27.3.1 Flash Configuration Field Description
The program flash memory contains a 16-byte flash configuration field that stores default
protection settings (loaded on reset) and security information that allows the MCU to
restrict access to the flash memory module.
Flash Configuration Field Byte
Address
Size (Bytes) Field Description
0x0_0400 - 0x0_0407 8 Backdoor Comparison Key. Refer to
Verify Backdoor Access Key Command
and Unsecuring the Chip Using
Backdoor Key Access.
0x0_0408 - 0x0_040B 4 Program flash protection bytes. Refer to
the description of the Program Flash
Protection Registers (FPROT0-3).
0x0_040F 1 Reserved
0x0_040E 1 Reserved
0x0_040D 1 Flash nonvolatile option byte. Refer to
the description of the Flash Option
Register (FOPT).
0x0_040C 1 Flash security byte. Refer to the
description of the Flash Security
Register (FSEC).
27.3.2 Program Flash IFR Map
The program flash IFR is nonvolatile information memory that can be read freely, but the
user has no erase and limited program capabilities (see the Read Once, Program Once,
and Read Resource commands in Read Once Command, Program Once Command and
Read Resource Command). The contents of the program flash IFR are summarized in the
following table and further described in the subsequent paragraphs.
The program flash IFR is located within the program flash 0 memory block.
Address Range Size (Bytes) Field Description
0x00 – 0xBF 192 Reserved
0xC0 – 0xFF 64 Program Once Field
27.3.2.1 Program Once Field
The Program Once Field in the program flash IFR provides 64 bytes of user data storage
separate from the program flash main array. The user can program the Program Once
Field one time only as there is no program flash IFR erase mechanism available to the
Chapter 27 Flash Memory Module (FTFA)
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 423
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