M58CR064C datasheet(21/70 Pages) STMICROELECTRONICS

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M58CR064C, M58CR064D, M58CR064P, M58CR064Q

Once set High, the VPP Status bit can only be reset

Low by a Clear Status Register command or a

hardware reset. If set High it should be reset be-

fore a new Program or Erase command is issued,

otherwise the new command will appear to fail.

Program Suspend Status Bit (SR2). The

Pro-

gram Suspend Status bit indicates that a Program

operation has been suspended in the addressed

block. When the Program Suspend Status bit is

High (set to ‘1’), a Program/Erase Suspend com-

mand has been issued and the memory is waiting

for a Program/Erase Resume command. The Pro-

gram Suspend Status should only be considered

valid when the Program/Erase Controller Status

bit is High (Program/Erase Controller inactive).

SR2 is set within 5µs of the Program/Erase Sus-

pend command being issued therefore the memo-

ry may still complete the operation rather than

entering the Suspend mode.

When a Program/Erase Resume command is is-

sued the Program Suspend Status bit returns Low.

Block Protection Status Bit (SR1). The

Block

Protection Status bit can be used to identify if a

Program or Block 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 at-

tempted on a locked block.

Once set High, the Block Protection Status bit can

only be reset Low by a Clear Status Register com-

mand or a hardware reset. If set High it should be

reset before a new command is issued, otherwise

the new command will appear to fail.

Reserved Bit (SR0). SR0 is reserved. Its value

must be masked.

Table 8. Status Register Bits

Note: Logic level ’1’ is High, ’0’ is Low.

Bit

Name

Type

Logic Level

Definition

SR7

P/E.C. Status

Status

’1’

Ready

’0’

Busy

SR6

Erase Suspend Status

Status

’1’

Erase Suspended

’0’

Erase In progress or Completed

SR5

Erase Status

Error

’1’

Erase Error

’0’

Erase Success

SR4

Program Status

Error

’1’

Program Error

’0’

Program Success

SR3

VPP Status

Error

’1’

VPP Invalid, Abort

’0’

VPP OK

SR2

Program Suspend Status Status

’1’

Program Suspended

’0’

Program In Progress or Completed

SR1

Block Protection Status

Error

’1’

Program/Erase on protected Block, Abort

’0’

No operation to protected blocks

SR0

Reserved

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