34VL02 datasheet(8/32 Pages) MICROCHIP

8 / 32 page

34VL02

DS22079A-page 8

(Figure 4-2). If an attempt is made to write to the array

when the hardware write protection has been enabled,

the device will acknowledge the command, but no data

will be written. The write cycle time must be observed

even if the write protection is enabled.

FIGURE 4-1:

BYTE WRITE

FIGURE 4-2:

PAGE WRITE

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 multi-

ples of the page buffer size (or ‘page size’)

and end at addresses that are integer mul-

tiples of [page size – 1]. If a Page Write

command attempts to write across a phys-

ical 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.

Bus Activity

Master

SDA Line

Bus Activity

Control

Byte

Word

Address

Data

Bus Activity

Master

SDA Line

Bus Activity

Control

Byte

Word

Address (n)

Data (n)

Data (n + 15)

Data (n + 1)

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