51单片机+数码管组成频率计显示电路+源代码+Proteus仿真电路

/*一个机器周期采样值为1,下一个机器周期采样为0,则计数器加1*/ /*外部事件的最高计数频率为晶振的1/24,故最高计数为0.9216M;*/ /*目前状态下只是显示0到9999HZ的频率*/ /*原创作者：陈永刚*/ /*优化整理：tiansir*/ /*测频率原理*/ /*定时器T0作为定时装置，编程设定定时1s，定时器T1对外部信号计数，每1S中对计数结果处理*/ #include<reg51.h> #include<absacc.h> #define SEG_Q XBYTE[0xfcec] #define SEG_B XBYTE[0xfced] #define SEG_S XBYTE[0xfcee] #define SEG_G XBYTE[0xfcef] //通用数码管显示函数，传入数据0～9999 void renew_disp(unsigned int number) { unsigned char code tab1[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; unsigned char temp,flag=0; if(number < 10000) { //千位数码管 temp = number/1000%10; if (temp) { SEG_Q = tab1[temp]; flag = 1; } else { SEG_Q = 0xff;//数码管熄灭 flag = 0; } //百位数码管 temp = number/100%10; if(flag | temp) { SEG_B = tab1[temp]; flag = 1; } else { SEG_B = 0xff;//数码管熄灭 flag = 0; } //十位数码管 temp = number/10%10; if(flag | temp) SEG_S = tab1[temp]; else SEG_S = 0xff;//数码管熄灭 //个位数码管 temp = number%10; SEG_G = tab1[temp]; } else { SEG_Q = 0xbf; SEG_B = 0xbf; SEG_S = 0xbf; SEG_G = 0xbf; } } //T0定时中断，晶振22.1184M void T0_int(void) interrupt 1 { static char counter=0; TH0=(65536-46063)/256; TL0=(65536-46063)%256; if(counter++==39) { counter=0; TR1=0; renew_disp(256*TH1+TL1); TH1=TL1=0; TR1=1; } } void main() { TMOD = 0x51;/*01010001 T1计数,T0定时*/ TH1 = 0; TL1 = 0; //晶振22.1184M TH0 = (65536-46063)/256;//定时25MS TL0 = (65536-46063)%256; TR0 = 1; //开定时器0 TR1 = 1; //启动计时器1 EA = 1; //开总中断 ET0 = 1; //开定时器0中断 while(1); //原地踏步，等待中断 }