Power Control Unit (MC_PCU)
MPC5606S Microcontroller Reference Manual, Rev. 7
992 Freescale Semiconductor
When the MC_PCU receives a system wakeup request, it starts the startup phase. The power domain is
re-connected to the power supply and the voltage in power domain #1 will increase slowly. Once the
voltage is in an operable range, clocks are enabled and the reset is be deasserted (startup state).
NOTE
It is possible that due to a wakeup request, startup is requested before a
power domain completed its power-down sequence. In this case, the
information in that power domain is lost.
29.4.4.3 Power saving for memories during Standby mode
All memories which are not powered down during Standby mode automatically enter a power saving state.
No software configuration is required to enable this power saving state. While a memory is residing in this
state an increased power saving is achieved. Data in the memories is retained.
29.5 Initialization information
To initialize the MC_PCU, the registers PCU_PCONF2… should be programmed. After programming is
done, those registers should no longer be changed.
29.6 Application information
29.6.1 Standby mode considerations
Standby offers maximum power saving possibility. But power is only saved during the time a power
domain is disconnected from the supply. Increased power is required when a power domain is re-connected
to the power supply. Additional power is required during restoring the information (e.g. in the platform).
Care should be taken that the time during which the SoC is operating in Standby mode is significantly
longer than the required time for restoring the information.
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