AT25F512A 데이터 시트보기 (PDF) - Atmel Corporation

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AT25F512A

512Kbit High Speed SPI Serial Flash Memory 512K (65,536 x 8)

Atmel Corporation 

Table 10. Address Key

Address

AT25F512A

AN

Don’t Care Bits

A15 – A0

A23 – A16

SECTOR ERASE (SECTOR ERASE): Before a byte can be reprogrammed, the sector

containing the byte must be erased. In order to erase the AT25F512A, two separate

instructions must be executed. First, the device must be write enabled via the WREN

instruction. Then the SECTOR ERASE instruction can be executed.

Table 11. Sector Addresses

Sector Address

000000 to 007FFF

008000 to 00FFFF

AT25F512A Sector

Sector 1

Sector 2

The Sector Erase instruction erases every byte in the selected sector if the device is not

locked out. Sector address is automatically determined if any address within the sector

is selected. The SECTOR ERASE instruction is internally controlled; it will automatically

be timed to completion. During this time, all commands will be ignored except RDSR

instruction. The AT25F512A will automatically return to the WRDI state at the comple-

tion of the sector erase cycle.

CHIP ERASE (CHIP ERASE): As an alternative to the Sector Erase, the Chip Erase

instruction will erase every byte in both sectors if the device is not locked out. First, the

device must be write enabled via the WREN instruction. Then the Chip Erase instruction

can be executed. The Chip Erase instruction is internally controlled; it will automatically

be timed to completion. The chip erase cycle time typically is 2 seconds. During the

internal erase cycle, all instructions will be ignored except RDSR. The AT25F512A will

automatically return to the WRDI state at the completion of the chip erase cycle.

10 AT25F512A

3345F–FLASH–11/06

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