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Chapter 5
226
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(1)
Acknowledgment of maskable interrupts in service program
Service program of maskable interrupt or exception
...
...
• EIPC saved to memory or register
• EIPSW saved to memory or register
• EI instruction (interrupt acknowledgment enabled)
...
...
Higher priority maskable interrupt
acknowledgment
...
...
• DI instruction (interrupt acknowledgment disabled)
• Saved value restored to EIPSW
• Saved value restored to EIPC
• RETI instruction
(2)
Generation of exception in service program
Service program of maskable interrupt or exception
...
...
• EIPC saved to memory or register
• EIPSW saved to memory or register
...
• TRAP instruction
...
TRAP/exception acknowledgment
...
...
• Saved value restored to EIPSW
• Saved value restored to EIPC
• RETI instruction
Preliminary User's Manual U17566EE1V2UM00
Interrupt Controller (INTC)
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