ST10F296 datasheet(55/346 Pages) STMICROELECTRONICS

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ST10F296E

Internal Flash memory

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Flash error register (FER)

The Flash error register (and all other Flash registers) can only be properly read once the

LOCK bit of the FCR0L register is low. Nevertheless, its content is updated when the BSY

bits are reset. For this reason, it is meaningful to read the FER register content only when

the LOCK bit and all BSY bits are cleared.

FER (0xE 0014)

FCR

Reset value: 0000h

Reserved

WPF RESER SEQER

Reserved

10ER PGER ERER ERR

Table 24.

FER register description

Bit

Bit name

Function

15-9

Reserved

8WPF

Write protection flag

This bit is automatically set when trying to program or erase in a sector

that is write protected. In the case of a multiple sector erase,

unprotected sectors are erased, protected sectors are not erased, and

the WPF bit is set. The WPF bit has to be reset by software.

RESER

Resume error

This bit is automatically set when a suspended program or erase

operation is not resumed correctly due to a protocol error. In this case

the suspended operation is aborted. This bit has to be reset by software.

SEQER

Sequence error

This bit is automatically set when the control registers (FCR1H/L-

FCR0H/L, FARH/L, FDR1H/L-FDR0H/L) are not correctly filled to

execute a valid write operation. In this case no write operation is

executed. This bit has to be reset by software.

5-4

Reserved

310ER

1 over 0 error

This bit is automatically set when trying to program bits to 1 that have

previously been set to 0 (this does not happen when programming the

protection bits). This error is not due to a failure of the Flash cell. It flags

that the desired data has not been written. The 10ER bit has to be reset

by software.

2PGER

Program error

This bit is automatically set when a program error occurs during a Flash

write operation. This error is due to a failure of a Flash cell that can no

longer be programmed. The word where this error occurred must be

discarded. This bit has to be reset by software.

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