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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
23-4
Freescale Semiconductor
NOTE
The PORs for each power supply are not intended to indicate that the power
supply has dropped below the specified voltage range for the device. The
user must monitor the power supplies externally and assert RESET to
provide this precision of monitoring.
Figure 23-2. Regions POR is Asserted
23.4.2.1
1.5V POR Circuit
The 1.5 V POR circuit monitors the voltage on the VRCSNS pad. The 1.5 V POR will function if the
V
RC33
pad is powered. If the user does not power V
RC33
to the specified voltage, the 1.5 V POR will be
disabled and the user must follow the specified power sequence.
23.4.2.2
3.3V POR Circuit
The 3.3 V POR circuit is used to ensure that V
DDSYN
is high enough that the FMPLL will begin to operate
properly.
23.4.2.3
RESET Power POR Circuit
The RESET power POR circuit, which monitors the power supply that is powering the RESET pin, is used
to ensure that the supply that powers the RESET pin is high enough that the state of the input will
propagate reliably. The power supply monitored by this POR can go as high as 5.5 V.
POR Negates
(Ramp Up)
POR Indeterminate
POR Asserts
(Ramp Down)
POR Indeterminate
POR Asserts
Specified Power Supply Range
Power Supply
Содержание MPC5553
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