M24C32-R_05 데이터 시트보기 (PDF) - STMicroelectronics

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M24C32-R_05

64Kbit and 32Kbit Serial I²C Bus EEPROM

STMicroelectronics 

M24C64, M24C32

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)

WC

BYTE WRITE

ACK

ACK

ACK

ACK

DEV SEL

BYTE ADDR BYTE ADDR

DATA IN

R/W

WC

PAGE WRITE

WC (cont'd)

PAGE WRITE

(cont'd)

ACK

ACK

ACK

ACK

DEV SEL

BYTE ADDR BYTE ADDR DATA IN 1

DATA IN 2

R/W

ACK

ACK

DATA IN N

AI01106C

10/26

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