DIANZHEN.zip_c51测频率

#include <AT89X52.H> #include "74HC595.H" #include "mod.h" sbit p1_2= P1^2; void display(unsigned int d);/*点阵显示*/ void sys_init();/*系统初始化*/ unsigned int num,num1,p; unsigned int t; void display(unsigned int d); //unsigned char code taba[]={0x9F,0xEF,0xEF,0x9F,0x6F,0x6F,0x6F,0x9F}; unsigned char code tabb[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};/*扫描*/ unsigned char tab[8]={0}; void delayms(unsigned int x) /*延时函数*/ { unsigned int i,j; for(i=x;i>0;i--) for(j=110;j>0;j--); } void main(void) { sys_init(); while(1) { display(t); TR1=1; TR0=1; } } void sys_init()/*系统初始化*/ { TMOD=0x51; TH0=0x4f; TL0=0xe5; TH1=0x00; TL1=0x00; ET0=1; ET1=1; IT1=1; EA=1; TR0=1; TR1=1; } void display(unsigned int d)/*点阵显示*/ { unsigned int shi,ge,i,j,h; shi=d%100/10; ge=d%100%10; for(i=0;i<8;i++) { tab[i]=talbe1[shi][i]&talbe2[ge][i]; } for(i=0;i<8;i++) { Ser_IN(tab[i]);// 列扫描 Ser_IN(tabb[i]);// 行送扫描数据 Par_OUT();//74HC595输出显示 } for(i=0;i<8;i++) { Ser_IN(0xff);// 列扫描 Ser_IN(0);// 行送扫描数据 Par_OUT();//74HC595输出显示 } } void zdfw_T0() interrupt 1 { TH0=0x4b;//?????T0?? TL0=0xfd; num++; if(num>=40) { TR0=0; TR1=0; t=(TL1+num1*256)/2; num=0; num1=0; TL1=0; TH1=0; } } void zdfw_T1() interrupt 3 { TH1=0;//初值 TL1=0;//计数器值 num1++; }