標(biāo)題: 蜂鳴器 [打印本頁(yè)]

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作者: yuzhihe    時(shí)間: 2015-6-17 13:36
標(biāo)題: 蜂鳴器
//#include<var.h>
#include<stc89.h>
#include<absacc.h>
unsigned char bdata a8010;
    sbit BEEP = a8010^4;
unsigned char TCNT;

void T0init(void)
{
    TMOD = 0x01;
    //   12/11.0592 == 1.085069us
    //   50000/1.085069 == 46080
    TH0=(65536-46080)/256;
    TL0=(65536-46080)%256;
    EA = ET0 = TR0 = 1; //啟動(dòng)定時(shí)器
//滅LED燈，停轉(zhuǎn)風(fēng)扇
    XBYTE[0x8007] = 0x10 + 0x20;
}

void main(void)
{
    TCNT=0;
    T0init();
    while(1)
    {
    }
}
void T0ISR(void) interrupt 1
{
    TH0=(65536-46080)/256;
    TL0=(65536-46080)%256;
    TCNT++;
    if(TCNT==20)
    {
        TCNT=0;
        BEEP = !BEEP;
        XBYTE[0x8010] = a8010;      //送出訊響信號(hào)
    }
}

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作者: HHHHHUO    時(shí)間: 2015-6-17 17:24
這個(gè)目的是什么

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作者: kaixinjiuhaoha    時(shí)間: 2015-6-17 19:44
看不太懂

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