24LC00 MicrochipTechnology, 24LC00 Datasheet - Page 5

• Manufacturer Part Number: 24LC00
• Description: 128BitI2CBusSerialEEPROM
• Manufacturer: MicrochipTechnology

FIGURE 4-1:
FIGURE 4-2:
5.0
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 opera-
tion 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 gener-
ates an acknowledge bit if the slave address was true
and it is not in a programming mode.
SCL
SDA
1996 Microchip Technology Inc.
SCL
SDA
(A)
DEVICE ADDRESSING
CONDITION
START
(B)
DATA TRANSFER SEQUENCE ON THE SERIAL BUS
ACKNOWLEDGE TIMING
1
Transmitter must release the SDA line at this point
allowing the Receiver to pull the SDA line low to
acknowledge the previous eight bits of data.
2
Data from transmitter
3
4
ACKNOWLEDGE
ADDRESS OR
VALID
5
(C)
Preliminary
6
TO CHANGE
ALLOWED
7
DATA
Acknowledge
FIGURE 5-1:
8
Start Bit
Bit
S
9
1
Device Select
(D)
1
Receiver must release the SDA line at this point
so the Transmitter can continue sending data.
0
Bits
Data from transmitter
CONTROL BYTE FORMAT
Slave Address
1
2
0
3
Read/Write Bit
Don’t Care
X
Acknowledge Bit
Bits
X
24xx00
DS21178A-page 5
X
CONDITION
R/W
STOP
(C)
ACK
(A)