Information

28.3 Memory Map and Registers
This section describes the memory map and registers for the FTFL module. Data read
from unimplemented memory space in the FTFL module is undefined. Writes to
unimplemented or reserved memory space (registers) in the FTFL module are ignored.
28.3.1 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 FTFL 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 Program flash only devices: Reserved
0x0_040E 1 Program flash only devices: 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).
28.3.2 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.
For devices that only contain program flash, the program flash IFR is located within the
program flash 0 memory block.
Chapter 28 Flash Memory Module (FTFL)
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc. 607