51单片机计数器程序

ID:398085 · 发表于 2022-11-30 22:09

#include<reg51.h>
unsigned char code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char count;
int time_count;
sbit clk = P1^0;
sbit set = P3^4;
sbit start = P3^5;
char start_flag = 0;
void delay(unsigned int time)
{
unsigned int j = 0;
for(; time>0; time--)
for(j=0; j<125; j++);
}
key0() interrupt 0
{
delay(10);
count++;
if(count==20)
count=0;
}
void display_mode()
{
P2 = 0x00;
delay(500);
P2 = 0x3f;
delay(500);
}
void time_init()
{
TMOD=0x10; //工作于方式1
//0 0 方式0 13位计数器 TMOD=0x00
//0 1 方式1 16位计数器 TMOD=0x01
//1 0 方式2 自动重装8位计数器 TMOD=0x02
//1 1 方式3 T0分为2个8位独立计数器，T1为无中断重装8位计数器 TMOD=0x03
EA=1; // 中断允许
ET1=1; // 中断1打开
TH1=(65536-50000)/256; // (65536-50000)/256=60.6875
TL1=(65536-50000)%256;
// TR1=1;
}
void timer1(void) interrupt 3
{
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
time_count++;
if (time_count==20) //达到1s
{
time_count = 0;
clk = ~clk;
}
}
void main(void)
{
EA = 1;
EX0 = 1;
IT0 = 1;
time_init();
P0 = table[0];
P2 = table[0];
display_mode();
while(1)
{
if(set == 0)
{
delay(200);
if(set == 0)
{
count++;
if(count == 20)
count = 0;
}
}
if(start == 0)
{
delay(200);
if(start == 0)
{
if(start_flag == 0)
{
start_flag = 1;
TR1=1;
}
else if(start_flag == 1)
{
start_flag = 0;
TR1=0;
}
}
}
P0=table[count/10];
P2=table[count%10];
}
}

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