24AA16H Datasheet, PDF(6/28 Page) Microchip Technology – 16K I2C™ Serial EEPROM with Half-Array Write-Protect

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24AA16H Datasheet, PDF (6/28 Pages) Microchip Technology – 16K I2C™ Serial EEPROM with Half-Array Write-Protect

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24AA16H/24LC16BH

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 â1010â 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 â1â a read operation is

selected. When set to â0â 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 â1010â 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.

Operation

Read

Write

Control

Code

1010

Block Select R/W

Block Address 1

Block Address 0

FIGURE 3-2:

CONTROL BYTE

ALLOCATION

Control Code

Read/Write Bit

Block

Select

Bits

S 1 0 1 0 B2 B1 B0 R/W ACK

Start Bit

Slave Address

Acknowledge Bit

DS22118A-page 6

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