Table 3-1 Interrupt Mask Levels
Mask Mask Bits
Priority Level I2 I1 I0 Interrupts Accepted
High 7 1 1 1 NMI
6 1 1 0 Level 7 and NMI
5 1 0 1 Levels 6 to 7 and NMI
4 1 0 0 Levels 5 to 7 and NMI
3 0 1 1 Levels 4 to 7 and NMI
2 0 1 0 Levels 3 to 7 and NMI
1 0 0 1 Levels 2 to 7 and NMI
Low 0 0 0 0 Levels 1 to 7 and NMI
Table 3-2 Interrupt Mask Bits after an Interrupt is Accepted
Level of Interrupt Accepted I2 I1 I0
NMI (8) 1 1 1
7 111
6 110
5 101
4 100
3 011
2 010
1 001
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