LCD1602的显示问题（新手提问）

请问一下  为什么我在做LCD1602的显示实验时  输进去一个A字符  为什么显示的却是0?而且在写命令时0x80在最右边  不是在最左边?下面是我写的程序  请大神帮我看一下！
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit lcden=P2^7;
sbit lcdrs=P2^6;
sbit lcdrw=P2^5;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
  for(y=110;y>0;y--);
}
void write_com(uchar com)
{
lcdrs=0;
lcdrw=0;
lcden=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_data(uchar date)
{
lcdrs=1;
lcdrw=0;
lcden=0;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void init()
{
write_com(0x38);
delay(5);
write_com(0x0f);
delay(5);
write_com(0x06);
delay(5);
write_com(0x80);
delay(5);

}
void main()
{
init();
write_data('A');
while(1);
}