Functional Description - STMicroelectronics SPC572L series Reference Manual

RM0400
Note: The external interrupts are listed in the "I/O signal description and input multiplexing" table
which is contained in a Microsoft Excel
paperclip symbol on the left side of the PDF window, and click it. Double-click on the Excel
file to open it and select the I/O Signal Description Table tab.
69.3.2.6 Wakeup/Interrupt Falling-Edge Event Enable Register (WIFEER)
This register is used to enable falling-edge triggered events on the corresponding
wakeup/interrupt pads.
Address: 0x002C
0 1 2 3
R 0 0 0 0 0 0 0 0 0 0 0 0 0
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 1213. Wakeup/Interrupt Falling-Edge Event Enable Register (WIFEER)
Field
External Interrupt Falling-edge Events Enable x.
IFEEx
1 Falling-edge event is enabled
0 Falling-edge event is disabled
Note: The external interrupts are listed in the "I/O signal description and input multiplexing" table
which is contained in a Microsoft Excel
paperclip symbol on the left side of the PDF window, and click it. Double-click on the Excel
file to open it and select the I/O Signal Description Table tab.
69.4

Functional description

This section provides a complete functional description of the WKPU features.
69.4.1 Non-maskable interrupts
The WKPU allows the external NMI pin (ESR1) to assert the non-maskable interrupts of the
cores on the device. These interrupts include non-maskable interrupts, critical interrupts, or
machine check requests to the core.
The NMI destination interrupt is controlled by the user through the configuration of the
NDSS bits. See
The enabling of rising edge, falling edge, or either edge reaction to the NMI pin is
independent for the core, and is controlled by NFEE[2:0] and NREE[2:0] bits in the NCR.
The WKPU supports the capturing of a second event per NMI input before the interrupt is
cleared, thus reducing the chance of losing an NMI event.
The NMI supports a status flag and an overrun flag, which are located in the NSR. See
Section 69.3.2.1, NMI Status Flag Register (NSR)
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Table 1148. WIFEER field descriptions
Table 1144 for details.
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DocID027809 Rev 4
Wakeup Unit (WKPU)
Access: User read/write
IFEE[14:4]
0 0 0 0
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