RM0046 Wakeup Unit (WKPU)
Doc ID 16912 Rev 5 779/936
29.5 Functional description
29.5.1 General
This section provides a complete functional description of the Wakeup Unit.
29.5.2 Non-Maskable Interrupts
The Wakeup Unit supports one non-maskable interrupt, which is allocated to pin 1.
The Wakeup Unit supports the generation of three types of interrupts from the NMI input to
the device. The Wakeup Unit supports the capturing of a second event per NMI input before
the interrupt is cleared, thus reducing the chance of losing an NMI event.
Each NMI passes through a bypassable analog glitch filter.
Note: Glitch filter control and pad configuration should be done while the NMI is disabled in order
to avoid erroneous triggering by glitches caused by the configuration process itself.
Figure 455. NMI pad diagram
Glitch Filter
Edge Detect
Flag Overrun
Destination
NMI
critical IRQ
machine check
CPU
NDSS
NREE
NFEE
NFE
NMI Configuration Register (NCR)
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