单片机独立键盘.doc

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89C52单片机
用数码管的前两位显示一个十进制舒，变化范围是00~59，开始时显示00，每按下S2键一次，数值加1，每按下S3键，数值减1，每按下S4键，数值归零；按下S5键，定时器功能开始自动加1，再次按下S5键数值停止自动加1，保持原数值。
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit key1=P3^4;
sbit key2=P3^5;
sbit key3=P3^6;
sbit key4=P3^7;
sbit dula=P2^6;
sbit wela=P2^7;
uchar numt0,num,temp;
uchar code table[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,
0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,0x00,0x73};
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void display(uchar numdis)
{
uchar shi,ge;
shi=numdis/10;
ge=numdis%10;

dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delay(10);

dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delay(10);
}
void init()
{
TMOD=0x01;
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
EA=1;
ET0=1;
}
void keyscan()
{ TR0=temp;
if(key1==0)
{
delay(10);
if(key1==0)
{
num++;
if(num==60)
num=0;
while(!key1);
}
}
if(key2==0)
{
delay(10);
if(key2==0)
{
if(num==0)
num=60;
num--;
while(!key2);
}
}
if(key3==0)
{
delay(10);
if(key3==0)
{
num=0;
while(!key3);

}
}
if(key4==0)
{
delay(10);
if(key4==0)
{
while(!key4);
temp=~temp;
}
}
}
void main()
{
init();
while(1)
{
keyscan();
display(num);
}
}
void T0_time() interrupt 1
{
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
numt0++;
if(numt0==20)
{
numt0=0;
num++;
if(num==60)
num=0;
}
}
. .jz.