M45PE40 datasheet(19/35 Pages) STMICROELECTRONICS

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M45PE40

Page Erase (PE)

The Page Erase (PE) instruction sets to 1 (FFh) all

bits inside the chosen page. Before it can be ac-

cepted, a Write Enable (WREN) instruction must

previously have been executed. After the Write

Enable (WREN) instruction has been decoded,

the device sets the Write Enable Latch (WEL).

The Page Erase (PE) instruction is entered by

driving Chip Select (S) Low, followed by the in-

struction code, and three address bytes on Serial

Data Input (D). Any address inside the Page is a

valid address for the Page Erase (PE) instruction.

Chip Select (S) must be driven Low for the entire

duration of the sequence.

The instruction sequence is shown in Figure 15..

Chip Select (S) must be driven High after the

eighth bit of the last address byte has been latched

in, otherwise the Page Erase (PE) instruction is

not executed. As soon as Chip Select (S) is driven

High, the self-timed Page Erase cycle (whose du-

ration is tPE) is initiated. While the Page Erase cy-

cle is in progress, the Status Register may be read

to check the value of the Write In Progress (WIP)

bit. The Write In Progress (WIP) bit is 1 during the

self-timed Page Erase cycle, and is 0 when it is

completed. At some unspecified time before the

cycle is complete, the Write Enable Latch (WEL)

bit is reset.

A Page Erase (PE) instruction applied to a page

that is Hardware Protected is not executed.

Any Page Erase (PE) instruction, while an Erase,

Program or Write cycle is in progress, is rejected

without having any effects on the cycle that is in

progress.

Figure 15. Page Erase (PE) Instruction Sequence

Note: Address bits A23 to A19 are Don’t Care.

24 Bit Address

AI04046

3456789

29 30 31

Instruction

23 22

MSB

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