Mode Entry Module (MC_ME)MPC5606S Microcontroller Reference Manual, Rev. 7946 Freescale Semiconductor• I/O pads power sequence driver is switched off if the target mode is one of Safe, Test, or StopmodesIn Standby mode, the power sequence driver and all pads except the external reset and those mapped onwakeup lines are not powered and therefore high impedance. The wakeup line configuration remainsunchanged.This step is executed only after the Peripheral Clocks Disable process is completed.25.4.3.18 FMPLL0 Switch-OffBased on the FMPLL0ON bit of the ME_ mode>_MC and ME_<target mode>_MC registers, ifFMPLL0 is to be switched off, the MC_ME requests the FMPLL0 to power down and updates itsavailability status bit S_FMPLL0 of the ME_GS register to 0. This step is executed only after the Systemclock switching process is completed.25.4.3.19 Clock Sources Switch-OffBased on the device mode and the source>ON bits of the ME__MC registers, if a givenclock source is to be switched off, the MC_ME requests the clock source to power down and updates itsavailability status bit S_ source> of the ME_GS register to 0.This step is executed only after• System clock switching process is completed in order not to lose the current system clock duringmode transition.• FMPLL0 Switch-Off as the input reference clock of the FMPLL0 can be among these clocksources. This is needed to prevent an unwanted lock transition when the FMPLL0 is switched on.25.4.3.20 Flash Switch-OffBased on the CFLAON and DFLAON bit fields of the ME_ mode>_MC andME_ mode>_MC registers, if any of the flash modules is to be put in a low-power state, theMC_ME requests the flash to enter the corresponding low-power state and waits for the deassertion offlash ready status signal. The exact low-power mode status of the flash modules is updated in the S_CFLAand S_DFLA bit fields of the ME_GS register. This step is executed only when Processor and systemmemory clock disable process is completed.25.4.3.21 Main Voltage Regulator Switch-OffBased on the MVRON bit of the ME_ mode>_MC and ME_ mode>_MC registers, if themain voltage regulator is to be switched off, the MC_ME requests it to power down and clears theavailability status bit S_MVR of the ME_GS register.This step is required only during the entry of low-power modes like Halt and Stop. This step is executedonly after completing the following processes:• FMPLL0 Switch-Off• Flash Switch-Off
