Mode Entry Module (MC_ME)
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 947
• Power Domain #2 Switch-Off
• Power Domain #2 Switch-On
• The device consumption is less than the pre-defined threshold value (i.e. the S_DC bit of the
ME_GS register is 0).
If the target mode is Standby, the main voltage regulator is not switched off by the MC_ME and the
Standby request is asserted after the above processes have completed upon which the MC_PCU takes
control of the main regulator. As the MC_PCU needs the 16MHz int. RC osc., the fast internal RC
oscillator (16MHz) remains active until all the Standby steps are executed by the MC_PCU after which it
may be switched off depending on the FIRCON bit of the ME_STANDBY_MC register.
25.4.3.22 Current mode update
The current mode status bit field S_CURRENT_MODE of the ME_GS register is updated with the target
mode bit field TARGET_MODE of the ME_MCTL register when:
• All the updated status bits in the ME_GS register match the configuration specified in the
ME_<target mode>_MC register
• Power sequences are done
• Clock disable/enable process is finished
• Processor low-power mode (halt/stop) entry and exit processes are finished
Software can monitor the mode transition status by reading the S_MTRANS bit of the ME_GS register.
The mode transition latency can differ from one mode to another depending on the resources’ availability
before the new mode request and the target mode’s requirements.
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