24AA00_11 Datasheet, PDF (7/34 Pages) Microchip Technology – 128-Bit I2C™ Bus Serial EEPROM

24AA00/24LC00/24C00
5.0 DEVICE ADDRESSING
After generating a Start condition, the bus master
transmits a control byte consisting of a slave address
and a Read/Write bit that indicates what type of
operation is to be performed. The slave address for the
24XX00 consists of a 4-bit device code ‘1010’ followed
by three “don’t care” bits.
The last bit of the control byte determines the operation
to be performed. When set to a one a read operation is
selected, and when set to a zero a write operation is
selected (Figure 5-1). The 24XX00 monitors the bus for
its corresponding slave address all the time. It
generates an Acknowledge bit if the slave address was
true and it is not in a programming mode.
FIGURE 5-1:
CONTROL BYTE FORMAT
Read/Write Bit
Device Select
Bits
Don’t Care
Bits
S 1 0 1 0 x x x R/W ACK
Start Bit
Slave Address
Acknowledge Bit
 1996-2011 Microchip Technology Inc.
DS21178H-page 7