Eit Interrupt Levels - Fujitsu FR60 Hardware Manual

3.7.1

EIT Interrupt Levels

The interrupt levels are 0 to 31 and are managed with five bits.
■ EIT Interrupt Levels
Table 3.7-1 shows the allocation of the levels.
Table 3.7-1 Interrupt Levels
Binary
00000
...
...
00011
00100
00101
...
...
01110
01111
10000
10001
...
...
11110
11111
Operation is possible for levels 16 to 31.
The interrupt level does not affect an undefined instruction exception, no-coprocessor trap, coprocessor
error trap, or an INT instruction. It does not change the ILM, either.
Level
Decimal
0 (Reserved for system)
... ...
... ...
3 (Reserved for system)
INTE instruction
4
Step trace trap
5 (Reserved for system)
... ...
... ...
14 (Reserved for system)
15 NMI (for user)
16 Interrupt
17 Interrupt
... ...
... ...
30 Interrupt
31 -
If the original ILM value is between 16
and 31, a program cannot set a value in
this ILM range.
User interrupts prohibited if ILM is set
Interrupts prohibited if ICR is set
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