c语言at89c52单片机与1602液晶显示器第一行显示200115009，第二行显示FENGJINFU。a:从屏幕右侧移入，遇到屏幕左侧停止；b:从屏幕左侧移入，遇到屏幕右侧停止；c：这二行内容居中；d：第一行靠左显示，第二行靠右显示。

对于第一个问题，你可以使用下面的代码来实现：

#include <reg52.h>
#include <stdio.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_Init()
{
    delay(50);
    LCD_RS = 0;
    LCD_RW = 0;
    LCD_DATA = 0x38;
    LCD_EN = 1;
    delay(5);
    LCD_EN = 0;
    delay(5);
    LCD_DATA = 0x0C;
    LCD_EN = 1;
    delay(5);
    LCD_EN = 0;
    delay(5);
    LCD_DATA = 0x01;
    LCD_EN = 1;
    delay(5);
    LCD_EN = 0;
    delay(5);
    LCD_DATA = 0x06;
    LCD_EN = 1;
    delay(5);
    LCD_EN = 0;
}

void LCD_Write(unsigned char dat, unsigned char rs)
{
    LCD_RS = rs;
    LCD_RW = 0;
    LCD_DATA = dat;
    LCD_EN = 1;
    delay(5);
    LCD_EN = 0;
}

void LCD_Clear()
{
    LCD_Write(0x01, 0);
}

void LCD_SetCursor(unsigned char x, unsigned char y)
{
    unsigned char addr;
    if (y == 0)
    {
        addr = 0x80 + x;
    }
    else
    {
        addr = 0xC0 + x;
    }
    LCD_Write(addr, 0);
}

void LCD_DisplayString(unsigned char x, unsigned char y, unsigned char *s)
{
    LCD_SetCursor(x, y);
    while (*s)
    {
        LCD_Write(*s++, 1);
    }
}

void LCD_DisplayStringRight(unsigned char x, unsigned char y, unsigned char *s)
{
    unsigned char len = 0;
    while (*s)
    {
        len++;
        s++;
    }
    LCD_SetCursor(x - len, y);
    while (*--s)
    {
        LCD_Write(*s, 1);
    }
}

void LCD_DisplayStringCenter(unsigned char y, unsigned char *s)
{
    unsigned char len = 0;
    unsigned char *p = s;
    while (*p)
    {
        len++;
        p++;
    }
    LCD_SetCursor((16 - len) / 2, y);
    while (*s)
    {
        LCD_Write(*s++, 1);
    }
}

void main()
{
    unsigned char str1[] = "200115009";
    unsigned char str2[] = "FENGJINFU";
    LCD_Init();
    LCD_DisplayString(0, 0, str1);
    LCD_DisplayStringCenter(1, str2);
    //LCD_DisplayStringRight(16, 1, str2); // Uncomment this line to display the second line on the right.
    while (1);
}

这个代码使用了AT89C52单片机和1602液晶显示器来显示两行文本。其中，`LCD_DisplayString`函数可以在指定的位置上显示一个字符串，`LCD_DisplayStringRight`函数可以在指定的位置上向右对齐显示一个字符串，`LCD_DisplayStringCenter`函数可以在指定的位置上居中显示一个字符串。你可以根据需要注释掉不需要的函数调用来实现你想要的效果。

注意：这个代码中使用的是汇编指令 `MOVX` 来访问外部RAM，因此需要在工程设置中打开 "Use Extended Instructions" 选项才能编译。