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MCF51QE128 MCU Series Reference Manual, Rev. 3
88 Freescale Semiconductor
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Chapter 4 Memory
4.5.3.2 Flash Protection Violations
The FPVIOL flag is set after the command is written to the FCMD register if any of the following illegal
operations are attempted:
1. Writing the program command if the address written in the command write sequence was in a
protected area of the flash array.
2. Writing the sector erase command if the address written in the command write sequence was in a
protected area of the flash array.
3. Writing the mass erase command while any flash protection is enabled.
4. Writing an invalid command if the address written in the command write sequence was in a
protected area of the flash array.
As a result of any of the above, the command write sequence immediately aborts. If FSTAT[FPVIOL] is
set, clear the FPVIOL flag before starting another command write sequence (see Section 4.4.2.5, “Flash
Status Register (FSTAT)”).
4.5.4 Operating Modes
4.5.4.1 Wait Mode
If a command is active (FCCF = 0) when the MCU enters wait mode, the active command and any buffered
command is completed.
4.5.4.2 Stop Modes
If a command is active (FCCF = 0) when the MCU enters any stop mode, the operation is aborted. If the
operation is program or erase, the flash array data being programmed or erased may be corrupted and the
FCCF and FACCERR flags are set. If active, the high voltage circuitry to the flash array is immediately
switched off when entering stop mode. Upon exit from stop mode, the FCBEF flag is set and any buffered
command is not launched. The FACCERR flag must be cleared before starting a command write sequence
(see Section 4.5.1.2, “Command Write Sequence”).
NOTE
As active commands are immediately aborted when the MCU enters stop
mode, do not use the STOP instruction during program or erase operations.
Active commands continue when the MCU enters wait mode. Use of the
STOP instruction when SOPT1[WAITE] is set is acceptable.
4.5.4.3 Background Debug Mode
In background debug mode, the FPROT register is writable without restrictions. If the MCU is unsecured,
all flash commands listed in Table 4-16 can be executed. If the MCU is secured, only a compound mass
erase and erase verify command can be executed. See Chapter 18, “Version 1 ColdFire Debug
(CF1_DEBUG),” for details.