Example Of Handling An Interrupt Request When An Interrupt Is Already Being Handled - NEC PD78212 User Manual

µ PD78214 Sub-Series
Fig. 12-11 Example of Handling an Interrupt Request When an Interrupt Is Already Being Handled (1/2)
Vectored interrupt request a
Vectored interrupt request e
314
Main routine
Macro service
request b
→
(low priority)
Vectored interrupt
request c
(high priority)
Macro service
request f
→
(high priority)
Macro service
request h
[Nesting 1] [Nesting 2]
Processing a
Processing b
EI
→
Processing c
Macro service
→ →
request d
Processing e
Processing f
EI
→
← Vectored interrupt request g (low priority): Pending
Processing g
Processing h
→
[Nesting 3]
Processing d