M58PR256J datasheet(47/114 Pages) STMICROELECTRONICS

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M58PR256J, M58PR512J

Status Register

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6.5

Erase status bit (SR5)

The Erase Status bit is used to identify if there was an error during a Block Erase operation.

When:

●

SR5 = 0 no error has occurred,

●

SR5 = 1 the Program/Erase Controller has applied the maximum number of pulses to

the Block or bank and still failed to verify that it has erased correctly.

The Erase Status bit should be read once the Program/Erase Controller Status bit is set to

’1’ (Program/Erase Controller inactive).

Once set, the Erase Status bit must be cleared, by a Clear Status Register command or a

hardware reset, before a new erase command is issued, otherwise the new command will

appear to fail.

6.6

Program status bit (SR4)

The Program Status bit is used to identify if there was an error during a program operation.

The Program Status bit should be read once the Program/Erase Controller Status bit is set

to ‘1’ (Program/Erase Controller inactive).

When:

●

SR4 = 0, no error has occurred,

●

SR4 = 1, the Program/Erase Controller has applied the maximum number of pulses to

the Word and still failed to verify that it has programmed correctly.

Attempting to program a '1' to an already programmed bit while VPP = VPPH will also set the

Program Status bit to ’1’. If VPP is different from VPPH, SR4 remains set to '0' and the

attempt is not shown.

Once set to '1', the Program Status bit must be cleared, by a Clear Status Register

command or a hardware reset, before a new program command is issued, otherwise the

new command will appear to fail.

6.7

VPP status bit (SR3)

The VPP Status bit is used to identify an invalid voltage on the VPP pin during program and

erase operations. The VPP pin is only sampled at the beginning of a program or erase

operation. Program and erase operations are not guaranteed if VPP becomes invalid during

an operation.

When:

●

SR3 = 0, the voltage on the VPP pin was sampled at a valid voltage,

●

SR3 = 1, the VPP pin has a voltage that is below the VPP Lockout Voltage, VPPLK, the

memory is protected and program and erase operations cannot be performed.

Once set to ‘1’, the VPP Status bit must be cleared by a Clear Status Register command or a

hardware reset, before a new program or erase command is issued, otherwise the new

command will appear to fail.

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