24LC21 datasheet(8/24 Pages) MICROCHIP

8 / 24 page

24LC21

DS21095J-page 8

 2004 Microchip Technology Inc.

It is required that VCLK be held at a logic high level in

order to program the device. This applies to byte write

and page write operation. Note that VCLK can go low

while the device is in its self-timed program operation

and not affect programming.

FIGURE 4-1:

BYTE WRITE

FIGURE 4-2:

BYTE WRITE

Note:

Page write operations are limited to writing

bytes within a single physical page,

regardless of the number of bytes

actually being written. Physical page

boundaries start at addresses that are

integer multiples of the page buffer size (or

‘page size’) and end at addresses that are

integer multiples of [page size - 1]. If a

page Write command attempts to write

across a physical page boundary, the

result is that the data wraps around to the

beginning of the current page (overwriting

data previously stored there), instead of

being written to the next page as might be

expected. It is therefore necessary for the

application software to prevent page write

operations that would attempt to cross a

page boundary.

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

Control

Byte

Word

Address

Data

VCLK

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

Control

Byte

Word

Address

Data

VCLK

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