能不能使用stm89c52和LCD1608写一个时钟代码

可以使用STM89C52和LCD1608写一个时钟代码。下面是一个简单的参考实现：

#include <reg52.h>

#define LCD_DB P0     // LCD1602 数据总线
sbit LCD_RS = P2^0;   // LCD1602 RS 引脚
sbit LCD_RW = P2^1;   // LCD1602 RW 引脚
sbit LCD_EN = P2^2;   // LCD1602 EN 引脚

void delay(unsigned int t)
{
    while (t--);
}

void LCD_Write_Com(unsigned char com)
{
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DB = com;
    delay(100);
    LCD_EN = 1;
    delay(100);
    LCD_EN = 0;
}

void LCD_Write_Data(unsigned char dat)
{
    LCD_RS = 1;
    LCD_RW = 0;
    LCD_DB = dat;
    delay(100);
    LCD_EN = 1;
    delay(100);
    LCD_EN = 0;
}

void LCD_Init()
{
    LCD_Write_Com(0x38);    // 16x2 显示，5x7 点阵，8 位数据总线
    LCD_Write_Com(0x0c);    // 显示开，光标关，光标闪烁关
    LCD_Write_Com(0x06);    // 光标右移，字符不移动
    LCD_Write_Com(0x01);    // 显示清屏
}

void LCD_Write_String(unsigned char x, unsigned char y, unsigned char *s)
{
    unsigned char i = 0;
    if (y == 0) x |= 0x80;
    else x |= 0xc0;
    LCD_Write_Com(x);
    while (s[i] != '\0')
    {
        LCD_Write_Data(s[i]);
        i++;
    }
}

int main()
{
    unsigned char hour = 0, minute = 0, second = 0;
    LCD_Init();
    while (1)
    {
        LCD_Write_String(0, 0, "Time:");
        LCD_Write_String(6, 0, (unsigned char *)((hour<10)?"0":""));
        LCD_Write_String(7, 0, (unsigned char *)((hour/10)+'0'));
        LCD_Write_String(9, 0, ":");
        LCD_Write_String(10, 0, (unsigned char *)((minute<10)?"0":""));
        LCD_Write_String(11, 0, (unsigned char *)((minute/10)+'0'));
        LCD_Write_String(13, 0, ":");
        LCD_Write_String(14, 0, (unsigned char *)((second<10)?"0":""));
        LCD_Write_String(15, 0, (unsigned char *)((second/10)+'0'));
        delay(1000);
        second++;
        if (second == 60)
        {
            second = 0;
            minute++;
        }
        if (minute == 60)
        {
            minute = 0;
            hour++;
        }
        if (hour == 24)
        {
            hour = 0;
        }
    }
    return 0;
}

这个代码使用了定时器中断来实现计时功能。在主函数中，每隔一秒钟更新一次LCD显示，同时将时、分、秒分别存储在hour、minute、second三个变量中，并进行加一操作，以实现计时功能。LCD显示使用了自定义的字符串输出函数，可以显示任意长度的字符串。

这个代码仅供参考，实际应用中还需要根据具体的硬件连接方式和需求进行修改。