MCP98243-BE/MNY MICROCHIP [Microchip Technology], MCP98243-BE/MNY Datasheet - Page 40

• Manufacturer Part Number: MCP98243-BE/MNY
• Description: Memory Module Temperature Sensor w/ EEPROM for SPD
• Manufacturer: MICROCHIP [Microchip Technology]

MCP98243
5.3.4
Read operations are initiated in the same way as write
operations, with the exception that the R/W bit of the
slave address is set to ‘1’. There are three basic types
of read operations: current address read, random read
and sequential read.
TABLE 5-5:
5.3.4.1
The MCP98243 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
would access data from address
the slave address with R/W bit set to ‘1’, the MCP98243
issues an acknowledge and transmits the 8-bit data
FIGURE 5-19:
DS22153B-page 40
Note:
Permanently Protected
Protected with SWP
Not Protected
n
, the next current address read operation
Status
READ OPERATION
X is defined as ‘don’t care’.
Current Address Read
DEVICE RESPONSE WHEN READING SWP/CWP/PWP (NOTE)
SCL
SDA
Reading Current Word Address (See Section 4.0 “Serial Communication”).
Note:
S
SWP/CWP/PWP
SWP/CWP/PWP
n+1
1
1
Command
SWP
CWP
PWP
2
0
. Upon receipt of
In this example, the current word address is the
previously accessed address location n plus 1.
Address Byte
3
1
4
0
A
5
2
6
A
1
NoACK
NoACK
A
7
0
ACK
ACK
ACK
ACK
MCP98243
8
R
A
C
K
word. The master will not acknowledge (NAK) the
transfer but does generate a Stop condition and the
MCP98243 discontinues transmission
1
0
Current Word Address
Address
2
0
X
X
X
X
X
3
0
4
0
5
0
NoACK
NoACK
NoACK
NoACK
NoACK
6
0
ACK
7
0
8
0
Master
© 2009 Microchip Technology Inc.
N
A
K
Data Byte
P
X
X
X
X
X
(Figure
NoACK
NoACK
NoACK
NoACK
NoACK
ACK
5-19).