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Non-Maskable Interrupt
From SnesLab
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. This is the only NMI source on the SNES.[2]
NMIs have higher priority than IRQs, but lower priority than Reset.
See Also
References
- 7.19 Interrupt Priorities, page 53: https://www.westerndesigncenter.com/wdc/documentation/w65c816s.pdf
- https://problemkaputt.de/fullsnes.htm#snesppuinterrupts
External Links
- snes9x implementation of NMI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2663