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STE12PS 데이터시트(PDF) 28 Page - STMicroelectronics

부품명 STE12PS
상세설명  12 channel integrated PSE line manager
PDF  44 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STE12PS 데이터시트(HTML) 28 Page - STMicroelectronics

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I2C slave protocol overview
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5.5
Register addressing: write command format
I2C write command format is shown in
Figure 14.
Figure 14.
Write command
The formatting bits shown in
Figure 14 are defined as follows:
●
S - I2C start condition
●
P - I2C stop condition
●
ACK – acknowledge
●
NACK - not acknowledge
●
R/W - read/write
The device address is the value specified in I2C device address. The register address is an
eight-bit value that is written into an internal Index Register. Each time a byte of data is
written to, or read from the POE controller, the Index Register increments by one.
If the initial value written to the Index Register is K, then the byte immediately following the
Register Address byte is written to the register with an address of K. The next byte is written
to the register with the address of K+1, and so on.
An I2C write command can contain from 0 to 255 write data bytes. Write commands to an
unknown register location are ignored by the interface.
As shown in
Figure 14, bits are ordered with the most significant bit first.
S
6
54
32
1
0
Device address
W
7
.
Register address (K)
6543210
7
6
54
32
1
0
Write data
7
.
Write data (K + 1)
6543210
7
6
54
32
1
0
Write data (K + N)



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