掉电记忆程序

三：功能//基于mcs51-u的按键计数器（产品计数器，含掉电记忆）//功能：s1用于加计数，s2用于计数归零；s3用于减计数#include <reg51.h>unsigned int Count;//*************键盘子程序*************sbit pl= P3^6; //165锁存sbit clk_j=P3^7; //165时钟sbit Do= P3^5; //165串口数据unsigned char bdata key;sbit s1=key^0;sbit s2=key^1;sbit s3=key^2;sbit s4=key^3;sbit s5=key^4;sbit s6=key^5;sbit s7=key^6;sbit s8=key^7;Readkey(){unsigned char i;clk_j=0;pl=0;for(i=0;i<8;i++){key<<=1;key|=(bit)Do;clk_j=1;clk_j=0;}}//*************以上键盘子程序*************** //*************以下数码管显示子程序*********sbit dat=P1^0; //定义驱动74595的数据脚为p1.0 sbit clk=P1^1; //74595的时钟sbit lat=P1^2; //栓锁sbit gw=P1^3; //个位显示控制脚sbit sw=P1^4; //十位sbit bw=P3^3; //百位sbit qw=P3^4; //千位//------字表------------------------------unsigned char code tab[]={ 0x3F,0x06,0x5B,0x4F, //"0","1","2","3"0x66,0x6D,0x7D,0x07, //"4","5","6","7"0x7F,0x6F,0x77,0x7c, //"8","9","A","B"0x39,0x5e,0x79,0x71, //"C","D","E","F"} ;//------显示延时--------------------------ds1ms(){unsigned char d;for(d=0;d<250;d++);}//------74HC595段输出循环------------------------- dsout(unsigned char j){unsigned char i;for(i=0;i<8;i++){dat=j&0x80; //提取高位clk=1;clk=0;j<<=1;lat=0; //锁存}//----74HC595位输出循环--------------------display(unsigned char sjqw,sjbw,sjsw,sjgw){dsout(tab[sjgw]); //查表得到数据段码送显示gw=0;ds1ms();gw=1;dsout(tab[sjsw]);sw=0;ds1ms();sw=1;dsout(tab[sjbw]);bw=0;ds1ms();bw=1;dsout(tab[sjqw]);qw=0;ds1ms();qw=1;}//********************以上数码管显示子程序*******/**********以下2402读写子程序**************/sbit WP=P2^1; //写保护sbit SCL=P2^2; //2402 IO 口定义sbit SDA=P2^3;#define W_cmd 0xa0 //写指令#define R_cmd 0xa1 //读指令void Dely24(void){unsigned char i;for(i=0;i<6;i++);}//*************************************void Dely24_10ms(void){unsigned int i;for(i=0;i<500;i++);//***************24x02开始程序********************** void star24(void){ Dely24();SDA=0;Dely24();SCL=0;Dely24();}//***************24停止程序*********************** void stop24(void){ Dely24();SCL=1;Dely24();SDA=1;Dely24();}//********************************unsigned char ReadByte(void){unsigned char i,j;for(i=0;i<8;i++) //循环读8位{SDA=1; //置高，不影响后续读取Dely24();SCL=1;Dely24();j<<=1;j|=(bit)SDA; //读1位Dely24();SCL=0;Dely24();}SDA=0;return(j);}//***********************************void SendByte(unsigned char SendDat){unsigned char i,j;for(i=0;i<8;i++) //循环8次{j=SendDat;SDA=j&0x80; //送出1位Dely24();SCL=1;Dely24();SendDat<<=1; //为下一位做准备}SDA=1;Dely24();SCL=1;Dely24();while(SDA==1); //等待应答SCL=0;Dely24();SDA=0;Dely24();}//****写一字节*********************************void WriIIC(unsigned char Wcmd,add,dat){SDA=1;SCL=1;Dely24();star24(); //开始SendByte(Wcmd); //命令SendByte(add); //地址SendByte(dat); //数据stop24();Dely24_10ms();}//****读一字节************************************ unsigned char ReadIIC(unsigned char Wcmd,add,Rcmd){unsigned char i;SDA=1;SCL=1;Dely24();star24(); //开始SendByte(Wcmd); //命令SendByte(add); //地址SDA=1;SCL=1;star24();SendByte(Rcmd); //读取i=ReadByte();stop24();return(i);}//***************以上24读写子程序*******************//***********开关延时***********void delay10ms(void){unsigned char i,j;for(i=20;i>0;i--)for(j=248;j>0;j--);}//*************************************************void main(void){WP=1;Count=0;Count=ReadIIC(W_cmd,0x00,R_cmd)+ReadIIC(W_cmd,0x01,R_cmd)*256; // 读0x00，0X01地址数据送Countwhile(1){Readkey();display(Count/1000,Count%1000/100,Count%1000%100/10,Count%10);if(s1==0){delay10ms();if(s1==0) //加计数程序{Count++;if(Count==10000){Count=0;}delay10ms();WP=0; // 允许写。

WriIIC(W_cmd,0x00,Count%256);delay10ms();WriIIC(W_cmd,0x01,Count/256);delay10ms();WP=1;while(s1==0)Readkey();display(Count/1000,Count%1000/100,Count%1000%100/10,Count%10);}}}if(s2==0) //归零程序{Count=0;WP=0;WriIIC(W_cmd,0x00,0);delay10ms();WriIIC(W_cmd,0x01,0);delay10ms();WP=1;}if(s3==0) //减计数程序{delay10ms();if(s3==0){Count--;if(Count>=10000){Count=0;}delay10ms();WP=0;WriIIC(W_cmd,0x00,Count%256);delay10ms();WriIIC(W_cmd,0x01,Count/256);delay10ms();WP=1;while(s3==0){Readkey();display(Count/1000,Count%1000/100,Count%1000%100/10,Count%10);}}}}}。