/*
DU_12864(RAM_BF) 是12864液晶屏、串行、讀數(shù)據(jù)函數(shù).
RAM_BF=0、是讀忙標(biāo)志和地址.RAM_BF=1、是讀RAM數(shù)據(jù).
*/
unsigned char DU_12864(bit RAM_BF)
{
unsigned char i,ADD,data1,data2,data3;
if(RAM_BF==0)
ADD=0xfc;
if(RAM_BF==1)
ADD=0xfe;

CS_12864=1;
NOPx;
CLK_12864=0;
for(i=0; i<8; i++)
  {
   ADD =ADD<<1;
   SID_12864=CY;
   NOPx;        
   CLK_12864=1;
   NOPx;
   CLK_12864=0;
  }
for(i=0;i<8;i++)
  {

   CLK_12864=1;
      data1=data1<<1;
   if(SID_12864==1)
    {
     data1=data1 | 0x01;
     }
   NOPx;
   CLK_12864=0;
   }
for(i=0;i<8;i++)
  {

   CLK_12864=1;
      data2=data2<<1;
   if(SID_12864==1)
    {
     data2=data2 | 0x01;
     }
   NOPx;
   CLK_12864=0;
   }
NOPx;
CS_12864=0;
data1=data1&0xf0;
data2=data2&0xf0;
data2=data2>>4;
data3=data1+data2;
return data3;
}


讀數(shù)據(jù)要注意什么問題????