24LC01BH 데이터 시트보기 (PDF) - Microchip Technology

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24LC01BH

1K I2C™ Serial EEPROM with Half-Array Write-Protect

Microchip Technology 

4.6 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 24XX01H,

this is set as ‘1010’ binary for read and write opera-

tions. The next three bits of the control byte are “don’t

cares” for the 24XX01H.

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 24XX01H monitors

the SDA bus, checking the device type identifier being

transmitted. 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 24XX01H

will select a read or write operation.

Operation

Read

Write

Control

Code

1010

1010

Block Select R/W

Block Address 1

Block Address 0

24AA01H/24LC01BH

FIGURE 4-2:

CONTROL BYTE

ALLOCATION

Control Code

Read/Write Bit

Block

Select

Bits

S 1 0 1 0 x x x R/W ACK

Slave Address

Start Bit

x = “don’t care”

Acknowledge Bit

© 2008 Microchip Technology Inc.

DS22104A-page 7

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