M28W640FCT_06 datasheet(32/77 Pages) STMICROELECTRONICS

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Status Register

M28W640FCT, M28W640FCB

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6.7

Block Protection status (bit 1)

The Block Protection Status bit can be used to identify if a Program or Erase operation has

tried to modify the contents of a locked block.

When the Block Protection Status bit is High (set to ‘1’), a Program or Erase operation has

been attempted on a locked block.

Once set High, the Block Protection Status bit can only be reset Low by a Clear Status

command is issued, otherwise the new command will appear to fail.

6.8

Reserved (bit 0)

Bit 0 of the Status Register is reserved. Its value must be masked.

Note:

Refer to Appendix C: Flowcharts and pseudo codes, for using the Status Register.

Table 11.

Status Register bits(1)

Logic level '1' is High, '0' is Low.

Bit

Name

Logic Level

Definition

P/E.C. Status

'1'

Ready

'0'

Busy

Erase Suspend Status

'1'

Suspended

'0'

In progress or Completed

Erase Status

'1'

Erase Error

'0'

Erase Success

Program Status

'1'

Program Error

'0'

Program Success

3VPP Status

'1'

VPP Invalid, Abort

'0'

VPP OK

Program Suspend Status

'1'

Suspended

'0'

In Progress or Completed

Block Protection Status

'1'

Program/Erase on protected Block,

Abort

'0'

No operation to protected blocks

Reserved

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