st92f124 STMicroelectronics, st92f124 Datasheet - Page 407

• Manufacturer Part Number: st92f124
• Description: 8/16-bit Single Voltage Flash Mcu Family With Ram, E3 Tmemulated Eeprom, Can 2.0b And J1850 Blpd
• Manufacturer: STMicroelectronics

13 KNOWN LIMITATIONS
Limitations described in this section apply to all sil-
icon revisions. Additional limitations exist on spe-
cific silicon revisions identified by the following
trace codes:
– Gxxxxxxxx1 (ST92F124)
– AxxxxxxxxZ (ST92F150)
– AxxxxxxxxY (ST92F150)
– AxxxxxxxxA (ST92F250)
13.1 ST92F124/F150/F250 KNOWN LIMITATIONS
13.1.1 FLASH ERASE SUSPEND LIMITATIONS
13.1.1.1 Description
In normal operation, the FSUSP bit (bit 2 in the
FCR register) must be set to suspend the current
Sector Erase operation in Flash memory in order
to access a sector not being erased. The Flash
sector erase operation is done in 3 different steps:
1. Program all addresses to 0 on selected sectors
2. Erase and erase verify
3. Reprogramming
If the erase suspend is performed during Steps 1
and 2, the flash works correctly. If the erase sus-
pend is performed during Step 3, the PGER bit (bit
ST92F124/F150/F250 - KNOWN LIMITATIONS
Please contact your nearest sales office for further
information.
6 in the FESR1 register) is set although no pro-
gram error occurred.
13.1.1.2 Workaround
After a Sector Erase suspend operation, the soft-
ware must check the status register to detect if an
erase error occurred (the corresponding sector
must be discarded). Then the software must reset
the FEERR bit. This automatically resets the flash
status register.
Whatever the state of the PGER bit at the end of
the erase operation, it will not impact the applica-
tion and an erase error is still detected.
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