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8.5 Priority Check
■
Nonmaskable Interrupt (NMI)
When NMI occurs simultaneously with other interrupts, NMI is always selected.
❍
When NMI occurs, the following types of information are posted to the CPU:
• Interrupt level: 15 (01111
B
)
• Interrupt number: 15 (001111
B
)
❍
NMI detection
NMI is set or detected by the external interrupt/NMI module. This module only generates an
interrupt level and number according to an NMI request.
■
Clearing Interrupt Causes
Some restrictions apply between interrupts used to clear interrupt causes and the RETI
instruction used in an interrupt routine. See Section 2.8, "EIT (Exception, Interrupt, and Trap),"
for details.
Reserved by the system 54 36 - 324
H
000FFF24
H
Reserved by the system 55 37 - 320
H
000FFF20
H
Reserved by the system 56 38 - 31C
H
000FFF1C
H
Reserved by the system 57 39 - 318
H
000FFF18
H
Reserved by the system 58 3A - 314
H
000FFF14
H
Reserved by the system 59 3B - 310
H
000FFF10
H
Reserved by the system 60 3C - 30C
H
000FFF0C
H
Reserved by the system 61 3D - 308
H
000FFF08
H
Reserved by the system 62 3E - 304
H
000FFF04
H
Delayed interrupt cause bit 63 3F ICR47 300
H
000FFF00
H
Table 8.5-2 Relationships among Interrupt Causes, Numbers, and Levels (2/2)
Cause of interrupt Interrupt number Interrupt
level
Offset TBR default
address
Decimal Hexadecimal