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Chapter 8 Mode Entry Module (MC_ME)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
175
8.4.4
Protection of mode configuration registers
While programming the mode configuration registers ME_
<mode>
_MC, the following rules must be
respected. Otherwise, the write operation is ignored and an invalid mode configuration interrupt may be
generated.
•
FIRC must be on if the system clock is one of the following:
— The 16 MHz int. RC osc.
•
The Configuration 00 for the CFLAON and DFLAON bit fields are reserved.
•
MVREG must be on if any of the following is active:
— CFLASH
— DFLASH
•
System clock configurations marked as reserved may not be selected.
•
Configuration 1111 for the SYSCLK bit field is allowed only for the TEST mode, and only in this
case may all system clock sources be turned off.
CAUTION
If the system clock is stopped during TEST mode, the device can exit only
via a system reset.
8.4.5
Mode transition interrupts
The following are the three interrupts related to mode transition implemented in the MC_ME.
8.4.5.1
Invalid mode configuration interrupt
Whenever a write operation is attempted to the ME_
<mode>
_MC registers violating the protection rules
Section 8.4.4, Protection of mode configuration registers
I_ICONF of the ME_IS register is set, and an interrupt request is generated if the mask bit M_ICONF of
ME_IM register is 1.
8.4.5.2
Invalid mode transition interrupt
The mode transition request is considered invalid under the following conditions:
•
If the system is in the SAFE mode and the SAFE mode request from MC_RGM is active, and if
the target mode requested is other than RESET or SAFE, then this new mode request is considered
to be invalid, and the S_SEA bit of the ME_IMTS register is set.
•
If the TARGET_MODE bit field of the ME_MCTL register is written with a value different from
the specified mode values (i.e. a non existing mode), an invalid mode transition event is generated.
When such a non existing mode is requested, the S_NMA bit of the ME_IMTS register is set. This
condition is detected regardless of whether the proper key mechanism is followed while writing
the ME_MCTL register.
•
If some of the device modes are disabled as programmed in the ME_ME register, their respective
configurations are considered reserved, and any access to the ME_MCTL register with those
values results in an invalid mode transition request. When such a disabled mode is requested, the
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