Voltage Regulator Controller (VRC) and POR Module
MPC5565 Microcontroller Reference Manual, Rev. 1.0
22-4
Freescale Semiconductor
Figure 22-2. Regions POR is Asserted
22.4.2.1
1.5 V POR Circuit
The 1.5 V POR circuit monitors the voltage on the V
RCSNS
pad. The 1.5 V POR functions if the V
RC33
pad is powered. If the user does not power V
RC33
to the specified voltage, the 1.5 V POR is disabled and
the user must follow the specified power sequence.
22.4.2.2
3.3 V POR Circuit
The 3.3 V POR circuit is used to ensure that V
DDSYN
is high enough that the FMPLL begins to operate
correctly.
22.4.2.3
RESET Power POR Circuit
The RESET power POR circuit monitors the supply that powers the RESET pin, and ensures that the
voltage supply to the RESET pin is high enough to reliably propagate the state of the input. The supply
monitored by this POR cannot exceed 5.5 V.
POR negates
(Ramp up)
POR indeterminate
POR asserts
(Ramp down)
POR indeterminate
POR asserts
Specified power supply range
Power supply
Содержание MPC5565
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