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Chapter 10 Power Control Unit (MC_PCU)
MPC5606BK Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor
205
Figure 10-9. MC_PCU Events During Power Sequences (STANDBY mode)
When the MC_PCU receives a system wakeup request, it starts the power-up phase. The power domain is
reconnected 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 deasserted (power-up state).
NOTE
It is possible that due to a wakeup request, power-up is requested before a
power domain completed its power-down sequence. In this case, the
information in that power domain is lost.
10.4.4.3
Power saving for memories during STANDBY mode
All memories that 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.
10.5
Initialization information
To initialize the MC_PCU, the registers PCU_PCONF2…3 should be programmed. After programming
is done, those registers should no longer be changed.
new mode
power-down
RUN0
voltage in
PSTAT.PD1
STANDBY
Notes:
Not drawn to scale; PCONF1.RUN0 = 1; PCONF1.STBY0 = 0
current mode
power-up phase
power domain #1
RUN0
STANDBY
DRUN
requested by ME
power-down state
power-up state
power-up state
phase
Mode set due to reset being asserted to power domain #1
wakeup request
Содержание MPC5605BK
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