24AA16HT datasheet(6/28 Pages) MICROCHIP

Part #	24AA16HT

Description	16K I2C??Serial EEPROM with Half-Array Write-Protect

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Manufacturer	MICROCHIP [Microchip Technology]

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24AA16H/24LC16BH

DS22118A-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 24XX16H, 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). They are used by

the master device to select which of the eight 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 24XX16H 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

24XX16H 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

B2

B1 B0 R/W ACK

Start Bit

Read/Write Bit

S

Slave Address

Acknowledge Bit

Control Code

Block

Select

Bits

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