Interrupt Controller Operation - Fujitsu FR60 Hardware Manual

11.3 Interrupt Controller Operation

This section describes the following items regarding operation of the interrupt
controller:
• Priority decision
• NMI
• Hold request cancellation request
• Return from standby mode (stop/sleep)
■ Priority Decision
The interrupt controller selects the interrupt source with the highest priority from among those
that exist simultaneously and outputs the interrupt level and the interrupt number of this source
to the CPU.
The following shows the priority decision criteria for interrupt sources:
• NMI
• Source that meets the following conditions:
- Source with a value other than 31 as the interrupt level (31 means interrupts disabled)
- Source with the smallest value for the interrupt level
- Source with the smallest interrupt number that satisfies the both conditions above
If no interrupt source is selected according to the above decision criteria, 31 (11111
as the interrupt level. The interrupt number at this time is undefined.
Table 11.3-1 shows the relationship between interrupt sources, interrupt numbers and interrupt
levels.
Table 11.3-1 Relationship between Interrupt Sources, Interrupt Numbers, and Interrupt Levels (1 / 4)
Interrupt source
Reset
Mode vector
Reserved for system
Reserved for system
Reserved for system
Reserved for system
Reserved for system
No-coprocessor trap
Coprocessor error trap
INTE instruction
Instruction break exception
Interrupt number
Decimal Hexadecimal
0 00
1 01
2 02
3 03
4 04
5 05
6 06
7 07
8 08
9 09
10 0A
CHAPTER 11 INTERRUPT CONTROLLER
Interrupt
Offset address of
level
−
3FC 000FFFFC
H
−
3F8 000FFFF8
H
−
3F4 000FFFF4
H
−
3F0 000FFFF0
H
−
3EC 000FFFEC
H
−
3E8 000FFFE8
H
−
3E4 000FFFE4
H
−
3E0 000FFFE0
H
−
3DC 000FFFDC
H
−
3D8 000FFFD8
H
−
3D4 000FFFD4
H
) is output
B
Default
RN
TBR
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
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