AT45DB021D_09 datasheet(9/54 Pages) ATMEL

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3638I–DFLASH–04/09

AT45DB021D

7.6

Sector Erase

The Sector Erase command can be used to individually erase any sector in the main memory.

There are 4 sectors and only one sector can be erased at one time. To perform sector 0a or sec-

tor 0b erase for the DataFlash standard page size (264 bytes), an opcode of 7CH must be

loaded into the device, followed by three address bytes comprised of 5 don’t care bits, 7 page

address bits (PA9 - PA3) and 12 don’t care bits. To perform a sector 1-7 erase, the opcode 7CH

must be loaded into the device, followed by three address bytes comprised of 5 don’t care bits, 3

page address bits (PA9 - PA7) and 16 don’t care bits. To perform sector 0a or sector 0b erase

for the binary page size (256 bytes), an opcode of 7CH must be loaded into the device, followed

by three address bytes comprised of 6 don’t care bits and 7 page address bits (A17 - A11) and

11 don’t care bits. To perform a sector 1-7 erase, the opcode 7CH must be loaded into the

device, followed by three address bytes comprised of 6 don’t care bit and 3 page address bits

(A17 - A15) and 16 don’t care bits. The page address bits are used to specify any valid address

location within the sector which is to be erased. When a low-to-high transition occurs on the CS

pin, the part will erase the selected sector. The erase operation is internally self-timed and

should take place in a maximum time of tSE. During this time, the status register will indicate that

the part is busy.

Table 7-1.

Block Erase Addressing

PA9/

A17

PA8/

A16

PA7/

A15

PA6/

A14

PA5/

A13

PA4/

A12

PA3/

A11

PA2/

A10

PA1/

PA0/

Block

0000000

0000001

0000010

0000011

•

1111100

124

1111101

125

1111110

126

1111111

127

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