29.3 Memory Map and Registers
This section describes the memory map and registers for the flash memory module.
Data read from unimplemented memory space in the flash memory module is undefined.
Writes to unimplemented or reserved memory space (registers) in the flash memory
module are ignored.
29.3.1 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 Offset
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).
29.3.2 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 table found here and further
described in the subsequent paragraphs.
Chapter 29 Flash Memory Module (FTFA)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 633
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