ST24 datasheet(8/16 Pages) STMICROELECTRONICS

8 / 16 page

SCL

SDA

SCL

SDA

START

CONDITION

SDA

INPUT

SDA

CHANGE

AI00792

STOP

CONDITION

MSB

ACK

START

CONDITION

SCL

MSB

ACK

STOP

CONDITION

Figure 6. I2C Bus Protocol

Write Operations

The Multibyte Write mode (only available on the

ST24/25C02 and ST24C02R versions) is selected

when the MODE pin is at VIH and the Page Write

mode when MODE pin is at VIL. The MODE pin may

be driven dynamically with CMOS input levels.

Following a START condition the master sends a

device select code with the RW bit reset to ’0’. The

memory acknowledges this and waits for a byte

address. The byte address of 8 bits provides ac-

cess to 256 bytes of the memory. After receipt of

the byte address the device again responds with

an acknowledge.

For the ST24/25W02 versions, any write command

with WC = 1 will not modify the memory content.

Byte Write. In the Byte Write mode the master

sends one data byte, which is acknowledged by the

memory. The master then terminates the transfer

by generating a STOP condition. The Write mode

is independant of the state of the MODE pin which

could be left floating if only this mode was to be

used. However it is not a recommended operating

mode, as this pin has to be connected to either VIH

or VIL, to minimize the stand-by current.

8/16

ST24/25C02, ST24C02R, ST24/25W02

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