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24AA01T-/P

1K I2C™ Serial EEPROM

Microchip Technology 

24AA01/24LC01B

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 24XX01 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). The block select bits are ‘don’t

care’s’ for the 24XX01.

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 24XX01 monitors

the SDA bus checking the device type identifier being

transmitted, upon a 1010 code the slave device out-

puts an acknowledge signal on the SDA line. Depend-

ing on the state of the R/W bit, the 24XX01 will select a

read or write operation.

Operation

Control

Code

Block Select

R/W

Read

1010 Block Address 1

Write

1010 Block Address 0

FIGURE 3-2:

START

CONTROL BYTE

ALLOCATION

READ/WRITE

SLAVE ADDRESS

R/W A

1010X X X

X = ‘Don’t care’.

DS21711A-page 6

 2002 Microchip Technology Inc.

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