The MVIO module has four edge-triggered interrupts in the PIRx registers. An interrupt
request is generated when the corresponding interrupt source has been enabled and when
the interrupt flag is set. The interrupt request remains active until the interrupt flag
has been cleared in hardware when the interrupt condition is no longer met. Refer to the
“VIC - Vectored Interrupt Controller Module” chapter for more
information.
These system level interrupts also act as DMA triggers. The interrupt does not need to be
enabled to be used as a trigger for DMA transfers. Refer to section “Types of
Hardware Triggers” in the “DMA – Direct Memory Access” chapter for more
information on how to use these DMA triggers.
The VDDIOxPORRIF and VDDIOxPORFIF interrupt flags of the PIRx registers are used to
monitor the status of the VDDIOx Power-On Reset (POR) state, while the VDDIOxLVDRIF and
VDDIOxLVDFIF interrupt flags are used to monitor the VDDIOx Low Voltage detect state.
The
VDDIOxPORRIF will be set when the integrated I/O monitor
circuitry enters the POR state and detects that the MVIO supply does not meet or exceed
the minimum specified voltage requirements for the module to operate properly. Once the
integrated I/O voltage monitors detect that the V
DDIOx domains are fully
powered up and that the proper voltage level thresholds are being met for the MVIO
module to function properly, the
VDDIOxPORFIF interrupt flag
and
RDY status bits will be set.
When the V
DDIOx Low-Voltage detection circuit is enabled using the
LVDEN bit and the voltage threshold level has been set using the
LVD bits, and the corresponding V
DDIOx supply voltage drops below
the configured LVD threshold during normal operation, the VDDIOxLVDRIF of the PIRx
register will be set. Once the V
DDIOx supply voltage recovers and is no
longer lower than the LVD threshold, the VDDIOxLVDFIF will be set. The
LVDSTAT bit can be used to monitor the status of the LVD detection circuitry
in software.
Important: The interrupt flags are set only once per
event, allowing user software to clear the flag while the POR/LVD event is still
active.
