基于51单片机电子时钟的设计（含程序和仿真图）

#include<reg52.h> #define uchar unsigned char #define uint unsigned int #define KEY_IO P3 #define LCD_IO P0 sbit LCD_RS = P2^0; sbit LCD_RW = P2^1; sbit LCD_EN = P2^2; sbit SPK = P1^2; sbit LED = P2^4; bit new_s, modify = 0; char t0, sec = 50, min = 59, hour = 23; char code LCD_line1[] = "THE CLOCK"; char code LCD_line2[] = "Timer: 00:00:00 "; char Timer_buf[] = "23:59:50"; void delay(uint z) { uint x, y; for(x = z; x > 0; x--) for(y = 100; y > 0; y--); } void W_LCD_Com(uchar com) { LCD_RS = 0; LCD_IO = com; LCD_EN = 1; delay(5); LCD_EN = 0; } void W_LCD_Dat(uchar dat) { LCD_RS = 1; LCD_IO = dat; LCD_EN = 1; delay(5); LCD_EN = 0; } void W_LCD_STR(uchar *s) { while(*s) W_LCD_Dat(*s++); } void W_BUFF(void) { Timer_buf[7] = sec % 10 + 48; Timer_buf[6] = sec / 10 + 48; Timer_buf[4] = min % 10 + 48; Timer_buf[3] = min / 10 + 48; Timer_buf[1] = hour % 10 + 48;Timer_buf[0] = hour / 10 + 48; W_LCD_Com(0xc0 + 7); W_LCD_STR(Timer_buf); } uchar read_key(void) { uchar x1, x2; KEY_IO = 255; x1 = KEY_IO; if (x1 != 255) { delay(100); x2 = KEY_IO; if (x1 != x2) return 255; while(x2 != 255) x2 = KEY_IO; if (x1 == 0x7f) return 0; else if (x1 == 0xbf) return 1; else if (x1 == 0xdf) return 2; else if (x1 == 0xef) return 3; else if (x1 == 0xf7) return 4; } return 255; } void Init() { LCD_RW = 0; W_LCD_Com(0x38); delay(50); W_LCD_Com(0x0c); W_LCD_Com(0x06); W_LCD_Com(0x01); W_LCD_Com(0x80); W_LCD_STR(LCD_line1); W_LCD_Com(0xC0); W_LCD_STR(LCD_line2); TMOD = 0x01; TH0 = 0x4c; TR0 = 1; PT0 = 1; ET0 = 1; EA = 1; } void main() { uint i, j; uchar Key; Init(); while(1) { if (new_s) { new_s = 0; sec++; sec %= 60; if(!sec) { min++; min %= 60; if(!min) { hour++; hour %= 24;} } W_BUFF(); if (!sec && !min) { for (i = 0; i < 200; i++) { SPK = 0; for (j = 0; j < 100; j++); SPK = 1; for (j = 0; j < 100; j++); } } } Key = read_key(); switch(Key) { case 0: modify = 1; break; case 1: if(modify) {min++; min %= 60; W_BUFF(); break;} case 2: if(modify) {hour++; hour %= 24; W_BUFF(); break;} case 3: modify = 0; break; } } } void timer0(void) interrupt 1 { TH0 = 0x4c; t0++; t0 %= 20; if(t0 == 0) {new_s = 1; LED = ~LED;} if(modify) LED = 0; }