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RTI: Difference between revisions

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* [[MCS6500 Manual]] page on RTI: https://archive.org/details/mos_microcomputers_programming_manual/page/n152
* [[MCS6500 Manual]] page on RTI: https://archive.org/details/mos_microcomputers_programming_manual/page/n152
* [[Carr]] page on RTI: https://archive.org/details/6502UsersManual/page/n283
* [[Carr]] page on RTI: https://archive.org/details/6502UsersManual/page/n283
* [[Leventhal]] page on RTI: https://archive.org/details/6502-assembly-language-programming/page/n138
* [[Leventhal]] page 3-89 on RTI: https://archive.org/details/6502-assembly-language-programming/page/n138
* snes9x implementation of RTI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3272
* snes9x implementation of RTI: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3272
* undisbeliever on RTI: https://undisbeliever.net/snesdev/65816-opcodes.html#rti-return-from-interrupt
* undisbeliever on RTI: https://undisbeliever.net/snesdev/65816-opcodes.html#rti-return-from-interrupt

Revision as of 09:08, 4 December 2023

Basic Info
Addressing Mode Opcode Length Speed
Stack (RTI) 40 1 byte 7 cycles*
Flags Affected
N V M X D I Z C
65c816 native mode
6502 emulation mode . .

RTI (Return from INterrupt) is a 65x instruction used to return control from an interrupt handler.

Pitfalls
  • RTI should only be run when the e flag is in the same state as when the interrupt fired
  • RTI cannot even tell whether the interrupt actually occurred or not
Cycle Skipped

RTI takes one fewer cycle in emulation mode as the program bank register doesn't need to be pulled from the stack.

See Also

External Links