24AA02T MICROCHIP [Microchip Technology], 24AA02T Datasheet - Page 7

• Manufacturer Part Number: 24AA02T
• Manufacturer: MICROCHIP [Microchip Technology]

5.0
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.
FIGURE 5-2:
© 2009 Microchip Technology Inc.
Operation
Read
Write
DEVICE ADDRESSING
1010’
Control
x = “don’t care”
binary for read and write operations.
1010
1010
Code
1
Control
Code
0
0
ADDRESS SEQUENCE BIT ASSIGNMENTS
’, a write operation is selected.
‘1010’
1
Control Byte
Block Address
Block Address
Block Select
0
1
’, a read operation is
code, the slave device
x
Select
Block
bits
x
x
R/W
R/W
1
0
FIGURE 5-1:
A
7
Start Bit
x = “don’t care”
•
S
Address Low Byte
24AA02/24LC02B
•
1
Control Code
•
0
•
Slave Address
1
•
CONTROL BYTE
ALLOCATION
0
•
A
0
x
Select
Block
Bits
x
Acknowledge Bit
Read/Write Bit
x
DS21709J-page 7
R/W ACK