//本機晶振11.0592,采用stc89c51單片機,P3.2 P3.3兩個按鍵控制方波發生器的輸出頻率.
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit output=P1^7; //輸出點
sbit oneset=P3^2; //設置100HZ
sbit twoset=P3^3; //設置200HZ
uint number1=0; //定時器0高8位
uint number2=0; //定時器0低8位
void main()
{
TMOD=0x01;
TH0=0xee; //任意設定初值
TL0=0x0b;
EA=1;
ET0=1;
TR0=1;
while(1)
{
if(oneset==0) //鍵值判斷 oneset為100HZ 實際是100.027HZ略有誤差
{number1=0xee;
number2=0x0b;
}
if(twoset==0) //鍵值判斷 twoset為200HZ 實際是200.143HZ略有誤差
{
number1=0xf7;
number2=0x0b;
}
}
}
void init()interrupt 1
{
TH0=number1;
TL0=number2;
output=~output;
TR0=1;
}