如何在51 单片机上用lcd1602显示时钟

要在51单片机上使用LCD1602显示时钟，需要进行以下步骤：

1.连接LCD1602和51单片机，包括数据线和控制线。

2.编写51单片机程序，包括初始化LCD1602和设置时钟的代码。

3.使用定时器中断来更新时钟的显示，可以设置定时器的时间间隔为1秒。

4.在LCD1602上显示时钟，可以使用LCD1602的显示功能和ASCII码表来实现。

以下是一个简单的示例代码：

#include <reg51.h>
#include <stdio.h>
#include <string.h>

#define LCD_RS P2_0
#define LCD_RW P2_1
#define LCD_EN P2_2
#define LCD_DATA P0

void delay(unsigned int t)
{
unsigned int i, j;
for (i = 0; i < t; i++)
for (j = 0; j < 125; j++);
}

void lcd_write_cmd(unsigned char cmd)
{
LCD_RS = 0;
LCD_RW = 0;
LCD_DATA = cmd;
LCD_EN = 1;
delay(1);
LCD_EN = 0;
}

void lcd_write_data(unsigned char dat)
{
LCD_RS = 1;
LCD_RW = 0;
LCD_DATA = dat;
LCD_EN = 1;
delay(1);
LCD_EN = 0;
}

void lcd_init()
{
lcd_write_cmd(0x38);
lcd_write_cmd(0x0c);
lcd_write_cmd(0x06);
lcd_write_cmd(0x01);
}

void lcd_display_time(unsigned char hour, unsigned char minute, unsigned char second)
{
char str[16];
sprintf(str, "%02d:%02d:%02d", hour, minute, second);
lcd_write_cmd(0x80);
for (int i = 0; i < strlen(str); i++)
lcd_write_data(str[i]);
}

void timer0_isr() interrupt 1
{
static unsigned char hour = 0, minute = 0, second = 0;
second++;
if (second >= 60)
{
second = 0;
minute++;
if (minute >= 60)
{
minute = 0;
hour++;
if (hour >= 24)
hour = 0;
}
}
lcd_display_time(hour, minute, second);
}

void main()
{
TMOD = 0x01;
TH0 = 0xfc;
TL0 = 0x67;
ET0 = 1;
EA = 1;
lcd_init();
while (1);
}