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Chapter 7
Interrupt/Exception Processing Function
Preliminary User’s Manual U14913EE1V0UM00
7.2.3 Non-maskable interrupt status flag (NP)
The NP flag is a status flag that indicates that non-maskable interrupt (NMI) processing is under execu-
tion.
This flag is set when an NMI interrupt has been acknowledged, and masks all interrupt requests and
exceptions to prohibit multiple interrupts from being acknowledged.
Figure 7-5: Non-maskable Interrupt Status Flag (NP)
31
8
7
6
5
4
3
2
1
0
Initial
value
PSW
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 NP EP ID SAT CY OV S Z 00000020H
Bit Position
Bit Name
Function
7
NP
Indicates whether NMI interrupt processing is in progress.
0: No NMI interrupt processing
1: NMI interrupt currently being processed
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