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Interrupt Handler: Difference between revisions
From SnesLab
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An '''Interrupt Handler''' is a subroutine which the CPU automatically runs when an interrupt occurs. | An '''Interrupt Handler''' is a subroutine which the CPU automatically runs when an interrupt occurs. | ||
ISR stands for "interrupt service routine." Interrupts are never serviced when an instruction is only partially finished running (except if you count MVP/MVN which can be interrupted once every 7 cycles). | ISR stands for "interrupt service routine." Interrupts are never serviced when an instruction is only partially finished running (except if you count MVP/MVN which can be interrupted once every 7 cycles), but only after the instruction completes. | ||
Use [[BRK]] to force a software interrupt. | Use [[BRK]] to force a software interrupt. | ||
Revision as of 19:20, 31 July 2024
An Interrupt Handler is a subroutine which the CPU automatically runs when an interrupt occurs.
ISR stands for "interrupt service routine." Interrupts are never serviced when an instruction is only partially finished running (except if you count MVP/MVN which can be interrupted once every 7 cycles), but only after the instruction completes.
Use BRK to force a software interrupt.
Return control back with RTI or RETI.