24lc01bh Microchip Technology Inc., 24lc01bh Datasheet - Page 7

• Manufacturer Part Number: 24lc01bh
• Description: 1k I 2 C? Serial Eeprom With Half-array Write-protect
• Manufacturer: Microchip Technology Inc.

4.6
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 24XX01H,
this is set as ‘
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 ‘
selected. When set to ‘
Following the Start condition, the 24XX01H monitors
the SDA bus, checking the device type identifier being
transmitted. Upon receiving a ‘
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.
© 2008 Microchip Technology Inc.
Operation
Read
Write
Device Addressing
1010
Control
Code
1010
1010
’ binary for read and write opera-
0
’, a write operation is selected.
Block Address
Block Address
Block Select
1
1010
’, a read operation is
’ code, the slave
R/W
1
0
FIGURE 4-2:
24AA01H/24LC01BH
Start Bit
x = “don’t care”
S
1
Control Code
0
Slave Address
1
CONTROL BYTE
ALLOCATION
0
x
Select
Block
Bits
x
Acknowledge Bit
Read/Write Bit
x
DS22104A-page 7
R/W ACK