34LC02-ISLASHP datasheet(8/32 Pages) MICROCHIP

8 / 32 page

34AA02/34LC02

DS22029D-page 8

internal write cycle will begin (Figure 4-2). If an attempt

is made to write to the array when the hardware write

protection has been enabled, the device will acknowl-

edge 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, regard-

less 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 neces-

sary 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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