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STE12PS bảng dữ liệu(PDF) 29 Page - STMicroelectronics

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STE12PS bảng dữ liệu(HTML) 29 Page - STMicroelectronics

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I2C slave protocol overview
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5.6
Register addressing: read command format
The general format of the read command is shown in
Figure 15.
First part of the general read command consists of writing an address to the Index Register
of the POE controller. If the Index Register already contains the address of the register to be
read, as the result of a previous read or write command, then it is not necessary to write that
address to the Index Register again.
After each byte is read from the POE controller, the Index Register is required to increment
by one.
A read command can contain from 0 to 255 bytes.
Figure 15.
Read command
S
6
54
32
1
0
Device address
W
7
.
Register address (K)
6543210
S
6
54
32
1
0
Device address
R
7
.
Read data (K)
6543210
7
6
54
32
1
0
Read data (K + 1)
7
Read data (K + 2)
6543210
7
6
54
32
1
0
Read data (K + N)
P



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