C8051F12X操作FLASH存储器程序

DBMODE 为数据线的输入输出模式 为单片机的PXMDOUT
DBOUT 为输出模式
DBus 为数据端口 Px
/--------FLASH命令传送------//
void Comm_Latch_Cycle(uchar COMMAND)
{
uchar SFRPAGE_SAVE = SFRPAGE;
SFRPAGE = CONFIG_PAGE;
DBMODE = DBOUT;
ALE=0;
ALE=0;
CLE=1;
RE=1;
WE=1;
DBus=COMMAND; //WRITE COMMAND
WE=0;
WE=1;
CLE=0;
ALE=0;
SFRPAGE = SFRPAGE_SAVE;

}
//------------------ 传送地址------------------------------
void Add_Latch_Cycle(uint ADDR ) //传送地址，ADDR为页地址,从addr页第0字节开始
{
uchar SFRPAGE_SAVE = SFRPAGE;
SFRPAGE = CONFIG_PAGE; 
DBMODE= DBOUT; 
CLE=0;
ALE=1;
RE=1;
WE=1;
DBus=0; //A0-A7，column address
WE=0;
WE=1;
DBus=(uchar)ADDR; //A9-A16 ,Row Address page address A12-A29
WE=0;
WE=1;
DBus=(uchar)(ADDR>>8); //A17-A24,Row Address
WE=0;
WE=1; 
ALE=0;
CLE=0;
SFRPAGE = SFRPAGE_SAVE;
}
//读状态,状态正确时返回0，错误时返回1 
uchar Status_Read(void)
{ 
uchar Status;
Comm_Latch_Cycle(0x70);
Status=Read_Byte();
Status=Status & 0x01;
return Status; //status=0 erease ok else failled 
}
//从FLASH读一个字节
uchar Read_Byte(void) //read one byte from flash
{
uchar Rdata;
char SFRPAGE_SAVE = SFRPAGE; 
SFRPGCN=CONFIG_PAGE;
DBMODE = DBIN; //Data Bus input mode
DBus = 0xFF;
ALE =0;
CLE =0;
RE =1;
RE =0; 
Rdata =DBus;
RE=1; 
SFRPAGE = SFRPAGE_SAVE;
return(Rdata); 
}
//------------------Block Erease------------------------------
uchar Block_Erase(uint page_number) //
{ 
uchar SFRPAGE_SAVE = SFRPAGE;
SFRPAGE = CONFIG_PAGE; 
DBMODE= DBOUT;
Comm_Latch_Cycle(0x60);
ALE=1;
CLE=0;
DBus=(uchar)page_number; //A9-A16 
WE=0;
WE=1;
DBus=(uchar)(page_number>>8); //A17-A24
WE=0;
WE=1;
ALE=0;
CLE=0;
Comm_Latch_Cycle(0xD0); 
SFRPAGE = CONFIG_PAGE; 
RB = 1; 
while(!RB); 
SFRPAGE=SFRPAGE_SAVE;
return Status_Read(); //status =1,Bad Block; Status = 0, Erease OK
}