M50FLW040A datasheet(33/64 Pages) STMICROELECTRONICS

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M50FLW040A, M50FLW040B

Status Register

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5.3

Erase status (Bit SR5)

This bit indicates if a problem has occurred during the erasing of a Sector or Block. The

Erase Status bit should be read once the Program/Erase Controller Status bit is ‘1’

(Program/Erase Controller inactive).

When the Erase Status bit is ‘0’, the memory has successfully verified that the Sector/Block

has been erased correctly. When the Erase Status bit is ‘1’, the Program/Erase Controller

has applied the maximum number of pulses to the Sector/Block and still failed to verify that

the Sector/Block has been erased correctly.

Once the Erase Status bit is set to ‘1’, it can only be reset to ‘0’ by a Clear Status Register

command, or by a hardware reset. If it is set to ‘1’, it should be reset before a new Program

or Erase command is issued, otherwise the new command will appear to have failed, too.

5.3.1

Program status (Bit SR4)

This bit indicates if a problem has occurred during the programming of a byte. The Program

Status bit should be read once the Program/Erase Controller Status bit is ‘1’

(Program/Erase Controller inactive).

When the Program Status bit is ‘0’, the memory has successfully verified that the byte has

been programmed correctly. When the Program Status bit is ‘1’, the Program/Erase

Controller has applied the maximum number of pulses to the byte and still failed to verify

that the byte has been programmed correctly.

Once the Program Status bit is set to ‘1’, it can only be reset to ‘0’ by a Clear Status Register

command, or by a hardware reset. If it is set to ‘1’, it should be reset before a new Program

or Erase command is issued, otherwise the new command will appear to have failed, too.

5.3.2

VPP status (Bit SR3)

This bit indicates whether an invalid voltage was detected on the VPP pin at the beginning of

a Program or Erase operation. The VPP pin is only sampled at the beginning of the

operation. Indeterminate results can occur if VPP becomes invalid during a Program or

Erase operation.

Once the VPP Status bit set to ‘1’, it can only be reset to ‘0’ by a Clear Status Register

command, or by a hardware reset. If it is set to ‘1’, it should be reset before a new Program

or Erase command is issued, otherwise the new command will appear to have failed, too.

5.3.3

Program Suspend status (Bit SR2)

This bit indicates that a Program operation has been suspended, and that it is waiting to be

resumed. The Program Suspend Status should only be considered valid when the

Program/Erase Controller Status bit is ‘1’ (Program/Erase Controller inactive). After a

Program/Erase Suspend command is issued, the memory may still complete the operation

instead of entering the Suspend mode.

When the Program Suspend Status bit is ‘0’, the Program/Erase Controller is active, or has

completed its operation. When the bit is ‘1’, a Program/Erase Suspend command has been

issued and the memory is waiting for a Program/Erase Resume command.

When a Program/Erase Resume command is issued, the Program Suspend Status bit

returns to ‘0’.

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