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請問利用51單片機(jī)怎么測100兆Hz的高頻方波，顯示在數(shù)碼管上，如圖是Proteus仿真和keil代碼，100khz還能測出來，到了1M10Mhz數(shù)碼管就不顯示了，請問為什么，怎么改才行，謝謝大佬們。- #include <REGX51.H>
- #include <intrins.h>
- unsigned long int count,count_end;
- unsigned int ans;
- unsigned char flag;
- unsigned char b[8];
- unsigned char duan[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
- unsigned char wei[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
- void Delay10us() //@12.000MHz
- {
- unsigned char i;
- _nop_();
- _nop_();
- i = 27;
- while (--i);
- }
- void delay(unsigned int ms) {
- unsigned int i, j;
- for (i = 0; i < ms; i++) {
- for (j = 0; j < 114; j++) {
- Delay10us();
- }
- }
- }
- void chushi(){
- TMOD=0x15; //1定時(shí)器 0計(jì)數(shù)器
- TH0=0;
- TL0=0;
- TH1=(65536-50000)/256;
- TL1=(65536-50000)%256;
- ET1=1;
- ET0=1;
- TR0=1;
- TR1=1;
- EA=1;
- }
- void main(){
- unsigned int k;
- P0=0xff;
- chushi();
- while(1){
- if(flag==1){
- for(k=0;k<8;k++){
- P2=wei[k];
- P0=duan[b[k]];
- Delay10us();
- }
- }
- }
- }
- void it_0() interrupt 1
- {
- TH0=0;
- TL0=0;
- count++;
- }
- void it_1() interrupt 3
- {
- ans++;
- TH1=(65536-50000)/256;
- TL1=(65536-50000)%256;
- if(ans==20){
- count_end=count*65536+((TH0 << 8) | TL0);
- b[0]=count_end/10000000; //10M
- b[1]=(count_end%10000000)/1000000;
- b[2]=(count_end%1000000)/100000;
- b[3]=(count_end%100000)/10000;
- b[4]=(count_end%10000)/1000;
- b[5]=(count_end%1000)/100;
- b[6]=(count_end%100)/10;
- b[7]=count_end%10;
- flag=1;
- TR0=0;
- TR1=0;
- }
- else{
- delay(10);
- }
- }
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2024-6-11 21:20 上傳
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