MCP9843 datasheet(36/62 Pages) MICROCHIP

36 / 62 page

MCP9843/98243

DS22153C-page 36

5.3.2

PAGE WRITE

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

condition, 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 5-14).

FIGURE 5-14:

Timing Diagram for Page Write (See Section 4.0 “Serial Communication”).

Note:

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.

SDA

678

SCL

Address Byte

MCP98243

Data at (n)

678

567

Data at (n+1)

Word Address (n)

MCP98243

Data at (n+15)

MCP98243

Note:

n is the initial address for a page.

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