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MCP98244 датащи(PDF) 37 Page - Microchip Technology

номер детали MCP98244
подробное описание детали  DDR4 DIMM Temperature Sensor with EEPROM for SPD
PDF  52 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP98244 датащи(HTML) 37 Page - Microchip Technology

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 2012-2013 Microchip Technology Inc.
DS22327C-page 37
MCP98244
5.3.5.2
Random Read
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, the word address must first
be set. This is done by sending the word address to the
MCP98244 as part of a write operation. Once the word
address is sent, the master generates a start condition
following the acknowledge. This terminates the write
operation, but not before the internal address pointer is
set. The master then issues the Address Byte again,
but with the R/W bit set to a ‘1’. The MCP98244 then
issues an acknowledge and transmits the 8-bit data
word. The master will not acknowledge the transfer but
does generate a stop condition and the MCP98244
discontinues transmission (Figure 5-15).
FIGURE 5-15:
Timing Diagram for Random Read (See Section 4.0 “Serial Communication”).
SDA
A
C
K
101
0
A
Word Address (n)
00
0
0
A
C
K
S
2
A
1
A
0
123
45
6
7
8
1
2
345
67
8
SCL
0
Address Byte
MCP98244
MCP98244
W
00
0
10
1
0
A
A
C
K
N
A
K
S
P
2
A
1
A
0
12
3
4
567
8
12
3
4
567
8
Address Byte
Data at (n)
R
MCP98244
Master
SDA
SCL
XX
X
X
X
XX
X
Note:
In this example, ‘n’ is the current Address Word which ‘00’h and the data is the byte at address ‘n’.



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