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24.4.11.13 Erase All Blocks Unsecure Command
The Erase All Blocks Unsecure operation erases all flash memory, verifies all memory
contents, programs the security byte in the Flash Configuration Field to the unsecure
state, and releases MCU security.
Table 24-33. Erase All Blocks Unsecure Command FCCOB Requirements
FCCOB Number
FCCOB Contents [7:0]
0
0x49 (ERSALLU)
After clearing CCIF to launch the Erase All Blocks Unsecure command, the flash
memory module erases all program flash memory and the program flash erasable IFR
space, then verifies that all are erased.
If the flash memory module verifies that all program flash memory and the program flash
erasable IFR space was properly erased, access control is disabled, security is released by
setting the FSEC[SEC] field to the unsecure state, and the security byte (see
Configuration Field Description
) is programmed to the unsecure state by the Erase All
Blocks Unsecure command. If the erase or program verify fails, the FSTAT[MGSTAT0]
bit is set. The CCIF flag is set after the Erase All Blocks Unsecure operation completes.
Access control determined by the contents of the FXACC registers will not block
execution of the Erase All Blocks Unsecure command. While most Flash memory will be
erased, the program flash IFR space containing the Program Once XACC and SACC
fields will not be erased and, therefore, the contents of the Program Once XACC and
SACC fields will not change. The contents of the FXACC and FSACC registers will not
be impacted by the execution of the Erase All Blocks Unsecure command. After
completion of the Erase All Blocks Unsecure command, access control is disabled until
the next reset of the flash module or the Read 1s All Blocks command is executed and
fails (FSTAT[MGSTAT0] is set).
Table 24-34. Erase All Blocks Unsecure Command Error Handling
Error Condition
Error Bit
Command not available in current mode/security
FSTAT[ACCERR]
Any errors have been encountered during erase or program verify operations
FSTAT[MGSTAT0]
Functional Description
K32 L2A Reference Manual, Rev. 2, 01/2020
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NXP Semiconductors
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