M45PE16 datasheet(28/45 Pages) STMICROELECTRONICS

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Instructions

M45PE16

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6.9

Page Erase (PE)

The Page Erase (PE) instruction sets to 1 (FFh) all bits inside the chosen page. Before it can

be accepted, 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

instruction 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 14.

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 duration is tPE) is initiated.

While the Page Erase cycle 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 14.

Page Erase (PE) instruction sequence

Address bits A23 to A21 are Don’t Care.

24 Bit Address

AI04046

3456789

29 30 31

Instruction

23 22

MSB

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