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Chapter 8 Mode Entry Module (MC_ME)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
165
•
From RUN0…3, SAFE, or TEST mode when the TARGET_MODE bit field of the ME_MCTL
register is written with 0011
As soon as any of the above events has occurred, a DRUN mode transition request is generated. The mode
configuration information for this mode is provided by the ME_DRUN_MC register. In this mode, the
flashes, all clock sources, and the system clock configuration can be controlled by software as required.
After system reset, the software execution starts with the default configuration selecting the 16 MHz int.
RC osc. as the system clock.
This mode is intended to be used by software to:
•
Initialize all registers as per the system needs
NOTE
As flashes can be configured in low-power or power-down state in this
mode, software must ensure that the code executes from RAM before
changing to this mode.
8.4.2.3
SAFE mode
The device enters this mode on the following events:
•
From DRUN, RUN0…3, or TEST mode when the TARGET_MODE bit field of the ME_MCTL
register is written with 0010
•
From any mode except RESET due to a SAFE mode request generated by the MC_RGM because
of some potentially recoverable hardware failure in the system (see
, for details)
As soon as any of the above events has occurred, a SAFE mode transition request is generated. The mode
configuration information for this mode is provided by the ME_SAFE_MC register. This mode has a
predefined configuration, and the 16 MHz int. RC osc. is selected as the system clock.
If the SAFE mode is requested by software while some other mode transition process is ongoing, the new
target mode becomes the SAFE mode regardless of other pending requests. In this case, the new mode
request is not interpreted as an invalid request.
NOTE
If software requests to change to the SAFE mode and then requests to
change back to the parent mode before the mode transition is completed, the
device’s final mode after mode transition will be the parent mode. However,
this is not recommended software behavior. It is recommended for software
to wait until the S_MTRANS bit is cleared after requesting a change to
SAFE before requesting another mode change.
As long as a SAFE event is active, the system remains in the SAFE mode and no write access is allowed
to the ME_MCTL register.
This mode is intended to be used by software to:
•
Assess the severity of the cause of failure and then to either
— Reinitialize the device via the DRUN mode, or
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