24CSM01-ESLASHP datasheet(15/63 Pages) MICROCHIP

15 / 63 page

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Preliminary

DS20006781B

-page 15

24CSM01

6.2

Page Write

A page write operation allows up to 256 bytes to be

written in the same write cycle, provided all bytes are in

the same physical page of the memory array (where

address bits A16 through A8 are the same). Partial

page writes of less than 256 bytes are also allowed.

A page write is initiated the same way as a byte write,

but the host does not send a Stop condition after the

first data byte is clocked in.

Instead, after the EEPROM acknowledges receipt of

the first data byte, the host can transmit up to

255 additional data bytes. The EEPROM will respond

with an ACK after each data byte is received.

Once all data to be written have been sent to the

device, the host must issue a Stop condition (see

Figure 6-2). When the Stop condition is received, an

internal write cycle will begin.

If an attempt is made to write to a write-protected

portion of the array, no data will be written and the

device will immediately accept a new command.

The lower eight bits of the word address are internally

incremented following the receipt of each data byte.

The higher-order address bits are not incremented and

retain the memory page location.

When the incremented word address reaches the page

boundary, the internal Address Pointer will roll over to

the beginning of the same page.

FIGURE 6-2:

PAGE 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 the addresses that are integer

multiples of [page size – 1]. If a page write

operation attempts to write across a

physical page boundary, the result is that

the data wrap 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.

SCL

SDA

MSb

ACK

from

Client

A2 A1 A16 00 A15 A14 A13 A12 A11 A10 A9 A8

ACK

from

Client

Word Address – Byte 0

Device Address Byte

912

ACK

from

Client

Word Address – Byte 1

Data Byte (n)

Data Byte (n+x), Max.

of 256 without Roll Over

A7 A6 A5 A4 A3 A2 A1 A0

D7 D6 D5 D4 D3 D2 D1 D0

00 D7 D6 D5 D4 D3 D2 D1 D0 0

ACK

from

Client

ACK

from

Client

Stop by

Host

Start by

Host

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