Operation Of The Interrupt Controller - Fujitsu FR60 Hardware Manual

CHAPTER 9 INTERRUPT CONTROLLER
9.3

Operation of the Interrupt Controller

This section describes interrupt controller operation.
■ Priority Decision
When multiple interrupt sources exist at the same time, the interrupt controller module selects the interrupt
source that has the highest priority and outputs the interrupt level and interrupt number of the selected
interrupt source to the CPU.
The following shows the priority decision criteria for interrupt sources:
1. NMI
2. 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
interrupt level. The interrupt number at this time is undefined.
Table 9.3-1 shows the relationship among interrupt sources, interrupt numbers, and interrupt levels.
Table 9.3-1 Relationship Among 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
Operand break trap
Step trace trap
332
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
11 0B
12 0C
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
−
3D0 000FFFD0
H
−
3CC 000FFFCC
H
) is outputted as the
B
Default
RN
TBR
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H
−
H