24LC08BH-ESLASHMNY datasheet(6/28 Pages) MICROCHIP

Part #	24LC08BH-E/MNY

Description	8K I2C??Serial EEPROM with Half-Array Write-Protect

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Manufacturer	MICROCHIP [Microchip Technology]

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24AA08H/24LC08BH

DS22084A-page 6

3.6

Device Addressing

A control byte is the first byte received following the

Start condition from the master device (Figure 3-2).

The control byte consists of a four-bit control code. For

the 24XX08H, this is set as ‘

1010’ binary for read and

write operations. The next three bits of the control byte

are the block-select bits (B2, B1, B0). B2 is a “don’t

care” for the 24XX08H. They are used by the master

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

memory are to be accessed. These bits are in effect the

three Most Significant bits 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 24XX08H 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

24XX08H will select a read or write operation.

FIGURE 3-2:

CONTROL BYTE

ALLOCATION

Operation

Control

Code

Block Select

R/W

Read

1010

Block Address

1

Write

1010

Block Address

0

10

1

0

x

B1 B0 R/W ACK

Start Bit

Read/Write Bit

x = “don’t care”

S

Slave Address

Acknowledge Bit

Control Code

Block

Select

Bits

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