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32.5.11.11.1 Triggering an erase all external to the flash module
The functionality of the Erase All Blocks/Erase All Blocks Unsecure command is also
available in an un-commanded fashion outside of the flash memory. Refer to the device's
Chip Configuration details for information on this functionality.
Before invoking the external erase all function, the FCCOB0 register must not contain
0x44. When invoked, the erase-all function erases all program flash memory, data flash
memory, data flash IFR space, emulated EEPROM backup, and FlexRAM regardless of
the state of the FSTAT[ACCERR and FPVIOL] flags or the protection settings. If the
post-erase verify passes, the routine releases security by setting the FSEC[SEC] field
register to the unsecure state and the FCNFG[RAMRDY] bit sets. The security byte in
the Flash Configuration Field is also programmed to the unsecure state. The status of the
erase-all request is reflected in the FCNFG[ERSAREQ] bit. The FCNFG[ERSAREQ] bit
is cleared once the operation completes and the normal FSTAT error reporting, except
FPVIOL, is available as described in
32.5.11.12 Verify Backdoor Access Key command
The Verify Backdoor Access Key command only executes if the mode and security
conditions are satisfied (see
Backdoor Access Key command is further qualified by the FSEC[KEYEN] bits. The
Verify Backdoor Access Key command releases security if user-supplied keys in the
FCCOB match those stored in the Backdoor Comparison Key bytes of the Flash
Configuration Field. The column labeled Flash Configuration Field offset address shows
the location of the matching byte in the Flash Configuration Field.
Table 32-45. Verify Backdoor Access Key command FCCOB requirements
FCCOB Number
FCCOB Contents [7:0]
Flash Configuration Field Offset Address
0
0x45 (VFYKEY)
1-3
Not Used
4
Key Byte 0
0x0_0003
5
Key Byte 1
0x0_0002
6
Key Byte 2
0x0_0001
7
Key Byte 3
0x0_0000
8
Key Byte 4
0x0_0007
9
Key Byte 5
0x0_0006
A
Key Byte 6
0x0_0005
B
Key Byte 7
0x0_0004
Functional description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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NXP Semiconductors
Содержание MWCT101 S Series
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