Information

FCMD Command Program flash 0 Program flash 1 Function
0x03 Read Resource IFR IFR Read 4 bytes from
program flash IFR or
version ID.
0x06 Program Longword × × Program 4 bytes in a
program flash block.
0x08 Erase Flash Block × × Erase a program flash
block. An erase of any
flash block is only
possible when
unprotected.
0x09 Erase Flash Sector × × Erase all bytes in a
program flash sector.
0x0B Program Section × × Program data from the
Section Program Buffer
to a program flash
block.
0x40 Read 1s All Blocks × × Verify that all program
flash blocks are 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 all program flash
blocks, program flash 1
IFR. Then, 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.
0x46 Swap Control × × Handles swap-related
activities
Chapter 28 Flash Memory Module (FTFL)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 623