ST92F124 datasheet(59/429 Pages) STMICROELECTRONICS

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ST92F124/F150/F250 - SINGLE VOLTAGE FLASH & E3 TM (EMULATED EEPROM)

The meaning of the FESSx bit for sector x is given

in Table 10.

FLASH & E3 TM STATUS REGISTER 1 (FESR1)

Address: 224003h /221003h-Read Only

Reset value: 0000 0000 (00h)

Bit 7 = ERER. Erase error (Read Only).

This bit is set by hardware when an Erase error oc-

curs during a Flash or an E3 TM write operation.

This error is due to a real failure of a Flash cell,

that can no longer be erased. This kind of error is

fatal and the sector where it occurred must be dis-

carded. This bit is automatically cleared when bit

FEERR of the FESR0 register is cleared by soft-

ware.

0: Erase OK

1: Erase error

Bit 6 = PGER. Program error (Read Only).

This bit is automatically set when a Program error

occurs during a Flash or an E3 TM write operation.

This error is due to a real failure of a Flash cell,

that can no longer be programmed. The byte

where this error occurred must be discarded (if it

was in the E3 TM memory, the byte must be repro-

grammed to FFh and then discarded, to avoid the

error occurring again when that byte is internally

moved). This bit is automatically cleared when bit

FEERR of the FESR0 register is cleared by soft-

ware.

0: Program OK

1: Flash or E3 TM Programming error

Bit 5 = SWER. Swap or 1 over 0 Error (Read On-

ly).

This bit has two different meanings, depending on

whether the current write operation is to Flash or

E3 TM

memory.

In Flash memory this bit is automatically set when

trying to program at 1 bits previously set at 0 (this

does not happen when programming the Protec-

tion bits). This error is not due to a failure of the

Flash cell, but only flags that the desired data has

not been written.

In the E3 TM memory this bit is automatically set

when a Program error occurs during the swapping

of the unselected pages to the new sector when

the old sector is full (see AN1152 for more details).

This error is due to a real failure of a Flash cell,

that can no longer be programmed. When this er-

ror is detected, the embedded algorithm automati-

cally exits the Page Update operation at the end of

the Swap phase, without performing the Erase

Phase 0 on the full sector. In this way the old data

are kept, and through predefined routines in Test-

Flash (Find Wrong Pages = 230029h and Find

Wrong Bytes = 23002Ch), the user can compare

the old and the new data to find where the error oc-

curred.

Once the error has been discovered the user must

take to end the stopped Erase Phase 0 on the old

sector (through another predefined routine in Test-

Flash: Complete Swap = 23002Fh). The byte

where the error occurred must be reprogrammed

to FFh and then discarded, to avoid the error oc-

curring again when that byte is internally moved.

This bit is automatically cleared when bit FEERR

of the FESR0 register is cleared by software.

Bit 4:0 = Reserved.

Table 10. Sector Status Bits

FEERR

FBUSY

EBUSY

FSUSP

FESSx=1

meaning

Write Error in

Sector x

Write operation

on-going in sec-

tor x

Sector Erase

Suspended in

sector x

Don’t care

543

ERER PGER SWER

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