M58PR256J datasheet(46/114 Pages) STMICROELECTRONICS

46 / 114 page

Status Register

M58PR256J, M58PR512J

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6.2

Object Program Mode status bit (SR8)

The Object Program Mode Status Bit, SR8, is used to indicate whether an error occurred

when writing to a Program Region configured in the Object Program mode.

The SR8 bit should be read once the Program/Erase Controller Status bit SR7 is set to ‘1’

(Program/Erase Controller inactive).

SR8 is set to 1 when the user attempts to rewrite an Object Mode region.

When:

●

SR8 = 0, the program operation has completed successfully,

●

SR8 = 1, the program operation failed.

Once set, SR8 can only be cleared by issuing a Clear Status Register command or through

a hardware reset.

SR8 should be cleared before a new program command is issued, otherwise the new

command will appear to fail.

6.3

Program/Erase Controller status bit (SR7)

The Program/Erase Controller Status bit indicates whether the Program/Erase Controller is

active or inactive in any bank. When:

●

SR7 = 0, the Program/Erase Controller is active,

●

SR7 = 1, the Program/Erase Controller is inactive, and the device is ready to process a

new command.

The Program/Erase Controller Status bit is set to ’0’ from immediately after a Program/Erase

Suspend command is issued until the Program/Erase Controller pauses. After the

Program/Erase Controller pauses the bit is set to ’1’.

6.4

Erase Suspend status bit (SR6)

The Erase Suspend Status bit indicates that an erase operation has been suspended in the

addressed Block. When:

●

SR6 = 0 no Program/Erase Suspend command has been issued,

●

SR6 = 1 a Program/Erase Suspend command has been issued and the memory is

waiting for a Program/Erase Resume command.

The Erase Suspend Status bit should only be considered valid when the Program/Erase

Controller Status bit is set to ’1’ (Program/Erase Controller inactive). SR6 is set within the

Erase Suspend Latency time of the Program/Erase Suspend command being issued,

therefore the memory may still complete the operation rather than entering the Suspend

mode.

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

to ’0’.

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