W3100A Datasheet, PDF (44/63 Pages) List of Unclassifed Manufacturers – i2Chip W3100A

In order to synchronize MCU and W3100A, I²C I/F creates the condition for START before transmitting and receiving data, and the condition for STOP is created after
the completion of data transmission and reception. When SDA line becomes low while SCL line is high, it becomes the signal for the condition for START. When
SDA line becomes high while SCL line is high, it becomes the signal for the condition for STOP.
SDA
SCL
Data Validity
DATA
STABLE
DATA
CHANGE
DATA
STABLE
Start and Stop Definition
SDA
SCL
START
STOP
Access method includes random read/write access for 1Byte-unit access and sequential read/write access for sequential access.
RANDOM BYTE WRITE
S
T
A
R
T
SDA
LINE
M
S
B
W
R
I
DEVICE
T
ADDRESS
E
L RAM
S / CS
B WK B
WORD
ADDRESS0(1B)
WORD
ADDRESS1(1B)
L AM
S CS
B KB
L AM
S CS
B KB
DATA(1B)
S
T
O
P
LA
SC
BK
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