LCD12864之前能正常显示，但一段时间后全屏显示“翱”字 -

//****************************************
//lcd12864写命令
//****************************************
void write_12864com(uchar com)
{
Busy();
rw=0;
rs=0;
delay_50us(1);
P0=com;
E=1;
delay_50us(10);
E=0;
delay_50us(2);
}
//****************************************
//lcd12864测忙
//****************************************
void Busy()
{
uchar busy;
do
{
E=0;
rs=0;
rw=1;
delay_50ms(1);
E=1;
busy=P0;
delay_50ms(1);
E=0;
}
while(busy&0x80);
}
//****************************************
//lcd12864写数据
//****************************************
void write_12864dat(uchar dat)
{
Busy();
rw=0;
rs=1;
E=0;
P0=dat;
delay_50us(1);
E=1;
delay_50us(10);
E=0;
delay_50us(2);
}
//****************************************
//lcd12864初始化
//****************************************
void initial_LCD()
{
RST=1;
delay_50ms(2);
write_12864com(0x30); //功能设置
delay_50us(4);
write_12864com(0x30); //再次设置
delay_50us(4);
write_12864com(0x0f); //显示设置，游标设置 0X0C
delay_50us(4);
write_12864com(0x01); //清屏
delay_50ms(1);
write_12864com(0x02);
delay_50us(10);
}
//****************************************
//lcd12864初始显示
//****************************************
void display_initial()
{
uchar i,j;
write_12864com(0x80); //LCD地址第一行
for(i=0;i<16;i++)
{
write_12864dat(table1[i]);
delay_50us(1);
}
write_12864com(0x88);//lcd地址第三行
for(j=0;j<16;j++)
{
write_12864dat(table2[j]);
delay_50us(1);
}
initial_LCD();
}
//****************************************
//lcd12864清屏
//****************************************
void display_clear()
{
write_12864com(0x01); //清屏
delay_50us(2);
}

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