: 51單片機計數器清零
T0設為計數器，P2.0產生脈沖，計數到1000后清零計數值并關掉計數器，關不掉也不能清零，請高手指教//the purpose of the program is to verify the counter of T0 generated by P2.0,
//T0 is counter, T1 decided the serail port rate and T2 is timer

#include <reg52.h>
#include <lcd1602.h>
#include <serial.h>
#include <timer.h>
#define uint unsigned int
#define uchar unsigned char

uint rd_t0=0;
uint disp[4];
sbit pulse=P2^0;

void main()
{
uint i,j;
serial_init();
//timer0_init();
lcd1602_init();
while(1)
{
for(j=0;j<9;j++)
{
pulse=0;
delay10us(10);
pulse=1;
delay10us(10);
}
rd_t0=TH0*0x100+TL0;
disp[0]=rd_t0/10000;
disp[1]=(rd_t0-disp[0]*10000)/1000;
disp[2]=(rd_t0-disp[0]*10000-disp[1]*1000)/100;
disp[3]=(rd_t0-disp[0]*10000-disp[1]*1000-disp[2]*100)/10;
disp[4]=rd_t0-disp[0]*10000-disp[1]*1000-disp[2]*100-disp[3]*10;

if(rd_t0<1000)
{
for(i=0;i<5;i++)
{
senddatabyte(disp[i]+'0');
delay10us(10);
}
delay10us(6000);
//delay10us(60000);
sendcmdbyte(0x0c);
sendcmdbyte(0x01);
sendcmdbyte(0x06);
}

else
{
TMOD=0x27;
TR0=0;
TH0=0;
TL0=0;
rd_t0=0;
for(j=0;j<5;j++)
{
*(disp+j)=0;
}
//TR0=1;
//break;
}
}

}

作者: yzwzfyz 時間: 2017-10-13 00:45
TR0=1是起動，TR0=0就關閉了。

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