MCP98243 Microchip Technology Inc., MCP98243 Datasheet - Page 36

• Manufacturer Part Number: MCP98243
• Description: Memory Module Temperature Sensor W/ Eeprom For Spd
• Manufacturer: Microchip Technology Inc.

MCP98243
5.3.2
The write Address Byte, word address and the first data
byte are transmitted to the MCP98243 in the same way
as in a byte write. Instead of generating a Stop condi-
tion, the master transmits up to 15 additional data bytes
to the MCP98243, which are temporarily stored in the
on-chip page buffer and will be written into the memory
after the master has transmitted a Stop condition. Upon
receipt of each word, the four lower order address
pointer bits are internally incremented by one. The
higher order four bits of the word address remain
constant. If the master should transmit more than 16
bytes prior to generating the Stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the Stop condition is received, an
internal write cycle will begin
FIGURE 5-15:
DS22153A-page 36
SCL
SDA
PAGE WRITE
1
X
X
2
3
X
Data at (n)
S
Timing Diagram for Page Write (See Section 4.0 “Serial Communication”).
4
X
1
1
X
5
2
0
(Figure
X
6
Address Byte
3
1
X
7
MCP98243
4
X
0
8
5-15).
Note:
5
A
2
A
C
K
A
6
1
1
X
A
0
7
2
X
MCP98243
n is the initial address for a page.
Data at (n+1)
W
8
3
X
A
C
K
4
X
1
X
5
X
Word Address (n)
2
X
6
X
3
X
X
7
MCP98243
4
X
X
8
Note:
5
X
A
C
K
6
X
X
7
X
Page write operations are limited to writing
bytes within a single physical page,
regardless of the number of bytes actually
being written. Physical page boundaries
start at addresses that are integer
multiples of the page buffer size (or ‘page
size’) and end at addresses that are
integer multiples of [page size - 1]. If a
Page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page, as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
X
MCP98243
Data at (n+15)
X
8
X
A
C
K
© 2009 Microchip Technology Inc.
X
X
MCP98243
X
A
C
K
P