基于单片机10Hz-50MHz频率计系统设计-学习分享

960基于单片机10Hz-50MHz频率计系统设计

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//10HZ-50MHZ

#include <reg52.h>
unsigned long int fre; 
unsigned char time;
unsigned int count;
unsigned int count1;
sbit   LCD_RS=P1^0;	  //片选信号 
sbit   LCD_RW=P1^1;	  //读写信号 
sbit   LCD_E=P1^2; 	  //使能信号 
#define LCD_DB  P0	//数据信号 
unsigned char character[10]={0};//在屏幕上显示的字符串 
unsigned char characterA[]={"Acquisition Done"};//在屏幕上显示的字符串 
unsigned char characterB[]={"Wait a Minute....."};//在屏幕上显示的字符串 
unsigned char character_1[]={"FRE= Hz"};
unsigned char FLAG = 0;  //是否分频选择标志
void LCD_init(void);//初始化函数   
void LCD_write_command(unsigned char command);//写指令函数	 
void LCD_write_data(unsigned char dat);//写数据函数	   
void LCD_disp_char(unsigned char x,unsigned char y,unsigned char dat);//在某个屏幕位置上显示一个字符,X（0-15),y(1-2)
void delay_n40us(unsigned int n);//延时函数
void timer_init();            //中断初始化函数  

//-----------------------------延时函数---------------------------
void delay_n40us(unsigned int n)		  //延时函数 
{
	unsigned int i;
	unsigned char j;            
	for(i=n;i>0;i--)
	for(j=0;j<2;j++);          
} 
void delay_1s()
{
	unsigned int i,j;
	for(i = 0;i<100;i++)
		for(j = 0;j<1000;j++);
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