用單片機實現(xiàn)對SST39VF040的操作

1、.AT89C51對SST 之FLASH的編程操作詳述Flash又名閃存，屬于EEPROM,即電可擦除可編程的存儲器。由于具有電可擦除的特性，并且其數(shù)據(jù)可保留上百年，所以它的應用范圍非常廣泛。非常適用于作為MicroChip以及DSP的外部程序存儲器，或者作為需要存儲大量數(shù)據(jù)的外部EEPROM。SST公司設計之39系列Multi-Purpose Flash，按照其存儲的空間主要分以下幾種：64K x8/128K x8/256K x8/512K x8 Byte，各自代表的芯片型號有： 39系列Flash之特性: SST39LF512/010/020/040工作電壓為3.0-3.6V； SST39V

2、F512/010/020/040工作電壓為2.7V3.6V；數(shù)據(jù)保留時間100年；工作電流典型值為10mA，待機電流為1uA；快速擦除芯片時間為70ms，字節(jié)編程時間為14us。對芯片有如下操作：chip Erase operation ；sector Erase operation ；byte program operation ；byte read operation ；write operation status detection 。通過軟件對芯片的操作可以訪問到SST 制造商的ID；以及芯片的ID，各芯片ID如下表： TABLE 1: PRODUCT IDENTIFICATIONAd

3、dressDataManufacturers ID0000HBFHDevice IDSST39LF/VF512SST39LF/VF010SST39LF/VF020SST39LF/VF0400001H0001H0001H0001HD4HD5HD6HD7H注意：當通過軟件訪問了Product Identification后，必須采用軟件命令退出該模式才能對芯片進行擦除、讀寫的操作.下面給出各軟件操作指令的時序圖：1. WE控制的字節(jié)編程時序：2.CE控制的字節(jié)編程時序圖：3. 編程操作的狀態(tài)檢測時序圖：4.WE控制的扇區(qū)擦除時序圖：5. WE控制的芯片擦除時序圖：6. 軟件訪問ID的時序圖：7.

4、退出軟件訪問ID&復位命令的時序圖：根據(jù)上面的時序圖，下面給出各種軟件指令操作的流程圖：1字節(jié)編程流程圖：2讀取ID流程圖：3復位命令流程圖： 4芯片擦除命令流程圖：5扇區(qū)擦除命令流程圖：下面以SST39VF040為列，給出AT89C51對其做編程動作的source code：SST39VF040地址線為A0A18，數(shù)據(jù)線為DQ0DQ7，片選線CE，數(shù)據(jù)寫使能線WE，數(shù)據(jù)讀使能線OE。#define uchar unsigned char#define uint unsigned int#define ulong unsigned longsfr DataOut=0x80; /定義P0口接SS

5、T39VF040的數(shù)據(jù)線sfr Address7_0=0x90; /定義P1口接SST39VF040的地址線 A0A7sfr Address15_8=0xa0; /定義P2口接SST39VF040的地址線A8A15sbit Address16=P32; /定義P3.2接SST39VF040的地址線A16sbit Address17=P33; /定義P3.3接SST39VF040的地址線A17sbit Address18=P34; /定義P3.4接SST39VF040的地址線A18sbit Sst39vf040_Ce=P35; /定義P3.5接SST39VF040的片選線線CEsbit Sst3

6、9vf040_We=P36; /定義P3.6接SST39VF040的寫使能線WE sbit Sst39vf040_Oe=P37; /定義P3.7接SST39VF040的讀使能線OE struct Flash uchar manufacturer_id; uchar device_id; ulong address; Sst39vf040;/讀FLASH ID的函數(shù)，入口參數(shù)：FLASH的manfacturer_ID，device_ID，出口參數(shù)返回1，0uchar Read_Id(uchar manfa_id,uchar devi_id) Sst39vf040_Ce=1; Sst39vf040

7、_We=1; Address7_0=0x55;Address15_8=0x55;Sst39vf040_Oe=1;Sst39vf040_Ce=0;Sst39vf040_We=0;DataOut=0xaa;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=0x90;Sst39v

8、f040_We=1;Sst39vf040_Ce=1;Delay10us();Address7_0=0x00;Address15_8=0x00;Sst39vf040_Ce=0;Sst39vf040_Oe=0;DataOut=0xff;Sst39vf040.manufacturer_id=DataOut;Address7_0=0x01;Delay10us();Sst39vf040.device_id=DataOut;Sst39vf040_Ce=1; if(Sst39vf040.manufacturer_id=manuf_ID)&(Sst39vf040.device_id=devi_ID) retu

9、rn 1;else return 0;/退出讀ID的狀態(tài)以及命令FLASH復位的函數(shù)void Read_Id_Exit(void) Sst39vf040_Ce=1; Sst39vf040_Oe=0; Sst39vf040_We=1; Address7_0=0x55; Address15_8=0x55; Sst39vf040_Ce=0; Sst39vf040_Oe=1; Sst39vf040_We=0; Delay10us(); DataOut=0xaa; Sst39vf040_We=1; Delay10us(); Address7_0=0xaa; Address15_8=0x2a; Delay

10、10us(); Sst39vf040_We=0; Delay10us(); DataOut=0x55; Sst39vf040_We=1; Delay10us(); Address7_0=0x55; Address15_8=0x55; Delay10us(); Sst39vf040_We=0; Delay10us(); DataOut=0xf0; Sst39vf040_We=1; Sst39vf040_Ce=1; Delay10us(); Sst39vf040_Ce=0;/芯片擦除函數(shù)void Chip_Erase(void) Sst39vf040_Ce=1; Sst39vf040_Oe=0;

11、Sst39vf040_We=1; Address18=0; Address17=0; Address16=0; Address7_0=0x55; Address15_8=0x55; Sst39vf040_Ce=0; Sst39vf040_Oe=1; 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; Addre

12、ss7_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=0x

13、55; Address15_8=0x55; Delay10us(); Sst39vf040_We=0; DataOut=0x10; Delay10us(); Sst39vf040_We=1; while(!Wait_Data_Pulling();/檢測FLASH編程，擦除操作過程中是否完成的函數(shù)，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;

14、Delay10us(); DataOut=0xff; outdata=DataOut; Sst39vf040_Ce=1; Sst39vf040_Oe=1; if(outdata&0x80)=0x80) return 1; else return 0; /字節(jié)編程函數(shù)，入口參數(shù)：( byte_address：AmsA0 = A18A0 ，待寫的數(shù)據(jù)：byte_data )， void We_Byte_Program(ulong byte_address,uchar byte_data) ulong temp_address; Sst39vf040_Ce=1; Sst39vf040_Oe=0; S

15、st39vf040_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(); Sst39vf040_We=0; DataOut=0x55; Delay10us(); Sst39vf040_We=1; Addres

16、s7_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) Address16=1; e

17、lse Address16=0; temp_address=byte_address; if(temp_address&0x020000)!=0) Address17=1; else Address17=0; temp_address=byte_address; if(temp_address&0x040000)!=0) Address18=1; else Address18=0; Delay10us(); Sst39vf040_We=0; DataOut=byte_data; Delay10us(); Sst39vf040_We=1; while(!Wait_Data_Pulling();/

18、字節(jié)讀函數(shù) 入口參數(shù)：待讀的字節(jié)地址byte_address，返回參數(shù)值：讀出的數(shù)據(jù)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 Address16=0; temp_address=byte_address; if(temp_address&0x00020000)!=0) Address17=1; else Address17=0; temp_address