Hitachi H8/329 Series Hardware Manual page 78

Program execution
Yes
No
IRQ ?
0
Yes
Reset
I ← 1
Read vector address
Branch to software
interrupt-handling
routine
Figure 4-4. Hardware Interrupt-Handling Sequence
No
Interrupt
requested?
Yes
NMI?
No
No
I = 0?
Yes
No
IRQ ?
1
Yes
Latch vector No.
Save PC
Save CCR
69
Pending
ADI?
Yes