FCMD Command Program flash Function
0x09 Erase Flash Sector × Erase all bytes in a program
flash sector.
0x40 Read 1s All Blocks × Verify that the program flash
block is erased then release
MCU security.
0x41 Read Once IFR Read 4 bytes of a dedicated
64 byte field in the program
flash 0 IFR.
0x43 Program Once IFR One-time program of 4 bytes
of a dedicated 64-byte field in
the program flash 0 IFR.
0x44 Erase All Blocks × Erase the program flash
block, verify-erase and
release MCU security.
NOTE: An erase is only
possible when all
memory locations
are unprotected.
0x45 Verify Backdoor Access Key × Release MCU security after
comparing a set of user-
supplied security keys to
those stored in the program
flash.
27.4.8.3 Flash Commands by Mode
The following table shows the flash commands that can be executed in each flash
operating mode.
Table 27-25. Flash Commands by Mode
FCMD Command
NVM Normal NVM Special
Unsecure Secure MEEN=10 Unsecure Secure MEEN=10
0x01 Read 1s Section × × × × — —
0x02 Program Check × × × × — —
0x03 Read Resource × × × × — —
0x06 Program Longword × × × × — —
0x09 Erase Flash Sector × × × × — —
0x40 Read 1s All Blocks × × × × × —
0x41 Read Once × × × × — —
0x43 Program Once × × × × — —
0x44 Erase All Blocks × × × × × —
0x45
Verify Backdoor Access
Key
× × × × — —
Chapter 27 Flash Memory Module (FTFA)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 439
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