PXS20RM Datasheet, PDF (1363/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Wakeup Unit (WKPU)
Table 51-3. NCR Field Descriptions (continued)
Field
Description
NWRE0
NREE0
NFEE0
NFE0
NMI Wakeup Request Enable 0.
1 A set NIF0 bit or set NOVF0 bit causes a system wakeup request
0 System wakeup requests from the corresponding NIF0 bit are disabled
NMI Rising-edge Events Enable 0.
1 Rising-edge event is enabled
0 Rising-edge event is disabled
NMI Falling-edge Events Enable 0.
1 Falling-edge event is enabled
0 Falling-edge event is disabled
NMI Filter Enable 0.
Enable analog glitch filter on the NMI pad input.
1 Filter is enabled
0 Filter is disabled
NOTE
Writing a ‘0’ to both NREE0 and NFEE0 disables the NMI functionality
completely (i.e. no system wakeup or interrupt will be generated on any pad
activity)!
51.4 Functional description
51.4.1 General
This section provides a complete functional description of the WKPU.
51.4.2 Non-maskable interrupts
The WKPU supports one non-maskable interrupt.
The WKPU supports the generation of 3 types of interrupts for the NMI input pin. The WKPU supports
the capturing of a second event before the interrupt is cleared, thus reducing the chance of losing an NMI
event.
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.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
51-5