关于外部脉冲定时计数
时间:10-02
整理:3721RD
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#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar count,s;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void display(uchar temp);
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uchar shi,ge;
void main()
{
EX0=1;
IT0=1;
TMOD=0x01;
EA=1;
ET0=1;
TR0=1;
TH0=(65536-50000)/256; //设定定时器初值
TL0=(65536-50000)%256;
while(1)
{
display(count);
}
}
void zhongduan0()interrupt 0
{
count++;
if(s==1200)
{
EA=0;
TR0=0;
EX0=0;
}
}
void timer0()interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
s++;
}
void display(uchar temp)
{
uchar shi,ge;
shi=temp/10;
ge=temp%10;
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(5);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(5);
}
大家请看一下,这个程序为什么实现不了定时呢。
#define uchar unsigned char
#define uint unsigned int
uchar count,s;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void display(uchar temp);
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uchar shi,ge;
void main()
{
EX0=1;
IT0=1;
TMOD=0x01;
EA=1;
ET0=1;
TR0=1;
TH0=(65536-50000)/256; //设定定时器初值
TL0=(65536-50000)%256;
while(1)
{
display(count);
}
}
void zhongduan0()interrupt 0
{
count++;
if(s==1200)
{
EA=0;
TR0=0;
EX0=0;
}
}
void timer0()interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
s++;
}
void display(uchar temp)
{
uchar shi,ge;
shi=temp/10;
ge=temp%10;
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(5);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(5);
}
大家请看一下,这个程序为什么实现不了定时呢。
你想实现什么功能呢
你在中断里把 EA关闭了。
count还能++ 吗
你是想用外部触发启动定时器吗
好