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RTI: Difference between revisions
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===== Cycle Penalty ===== | ===== Cycle Penalty ===== | ||
RTI takes one additional cycle in [[native mode]]. | RTI takes one additional cycle in [[native mode]] as the [[program bank register]] needs to be pulled from the [[stack]]. | ||
=== See Also === | === See Also === | ||
Revision as of 01:30, 26 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (RTI) | 40 | 1 byte | 6 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.
Cycle Penalty
RTI takes one additional cycle in native mode as the program bank register needs to be pulled from the stack.
See Also
External Links
- Eyes & Lichty page 492, on RTI: https://archive.org/details/0893037893ProgrammingThe65816/page/n518
- Labiak page on RTI: https://archive.org/details/Programming_the_65816/page/n186
- 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
- Leventhal page 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
- undisbeliever on RTI: https://undisbeliever.net/snesdev/65816-opcodes.html#rti-return-from-interrupt