24lcs21 Microchip Technology Inc., 24lcs21 Datasheet - Page 9

• Manufacturer Part Number: 24lcs21
• Description: 1k 2.5v Dual Mode I 2 C? Serial Eeprom
• Manufacturer: Microchip Technology Inc.

4.2
The write control byte, word address and the first data
byte are transmitted to the 24LCS21 in the same way
as in a byte write. But instead of generating a Stop
condition, the master transmits up to eight data bytes to
the 24LCS21, 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. After
the receipt of each word, the three lower order Address
Pointer bits are internally incremented by one. The
higher order five bits of the word address remains
constant. If the master should transmit more than eight
words 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 5-2).
© 2005 Microchip Technology Inc.
Page Write
It is required that V
during command and data transfer in order to program
the device. This applies to both byte write and page
write operation. Note, however, that the V
during the self-timed program operation. Changing
V
operation will not halt programming of the device.
CLK
Note:
from high-to-low during the self-timed program
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.
CLK
be held at a logic high level
24LCS21
DS21127F-page 9
CLK
is ignored