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(1) To accept maskable interrupts in service program
Service program of maskable interrupt or exception
...
...
• Saves EIPC to memory or register
• Saves EIPSW to memory or register
• EI instruction (enables interrupt acceptance)
...
...
...
...
• DI instruction (disables interrupt acceptance)
• Restores saved value to EIPSW
• Restores saved value to EIPC
• RETI instruction
(2) To generate exception in service program
Service program of maskable interrupt or exception
...
...
• Saves EIPC to memory or register
• Saves EIPSW to memory or register
• EI instruction (enables interrupt acceptance)
...
• TRAP instruction
• Illegal op code
...
• Restores saved value to EIPSW
• Restores saved value to EIPC
• RETI instruction
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CHAPTER 5
INTERRUPT/EXCEPTION PROCESSING FUNCTION
←Accepts interrupt such as INTP input
← Accepts exception such as TRAP instruction
← Accepts exception such as illegal op code
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