24lc02b-e-st Microchip Technology Inc., 24lc02b-e-st Datasheet - Page 6

• Manufacturer Part Number: 24lc02b-e-st
• Description: 2k I2c Serial Eeprom
• Manufacturer: Microchip Technology Inc.

24AA02/24LC02B
3.6
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 24XX02, this
is set as ‘
The next three bits of the control byte are “don’t cares”
for the 24XX02.
The last bit of the control byte defines the operation to
be performed. When set to ‘
selected. When set to ‘
Following the Start condition, the 24XX02 monitors the
SDA bus, checking the device type identifier being
transmitted and, upon a
outputs an Acknowledge signal on the SDA line.
Depending on the state of the R/W bit, the 24XX02 will
select a read or write operation.
DS21709G-page 6
Operation
Read
Write
Device Addressing
1010’
Control
binary for read and write operations.
1010
1010
Code
0
’, a write operation is selected.
‘1010’
Block Address
Block Address
Block Select
1
’, a read operation is
code, the slave device
R/W
1
0
FIGURE 3-2:
Start Bit
x = “don’t care”
S
1
Control Code
0
Slave Address
1
CONTROL BYTE
ALLOCATION
© 2007 Microchip Technology Inc.
0
x
Select
Block
Bits
x
Acknowledge Bit
Read/Write Bit
x
R/W ACK