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Non-Maskable Interrupt: Difference between revisions
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A '''non-maskable interrupt''' (NMI) is an interrupt that cannot be ignored. The | A '''non-maskable interrupt''' (NMI) is an interrupt that cannot be ignored. The [[PPU]] normally generates an NMI at the beginning of the vertical blanking period, which is received by the Ricoh CPU. | ||
NMIs have higher priority than [[IRQ]]s, but lower priority than Reset. | NMIs have higher priority than [[IRQ]]s, but lower priority than Reset. | ||
Revision as of 06:44, 8 May 2023
A non-maskable interrupt (NMI) is an interrupt that cannot be ignored. The PPU normally generates an NMI at the beginning of the vertical blanking period, which is received by the Ricoh CPU.
NMIs have higher priority than IRQs, but lower priority than Reset.
References
- 7.19 Interrupt Priorities, page 53: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf