蜂鸣器报警显示实验.doc

实验六蜂鸣器报警显示实验一、实验内容一旦有报警信号产生,电路中蜂鸣器将鸣叫报警,同时旋转灯显示。二、;;,T1的使用方法;。三、实验电路及连线四、程序流程图开始延时定时器、中断初始化FRQ++主程序流程图开始启动定时器T0、T1初始化旋转灯NY中断取消关闭定时器T0、T1中断返回外部中断0中断服务程序流程图开始中断返回TH0=0xfeTL0=FRQSPK取反T0中断服务程序流程图开始中断返回TH1=(65536-45000)/256TL1=(65536-45000)%256P2循环移位T1中断服务程序流程图五、实验代码#include<>#include<>#defineuintunsignedint#defineucharunsignedcharsbitSPK=P3^7;ucharFRQ=0x00;voidDelayms(uintms){ uchari; while(ms--) { for(i=0;i<120;i++); }}voidmain(){ P2=0x00; TMOD=0x11; TH0=0x00; TL0=0xff; TH1=(65536-45000)/256; TL1=(65536-45000)%256; IT0=1; IE=0x8b; IP=0x01; TR0=0; TR1=0; while(1) { FRQ++; Delayms(1); }}voidEX0_INT()interrupt0{ TR0=!TR0; TR1=!TR1; if(P2==0x00) P2=0xe0; else P2=0x00;}voidT0_INT()interrupt1{ TH0=0xfe; TL0=FRQ; SPK=~SPK;}voidT1_INT()interrupt3{ TH1=(65536-45000)/256; TL1=(65536-45000)%256; P2=_crol_(P2,1);}六、实验现象及结果分析