M25PX32-VMP6F datasheet(44/63 Pages) STMICROELECTRONICS

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Instructions

M25PX32

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6.15

Subsector Erase (SSE)

The Subsector Erase (SSE) instruction sets to 1 (FFh) all bits inside the chosen subsector.

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 Subsector Erase (SSE) instruction is entered by driving Chip Select (S) Low, followed

by the instruction code, and three address bytes on Serial Data input (DQ0). Any address

inside the Subsector (see Table 4) is a valid address for the Subsector Erase (SSE)

instruction. Chip Select (S) must be driven Low for the entire duration of the sequence.

The instruction sequence is shown in Figure 23.

Chip Select (S) must be driven High after the eighth bit of the last address byte has been

latched in, otherwise the Subsector Erase (SSE) instruction is not executed. As soon as

Chip Select (S) is driven High, the self-timed Subsector Erase cycle (whose duration is tSSE)

is initiated. While the Subsector 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 Subsector 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 Subsector Erase (SSE) instruction issued to a sector that is hardware or software

protected, is not executed.

Any Subsector Erase (SSE) 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 23.

Subsector Erase (SSE) instruction sequence

Address bits A23 to A22 are Don’t care.

24 Bit Address

DQ0

AI13741

3456789

29 30 31

Instruction

23 22

MSB

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