用单片机实现对SST39VF040的操作(3)

Address7_0=0xaa; Address15_8=0x2a; Delay10us(); Sst39vf040_We=0; DataOut=0x55; Delay10us(); Sst39vf040_We=1; Address7_0=0x55; Address15_8=0x55; Delay10us(); Sst39vf040_We=0; DataOut=0x80; Delay10us(); Sst39vf040_We=1; Delay10us(); Sst39vf040_We=0; DataOut=0xaa; Delay10us(); Sst39vf040_We=1; Address7_0=0xaa; Address15_8=0x2a; Delay10us(); Sst39vf040_We=0; DataOut=0x55; Delay10us(); Sst39vf040_We=1; Address7_0=0x55; Address15_8=0x55; Delay10us(); Sst39vf040_We=0; DataOut=0x10; Delay10us(); Sst39vf040_We=1;

while(!Wait_Data_Pulling()); }

//检测FLASH编程，擦除操作过程中是否完成的函数，完成后返回值1 uchar Wait_Data_Pulling(void) {

uchar outdata; Sst39vf040_Ce=1; Sst39vf040_We=1; Sst39vf040_Oe=1; Delay10us(); Sst39vf040_Ce=0; Sst39vf040_Oe=0; Delay10us(); DataOut=0xff; outdata=DataOut; Sst39vf040_Ce=1; Sst39vf040_Oe=1; if((outdata&0x80)==0x80) else }

//字节编程函数，入口参数：( byte_address：Ams~A0 = A18~A0 ，待写的数据：byte_data )， void We_Byte_Program(ulong byte_address,uchar byte_data) {

ulong temp_address; Sst39vf040_Ce=1; Sst39vf040_Oe=0; Sst39vf040_We=1; Address7_0=0x55; Address15_8=0x55; Address16=0; Address17=0; Address18=0; Sst39vf040_Ce=0; Sst39vf040_Oe=1; Sst39vf040_We=0; DataOut=0xaa; Delay10us(); Sst39vf040_We=1; Address7_0=0xaa; Address15_8=0x2a; Delay10us();

return 0; return 1;

Sst39vf040_We=0; DataOut=0x55; Delay10us(); Sst39vf040_We=1; Address7_0=0x55; Address15_8=0x55; Delay10us(); Sst39vf040_We=0; DataOut=0xa0; Delay10us(); Sst39vf040_We=1; temp_address=byte_address;

Address7_0=temp_address&0x0000ff; temp_address=byte_address;

Address15_8=(temp_address&0x00ff00)>>8; temp_address=byte_address; if((temp_address&0x010000)!=0)

else

Address16=0; Address16=1;

temp_address=byte_address; if((temp_address&0x020000)!=0)

else

Address17=0; Address17=1;

temp_address=byte_address; if((temp_address&0x040000)!=0)

else

Address18=0; Address18=1;

Delay10us(); Sst39vf040_We=0; DataOut=byte_data; Delay10us(); Sst39vf040_We=1;

while(!Wait_Data_Pulling()); }

//字节读函数 入口参数：待读的字节地址byte_address，返回参数值：读出的数据

uchar Byte_Read(ulong byte_address) {

ulong temp_address; uchar temp_data;

temp_address=byte_address; Sst39vf040_Ce=1; Sst39vf040_Oe=1; Sst39vf040_We=1;

Address7_0=temp_address&0x000000ff; temp_address=byte_address;

Address15_8=(temp_address&0x0000ff00)>>8; temp_address=byte_address;

if((temp_address&0x00010000)!=0)

Address16=1;

else }

以上给出了读写SST39VF040的C51源程式，其他几个型号的FLASH读写都可以调用这些函数，只要改变入口参数即可，读者可以灵活应用。

Address16=0;

temp_address=byte_address; if((temp_address&0x00020000)!=0) else

Address17=0; Address17=1;

temp_address=byte_address; if((temp_address&0x00040000)!=0) else

Address18=0; Address18=1;

Delay10us(); Sst39vf040_Ce=0; Sst39vf040_Oe=0; Delay10us(); DataOut=0xff; temp_data=DataOut; Sst39vf040_Ce=1; Sst39vf040_Oe=1; return temp_data;