M95P16-EXCSSLASHEF datasheet(19/63 Pages) STMICROELECTRONICS

19 / 63 page

Note:

If the PUF bit remains at 1 after power-up, the Status register is read as FF.

Erase flag (ERF) bit

This bit indicates if a previously executed erase operation was completed successfully.

•

0: successful

•

1: error

This volatile bit is refreshed at each erase/write operation. This flag is cleared to 0 at power-up, or by a Clear

safety flag or Software reset instruction.

Program flag (PRF) bit

This bit indicates if a previously executed program operation was completed successfully.

•

0: successful

•

1: error

This volatile bit is refreshed at each program/write operation. In Buffer mode the flag becomes a sticky flag. This

flag is cleared to 0 at power-up, or by a Clear safety flag or Software reset instruction.

ECC1 correction flag (ECC1C) bit

This bit indicates if the ECC corrected a single-bit error during a previously executed read/program/write

operation.

•

0: no correction

•

1: correction done

This volatile bit is refreshed at each read/program/write operation. This flag is cleared to 0 at power-up, or after a

clear safety flag or Software reset instruction.

ECC2 correction flag (ECC2C) bit

This bit indicates if the ECC corrected a double-bit error in a previously executed read/program/write operation.

•

0: no correction

•

1: correction done

This volatile bit is refreshed at each read/program/write operation. This flag is cleared to 0 at power-up, or after a

clear safety flag or Software reset instruction.

ECC3 detection flag (ECC3D) bit

This bit indicates if the ECC detected a triple-bit error in at least one word of 16 bytes in a previously executed

read/program/write operation.

•

0: no detection

•

1: error detection

This volatile bit is refreshed at each read/program/write operation. This flag is cleared to 0 at power-up, or after a

clear safety flag or Software reset instruction.

ECC3 detection flag (ECC3DS) bit

This bit indicates the ECC detected a triple bit error in at least one word of 16 bytes in a previously executed

read/program/write operation.

•

0: no detection

•

1: error detection

This is a sticky volatile bit that can only be reset by issuing a Clear safety flag instruction. This flag is cleared to 0

at power-up, or after a Software reset instruction.

The ECC flag information is cumulative: on the same read instruction the flags are raised as soon as a correction

or a detection occurs, and all flags may be raised.

5.3

Volatile register format

This byte can be read with the RDVR instruction in loop mode. The volatile bit BUFEN is enabled with WRVR

instruction.

M95P16-I M95P16-E

Volatile register format

DS13710 - Rev 1

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