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Chapter 8 Mode Entry Module (MC_ME)
MPC5606BK Microcontroller Reference Manual, Rev. 2
168
Freescale Semiconductor
8.4.3.1
Target mode request
The target mode is requested by accessing the ME_MCTL register with the required keys. This mode
transition request by software must be a valid request satisfying a set of predefined rules to initiate the
process. If the request fails to satisfy these rules, it is ignored, and the TARGET_MODE bit field is not
updated. An optional interrupt can be generated for invalid mode requests. See
, for details.
In the case of mode transitions occurring because of hardware events such as a reset, a SAFE mode request,
or interrupt requests and wakeup events to exit from low-power modes, the TARGET_MODE bit field of
the ME_MCTL register is automatically updated with the appropriate target mode. The mode change
process start is indicated by the setting of the mode transition status bit S_MTRANS of the ME_GS
register.
A RESET mode requested via the ME_MCTL register is passed to the MC_RGM, which generates a
global system reset and initiates the reset sequence. The RESET mode request has the highest priority, and
the MC_ME is kept in the RESET mode during the entire reset sequence.
The SAFE mode request has the next highest priority after reset which can be generated by software via
the ME_MCTL register from all software running modes including DRUN, RUN0…3, and TEST or by
the MC_RGM after the detection of system hardware failures, which may occur in any mode.
8.4.3.2
Target mode configuration loading
On completion of the
, the target mode configuration from the
ME_
<target mode>
_MC register is loaded to start the resources (voltage sources, clock sources, flashes,
pads, etc.) control process.
An overview of resource control possibilities for each mode is shown in
indicates that a
given resource is configurable for a given mode.
Table 8-12. MC_ME resource control overview
Resource
Mode
RESET
TEST
SAFE
DRUN
RUN0
HALT
STOP
STANDBY
FIRC
on
on
on
on
on
on
on
on
CFLASH
normal
normal
normal
normal
normal
low-power
power-
down
power-
down
DFLASH
normal
normal
normal
normal
normal
low-power
power-
down
power-
down
MVREG
on
on
on
on
on
on
on
off
Содержание MPC5605BK
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