掉电可保存时钟

#include <reg52.h> #include "i2c.h" #include "delay.h" #include "1602.h" //?????,?????????,??????????????? #include<intrins.h> sbit RS = P2^4; //???? sbit RW = P2^5; sbit EN = P2^6; sbit spk = P1^2; #define RS_CLR RS=0 #define RS_SET RS=1 #define RW_CLR RW=0 #define RW_SET RW=1 #define EN_CLR EN=0 #define EN_SET EN=1 #define DataPort P0 unsigned char shi,fen,miao,tt; unsigned char table[]="CLOCK !"; unsigned char table1[]="00:00:00"; sbit key1=P3^7; sbit key2=P3^6; sbit key3=P3^5; sbit key4=P3^4; sbit key5=P3^3; void DelayUs2x(unsigned char t) { while(--t); } void DelayMs(unsigned char t) { while(t--); { //????1mS DelayUs2x(245); DelayUs2x(245); } } void delay(unsigned int t) { unsigned char j,k; for(j = 0; j < 255; j++) for(k = 0; k < t; k++) ; } bit LCD_Check_Busy(void) { DataPort= 0xFF; RS_CLR; RW_SET; EN_CLR; _nop_(); EN_SET; return (bit)(DataPort & 0x80); } void LCD_Write_Com(unsigned char com) { // while(LCD_Check_Busy()); //???? DelayMs(5); RS_CLR; RW_CLR; EN_SET; DataPort= com; _nop_(); EN_CLR; } void LCD_Write_Data(unsigned char Data) { //while(LCD_Check_Busy()); //???? DelayMs(5); RS_SET; RW_CLR; EN_SET; DataPort= Data; _nop_(); EN_CLR; } void LCD_Clear(void) { LCD_Write_Com(0x01); DelayMs(5); } void LCD_Init(void) { unsigned char i; LCD_Write_Com(0x38); /*??????*/ DelayMs(5); LCD_Write_Com(0x38); DelayMs(5); LCD_Write_Com(0x38); DelayMs(5); LCD_Write_Com(0x38); LCD_Write_Com(0x08); /*????*/ LCD_Write_Com(0x01); /*????*/ LCD_Write_Com(0x06); /*????????*/ DelayMs(5); LCD_Write_Com(0x0C); /*????????*/ shi=0; fen=0; miao=0; key1=1; key2=1; key3=1; key4=1; key5=1; LCD_Write_Com(0x80+5); for(i=0;i<7;i++) { LCD_Write_Data(table[i]); } LCD_Write_Com(0x80+0x44); for(i=0;i<8;i++) { LCD_Write_Data(table1[i]); } TMOD=0X01; TH0=(65536-50000)/256; TL0=(65536-50000)%256; EA=1; ET0=1; TR0=1; } void write_shifenmiao(unsigned char add,unsigned char Data) { unsigned char shi,ge; shi=Data/10; ge=Data%10; LCD_Write_Com(0x80+0x40+add); LCD_Write_Data(0x30+shi); LCD_Write_Data(0x30+ge); } void time0() interrupt 1 { TH0=(65536-50000)/256; TL0=(65536-50000)%256; tt++; if(tt==20) { tt=0; miao++; if(miao==60) { miao=0; fen++; if(fen==60) { spk = 1; delay(500); spk = 0; fen=0; shi++; if(shi==24) { shi=0; } write_shifenmiao(4,shi); } write_shifenmiao(7,fen); } write_shifenmiao(10,miao); } } void keyscan() { if(key1==0) { DelayMs(5); if(key1==0) { TR0=0; shi++; if(shi==24) { shi=0; } write_shifenmiao(4,shi); DelayMs(200); TR0=1; } } if(key2==0) { DelayMs(5); if(key2==0) { TR0=0; shi--; if(shi>24) { shi=23; } write_shifenmiao(4,shi); DelayMs(200); TR0=1; } } if(key3==0) { DelayMs(5); if(key3==0) { TR0=0; fen++; if(fen==60) { fen=0; } write_shifenmiao(7,fen); DelayMs(200); TR0=1; } } if(key4==0) { DelayMs(5); if(key4==0) { TR0=0; fen--; if(fen>24) { fen=59; } write_shifenmiao(7,fen); DelayMs(200); TR0=1; } } if(key5==0) { DelayMs(5); if(key5==0) { TR0=0; miao=0; write_shifenmiao(10,miao); DelayMs(200); TR0=1; } } } void main(void) { LCD_Init(); while (1) { keyscan(); } }