M24C64-BN3P datasheet(10/26 Pages) STMICROELECTRONICS

10 / 26 page

M24C64, M24C32

10/26

Page Write

The Page Write mode allows up to 32 bytes to be

written in a single Write cycle, provided that they

are all located in the same ’row’ in the memory:

that is, the most significant memory address bits

(b12-b5 for M24C64, and b11-b5 for M24C32) are

the same. If more bytes are sent than will fit up to

the end of the row, a condition known as ‘roll-over’

occurs. This should be avoided, as data starts to

become overwritten in an implementation depen-

dent way.

The bus master sends from 1 to 32 bytes of data,

each of which is acknowledged by the device if

Write Control (WC) is Low. If Write Control (WC) is

High, the contents of the addressed memory loca-

tion are not modified, and each data byte is fol-

lowed by a NoAck. After each byte is transferred,

the internal byte address counter (the 5 least sig-

nificant address bits only) is incremented. The

transfer is terminated by the bus master generat-

ing a Stop condition.

Figure 8. Write Mode Sequences with WC=0 (data write enabled)

BYTE WRITE

DEV SEL

BYTE ADDR

DATA IN

PAGE WRITE

DEV SEL

BYTE ADDR

DATA IN 1

DATA IN 2

AI01106C

PAGE WRITE

(cont'd)

WC (cont'd)

DATA IN N

ACK

R/W

ACK

R/W

ACK

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