基于STC89C52的數字頻率計仿真設計,通過片上資源，定時器計數器實現對外部方波的頻率計數，平臺protues7.1，內含仿真文件源碼和protues電路文件，原創分享
仿真原理圖如下（proteus仿真工程文件可到本帖附件中下載）
系統效果圖
單片機源程序如下:
- #include<reg52.h>
- #define uchar unsigned char
- #define uint unsigned int
- sbit RS = P2^0;
- sbit RW = P2^1;
- sbit EN = P2^2;
- sbit led = P3^6;
- uint jici=0,fre=0;
- uchar display_num[6];
- void delayms(uint z)
- {
- uint x,y;
- for(x=z;x>0;x--)
- for(y=110;y>0;y--);
- }
- void delay_20us()
- {
- uchar a ;
- for(a=0;a<500;a++);
- }
- int delay(unsigned char xms)
- {
- unsigned char i,j;
- for(i=xms;i>0;i--)
- for(j=110;j>0;j--);
- return 0;
- }
- int write_com(unsigned char com)
- {
- RS = 0;
- RW = 0;
- P0 = com;
- delay(5);
- EN = 1;
- delay(5);
- EN = 0;
- return 0;
- }
- int write_date(unsigned char date)
- {
- RS = 1;
- RW = 0;
- P0 = date;
- delay(5);
- EN = 1;
- delay(5);
- EN = 0;
- return 0;
- }
- void LCD1602_Write_String(uchar x,uchar y,uchar *s)
- {
- if (y == 0)
- {
- write_com(0x80 + x);
- }
- else
- {
- write_com(0xC0 + x);
- }
- while (*s != '\0')
- {
- write_date(*s++);
- delay(150);
- }
- }
- int init()//1602初始化
- {
- EN = 0;
- write_com(0X38);
- write_com(0X0C);
- write_com(0X06);
- write_com(0X01);
- return 0;
- }
- int main(void)
- {
- init();
- TMOD=0x51;//定時器1計數模式 定時器0定時模式 工作方式1
- TH0=(65536-46080)/256;//裝定時50ms初值
- TL0=(65536-46080)%256;
- TR0=1; //定時器0模式開啟
- ET0=1;// 定時器0中斷
- EA=1;//全局中斷開啟
- TH1=0;
- TL1=0;
- TR1=0;
- LCD1602_Write_String(0,0,"frequence:");
- while(1)
- {
- display_num[0] = fre / 100 + '0';//分位提取
- display_num[1] = fre % 100 /10+ '0';
- display_num[2] = fre % 10+ '0';
- display_num[3] = 'H';
- display_num[4] = 'z';
- display_num[5] = '\0';
- if(pinlv > 1000)
- LCD1602_Write_String(0,1,"flow!");//大于1000則超出提示
- else
- LCD1602_Write_String(0,1,display_num);//顯示頻率
- }
- }
- void timer0() interrupt 1//定時器0溢出中斷
- {
- jici++;
- TH0=(65536-46080)/256;;
- TL0=(65536-46080)%256;;
- if(jici == 20) //20次為1s
- {
- TR0=TR1=0;
- fre=TL1+TH1*256; //提取計數數值 計算為頻率
- TL1=TH1=0;
- led=~led;
- jici=0;
- TR0=TR1=1;
- }
- }
所有資料51hei提供下載:
51單片機數字頻率計仿真設計.rar
(425.16 KB, 下載次數: 103)
2020-1-10 13:47 上傳
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