C51课程列表
单片机入门必学的一些课程
计时器
#include <Reg52.h >
sbit key=P3^1;
char a[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
int n=0;
int cc = 0;
int T1MS = 65536-50000;
void disp_7seg(int num);
void delay(int i)
{
int x,y;
for(x=0;x < i;x++)
for(y=0;y<255;y++);
}
//void disp_time(int hour, int minite, int second)
void disp_7seg(int num)
{
P0 = 0x00;
P2=0xFF;//111(1 11)11
P0=a[num/1000];
delay(2);
P0 = 0x00;
P2=0xFB;//111(1 10)11
P0=a[num/100%10];
delay(2);
P0 = 0x00;
P2=0xF7;//111(1 01)11
P0=a[num/10%10];
delay(2);
P0 = 0x00;
P2=0xF3;//111(1 00)11
P0=a[num%10];
delay(2);
}
void init_interrupt();
void main()
{
init_interrupt();
while(1)
{
disp_7seg(n);
if(key==0)
{
delay(2);
if(key==0)
{
n=0;
}
}
while(key==0);
}
}
void init_interrupt()
{
TMOD = 0x00; //????
TL0 = T1MS%256; //??????
TH0 = T1MS/256; //??????
TR0= 1; //?????0
ET0 = 1; //????0
EA = 1; //???????
}
void T0_interrupt() interrupt 1
{
TL0 = T1MS%256; //??????
TH0 = T1MS/256; //??????
cc++;
if (cc>=80)
{
cc = 0;
n++;
}
}
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