我要把 sst29sf040当作 数据存储器 使用,89c52的WR接sst29sf040的WE端,89c52的RD接sst29sf040的OE端,单片机（89c52 )的P2.7口和它的CE端相连，P2.6--P2.0和它的A14--A8相连，P07--P00通过373与A7--A0相连，而sst29sf040的A18--A15接地
以下是我的程序:程序运行后发现外部地址0x0030上,没有写上数据0x20,用示波器检测各个管脚都有信号，但不知正确与否.
#define _SST_C_
#include "reg51.h"
#include "sst.h"
#include <intrins.h>
#include <absacc.h>
#define FALSE 0
#define TRUE 1
#define SECTOR_SIZE 128 /*Must be 128 bytes for 29EE020*/
#define SST_ID 0xBF
#define SST_29SF040 0X13
#define uchar unsigned char
#define uint unsigned int
void wait(uchar p,uchar q);
int Check_SST_29SF040();
void ByteProgram(uchar SrcByte,uint Dst);
int Erase_One_Sector(uint Dst);
uchar ByteRead(uint addr);
void main()
{
Erase_One_Sector(0);
// while(1)
//{
ByteProgram(0x20,0x0030);
ByteRead(0x0030);
// }
}
void ByteProgram(uchar data SrcByte,uint Dst)
{
XBYTE[0x0555] = 0xAA;
XBYTE[0x02AA] = 0x55;
XBYTE[0x0555] = 0xA0;
XBYTE[Dst] = SrcByte;
//Check_Toggle_Ready(Dst);
wait(1,9);//等待25us
}
int Check_SST_29SF040()
{
uchar SST_id1;
uchar SST_id2;
int ReturnStatus;
/* Issue the Software ID code to 29sf040*/
XBYTE[0x0555]= 0xAA;/* set up address to be 555h */
/* write data 0xAA to the address */
XBYTE[0x02AA]= 0x55;/* set up address to be 2AAh */
/* write data 0x55 to the address */
XBYTE[0x0555]= 0x90;
wait(61,74); /*delay 10ms*/
/*read the product ID from29sf040*/
/* set up address to be 0000h */
SST_id1 = XBYTE[0x0000] ; /* get first ID byte???????????????*/
SST_id2 = XBYTE[0x0001];/* set up address to be 0001h */
if ((SST_id1 ==SST_ID)&&(SST_id2 == SST_29SF040))
{
ReturnStatus = 0;
}
else
ReturnStatus = -1;
/* Issue the Soffware Product ID Exit code thus returning the 29EE020 */
/* to the read operating mode */
/* set up address to be 555h */
XBYTE[0x0555] = 0xAA; /* write data 0xAA to the address */
/* set up address to be 2AAh */
XBYTE[0x02AA] = 0x55; /* write data 0x55 to the address */
/* set up address to be 555h */
XBYTE[0x0555] =0xF0; /* write data 0xF0 to the address */
wait(61,74); /*delay 10ms*/
return(ReturnStatus);
}
int Erase_One_Sector(uint Dst)
{
/* Issue the Sector Erase command to 39SF040 */
XBYTE[0x0555] = 0xAA; /* set up address to be 555h */
/* write data 0xAA to the address */
XBYTE[0x02AA] = 0x55; /* set up address to be 2AAh */
/* write data 0x55 to the address */
XBYTE[0x0555] = 0x80; /* set up address to be 555h */
/* write data 0x80 to the address */
XBYTE[0x0555] = 0xAA; /* set up address to be 555h */
/* write data 0xAA to the address */
XBYTE[0x02AA] = 0x55; /* set up address to be 2AAh */
/* write data 0x55 to the address */
XBYTE[Dst] = 0x20; /* set up starting address to be erased */
/* write data 0x30 to the address */
wait(85,134); /* check DATABOOK for the most */
/* accurate value -- Tse */
}
uchar ByteRead(uint addr)
{
uchar GetData;
GetData = XBYTE[addr];
return(GetData);
}
void wait(uchar p,uchar q)
{
uchar i,j; //(2*j+3)*i+4
for (i=p;i>0;i--)
for (j=q;j>0;j--);
}
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