Important: For PIC32CM LS00/LS60 Non-Secure accesses, read
accesses (R*) are allowed only if the external interrupt x (EXTINTx) is set as
Non-Secure in the NONSEC register (NONSEC.EXTINTx bit).
These bits return the valid pin
state of the debounced external interrupt pin EXTINTx.
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