SPI Flash Chip - Atmel(AT25F2048) Command List

Features

> 2Mbit High Speed SPI Serial Flash Memory. 2M (262,144 x 8)

> Serial Peripheral Interface (SPI) Compatible

> Supports SPI Modes 0 (0,0) and 3 (1,1)

> 33 MHz Clock Rate

> Byte Mode and 256-byte Page Mode for Program Operations

> Sector Architecture:

-        Four Sectors with 64K Bytes Each

-        256 Pages per Sector

> Product Identification Mode

> Low-voltage Operation

-        2.7 (Vcc = 2.7V to 3.6V)

> Sector Write Protection

-        Protect 1/4, 1/2 or Entire Array

> Write Protect (WP) Pin and Write Disable Instructions for both Hardware and Software Data Protection

> Self-timed Program Cycle (30 µs/Byte Typical)

> Self-timed Sector Erase Cycle (1 second/Sector Typical)

> Single Cycle Reprogramming (Erase and Program) for Status Register

> High Reliability

-        Endurance: 10,000 Write Cycles Typical

-        Data Retention: 20 Years

> 8-lead JEDEC SOIC

Command Listing

Command	Opcode	Operation
WREN	06h(0000 X110B)	Set Write Enable Latch
WRDI	04h(0000 X100B)	Reset Write Enable Latch
RDSR	05h(0000 X101B)	Read Status Register
WRSR	01h(0000 X001B)	Write Status Register
READ	03h(0000 X011B)	Read Data from Memory Array
PROGRAM	02h(0000 X010B)	Program Data Into Memory Array
SECTOR ERASE	52h(0101 X010B)	Erase One Sector in Memory Array
CHIP ERASE	62h(0110 X010B)	Erase All Sectors in Memory Array
RDID	15h(0001 X101B)	Read Manufacturer and Product ID

Status Register Format

Bit	7	6	5	4	3	2	1	0
	WPEN	X	X	X	BP1	BP0	WEN	/RDY

Read Status Register Bit Definition

Bit	Definition
Bit 0 (/RDY)	Bit 0 = 0 (RDY) indicates the device is READY. Bit 0 = 1 indicates the write cycle is in progress.
Bit 1 (WEN)	Bit 1 = 0 indicates the device is not WRITE ENABLED. Bit 1 = 1 indicates the device is WRITE ENABLED.
Bit 2 (BP0)	See Block Write Protect Bits Table.
Bit 3 (BP1)	See Block Write Protect Bits Table.
Bits 4-6 are 0s when device is not in an internal write cycle.
Bit 7 (WPEN)	See WPEN Operation Table.
Bits 0-7 are 1s during an internal write cycle.

Block Write Protect Bits Table

Level	Status Register Bits		AT25F2048
	BP1	BP0	Array Addresses Locked Out	Locked-out Sector(s)
0	0	0	None	None
1(1/4)	0	1	030000 - 03FFFF	Sector 4
2(1/2)	1	0	020000 - 03FFFF	Sector 3, 4
3(All)	1	1	000000 - 03FFFF	All sectors (1 - 4)

WPEN Operation Table

WPEN	WP	WEN	ProtectedBlocks	UnprotectedBlocks	Status Register
0	X	0	Protected	Protected	Protected
0	X	1	Protected	Writable	Writable
1	Low	0	Protected	Protected	Protected
1	Low	1	Protected	Writable	Protected
X	High	0	Protected	Protected	Protected
X	High	1	Protected	Writable	Writable

Address Key

Address	AT25F2048
An	A17 - A0
Don’t Care Bits	A23 - A18

Sector Addresses

Sector Address	AT25F2048 Sector
000000 to 00FFFF	Sector 1
010000 to 01FFFF	Sector 2
020000 to 02FFFF	Sector 3
030000 to 03FFFF	Sector 4

Manufacturer and Device ID Information

Byte No.	Data Type	Value
1	Manufacturer ID	1Fh
2	Device ID (Part 1)	63h