24AA04-E/OTG 데이터 시트보기 (PDF) - Unspecified

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24AA04-E/OTG

4K I2C™ Serial EEPROM

Unspecified 

24AA04/24LC04B

3.6 Device Addressing

A control byte is the first byte received following the

Start condition from the master device. The control byte

consists of a four-bit control code. For the 24XX04, this

is set as ‘1010’ binary for read and write operations.

The next two bits of the control byte are “don’t care’s”

for the 24XX04. The last bit, B0, is used by the master

device to select which of the two 256-word blocks of

memory are to be accessed. This bit is, in effect, the

Most Significant bit of the word address.

The last bit of the control byte defines the operation to

be performed. When set to ‘1’, a read operation is

selected. When set to ‘0’, a write operation is selected.

Following the Start condition, the 24XX04 monitors the

SDA bus checking the device type identifier being

transmitted and, upon receiving a ‘1010’ code, the

slave device outputs an Acknowledge signal on the

SDA line. Depending on the state of the R/W bit, the

24XX04 will select a read or write operation.

Operation

Read

Write

Control

Code

1010

1010

Block Select R/W

Block Address 1

Block Address 0

FIGURE 3-2:

Start

CONTROL BYTE

ALLOCATION

Read/Write

Slave Address

R/W A

1

0

1

0

x

x

B0

x = “don’t care”

DS21708D-page 6

© 2005 Microchip Technology Inc.

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