mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 175

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Chapter 8
Security
8.1 Introduction
The device implements security based on the mode selected from the flash module. The
following sections provide an overview of flash security and of the effects of security on
non-flash modules.
8.2 Flash Security
The flash module provides security information to the MCU based on the state held by
the flash memory (FTFL) module's FSEC[SEC] bits. The MCU, in turn, confirms the
security request and limits access to flash resources. During reset, the flash module
initializes the FSEC register using data read from the security byte of the flash
configuration field. For more information, refer to the
Description.
In the unsecured state, all flash commands are available to the programming interfaces
(BDM and EzPort) and so is user code execution of Flash Controller commands. When
the flash is secured, programmer interfaces have no access to memory locations and are
allowed only to launch mass erase operations.
Further information regarding the flash security options and enabling/disabling flash
security is available in the detailed description of the
information regarding the flash security options and enabling/disabling flash security in
BDM is available in the detailed description of
Freescale Semiconductor, Inc.
The security features apply only to external accesses via debug
and EzPort. CPU accesses to the flash are not affected by the
status of FSEC.
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
NOTE
V1 ColdFire
flash memory
Flash Configuration Field
debug.
module. Further
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