基于單片機(jī)的頻率計(jì)的設(shè)計(jì)(C51語(yǔ)言)

//用外部中斷一計(jì)數(shù),每中斷一次,count加一

//使用P1口接的八個(gè)發(fā)光二極管顯示

//本程序?yàn)橐粋€(gè)網(wǎng)友應(yīng)邀而寫,在硬件上測(cè)試通過(guò),在低頻率時(shí),效果不錯(cuò).

#include
unsignedint t1oc=20;//5000;
unsignedintcount=0,precount;
void display(unsigned int dis)
{
P1=dis;//顯示語(yǔ)句
}
void t1int() interrupt 3
{
TR1=0;
t1oc--;
TH1=0x4c;//72;//56;
TL1=0x00;//72;//56;
if(t1oc==0)
{
t1oc=20;//5000;
precount=count;
count=0;
}
TR1=1;
}
void int0int() interrupt 0
{

EX0=1;
count++;
EX0=0;
}
void main(void)
{
TMOD=0x10;//0x20;
TH1=0x4c;//72;//56;
TL1=0x00;//72;//56;
EA=1;
EX0=1;IT0=1;
ET1=1;
TR1=1;
while(1)
{
display(precount);
}
}