24CS512 datasheet(16/66 Pages) MICROCHIP

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24CS512

DS20005769C-page 16

 2018-2021 Microchip Technology Inc.

6.2

Page Write

A page write operation allows up to 128 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 A15 through A7 are the same). Partial

page writes of less than 128 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

127 additional data bytes. The EEPROM will respond

with an ACK after each data byte is received.

Once all data to be written has been sent to the device,

the host must issue a Stop condition (see Figure 6-2).

Once the Stop condition is received, an internal write

cycle will begin.

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

tion of the array, no data will be written and the device

will immediately accept a new command.

The lower seven 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 physi-

cal 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 there-

fore 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 A0

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 128 without Roll Qver

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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