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MCP98244 bảng dữ liệu(PDF) 36 Page - Microchip Technology

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MCP98244 bảng dữ liệu(HTML) 36 Page - Microchip Technology

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MCP98244
DS20002327D-page 36
 2012-2022 Microchip Technology Inc. and its subsidiaries
5.3.5
READ OPERATION
Read operations are initiated in the same way as write
operations, with the exception that the R/W bit of the
client address is set to ‘1’. There are three basic types
of read operations: current address read, random read
and sequential read.
5.3.5.1
Current Address Read
The MCP98244 contains an address counter that
maintains the address of the last word accessed,
internally incremented by ‘1’. Therefore, if the previous
access (either a read or write operation) was to
address
n, the next current address read operation
would access data from address
n+1. Upon receipt of
the client address with R/W bit set to ‘1’, the MCP98244
issues an acknowledge and transmits the 8-bit data
word. The host will not acknowledge (NAK) the transfer
but does generate a Stop condition and the MCP98244
discontinues transmission (Figure 5-14).
FIGURE 5-14:
Reading Current Word Address (See Section 4.0 “Serial Communication”).
10
1
0
A
A
C
K
N
A
K
S
P
2
A
1
A
0
12
3
4
5
6
7
8
1
2
3
4
567
8
Address Byte
Current Word Address
R
MCP98244
Host
SDA
SCL
00
0
0
0
00
0
Note:
In this example, the current word address is the
previously accessed address location n plus 1.



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