Hitachi H8S/2678 Series Reference Manual page 92

Figure 3.4 shows a block diagram of the priority decision circuit.
Interrupt source
Figure 3.4 Block Diagram of Interrupt Control Operation
Interrupt Acceptance Control: In interrupt control mode 0, interrupt acceptance control is
performed by means of the I bit in CCR.
Table 3.7 shows the interrupts that can be selected in each interrupt control mode.
Table 3.7 Interrupts Selected in Each Interrupt Control Mode (1)
Interrupt Control Mode
0
2
*: Don't care
Interrupt
control
I
mode 0
Interrupt
acceptance
control
8-level
mask control
I2 to I0
IPR
Interrupt control mode 2
Interrupt Mask Bit
I
0
1
*
Default priority
determination
Selected Interrupts
All interrupts
NMI interrupt
All interrupts
Vector number
75