5．C語言源程序

#include AT89X52.H>

unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7,

0xef,0xdf,0xbf,0x7f};

unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,

0x6d,0x7d,0x07,0x7f,0x6f,0x00};

unsigned char dispbuf[8]={10,10,10,10,10,10,0,0};

unsigned char dispcount;

unsigned char getdata;

unsigned int temp;

unsigned char i;

sbit ST=P3^0;

sbit OE=P3^1;

sbit EOC=P3^2;

sbit CLK=P3^3;

sbit LED1=P3^6;

sbit LED2=P3^7;

sbit SPK=P3^5;

bit lowflag;

bit highflag;

unsigned int cnta;

unsigned int cntb;

bit alarmflag;

void main(void)

{

ST=0;

OE=0;

TMOD=0x12;

TH0=0x216;

TL0=0x216;

TH1=(65536-500)/256;

TL1=(65536-500)%256;

TR1=1;

TR0=1;

ET0=1;

ET1=1;

EA=1;

ST=1;

ST=0;

while(1)

{

if((lowflag==1) (highflag==0))

{

LED1=0;

LED2=1;

}

else if((highflag==1) (lowflag==0))

{

LED1=1;

LED2=0;

}

else

{

LED1=1;

LED2=1;

}

}

}

void t0(void) interrupt 1 using 0

{

CLK=~CLK;

}

void t1(void) interrupt 3 using 0

{

TH1=(65536-500)/256;

TL1=(65536-500)%256;

if(EOC==1)

{

OE=1;

getdata=P0;

OE=0;

temp=getdata*25;

temp=temp/64;

i=6;

dispbuf[0]=10;

dispbuf[1]=10;

dispbuf[2]=10;

dispbuf[3]=10;

dispbuf[4]=10;

dispbuf[5]=10;

dispbuf[6]=0;

dispbuf[7]=0;

while(temp/10)

{

dispbuf[i]=temp%10;

temp=temp/10;

i++;

}