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ST92124JDV1TC bảng dữ liệu(PDF) 59 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TM(EMULATED EEPROM), CAN 2.0B AND J1850 BLPD
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ST92F124/F150/F250 - SINGLE VOLTAGE FLASH & E3 TM (EMULATED EEPROM)
REGISTER DESCRIPTION (Cont’d)
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
1-
-
Write Error in
Sector x
01
-
Write operation
on-going in sec-
tor x
00
1
Sector Erase
Suspended in
sector x
0
0
0
Don’t care
76
543
21
0
ERER PGER SWER
9


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