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TSB: Difference between revisions
From SnesLab
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=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] page on TSB: https://archive.org/details/0893037893ProgrammingThe65816/page/n540 | * [[Eyes & Lichty]] page 514, on TSB: https://archive.org/details/0893037893ProgrammingThe65816/page/n540 | ||
* [[Labiak]] page on TSB: https://archive.org/details/Programming_the_65816/page/n205 | * [[Labiak]] page on TSB: https://archive.org/details/Programming_the_65816/page/n205 | ||
* snes9x implementation of TSB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1348 | * snes9x implementation of TSB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1348 | ||
Revision as of 04:02, 21 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Absolute | 0C | 3 bytes | 6 cycles* | ||||
| Direct Page | 04 | 2 bytes | 5 cycles* | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | . | |
TSB (Test and Set Bits) is a 65c816 instruction that tests and sets bits using the accumulator. For each set bit of the accumulator, the corresponding memory bit is also set. TSB takes two additional cycles if the accumulator is 16 bits wide. In direct page addressing, TSB takes another additional cycle if the low byte of the direct page register is nonzero.
See Also
External Links
- Eyes & Lichty page 514, on TSB: https://archive.org/details/0893037893ProgrammingThe65816/page/n540
- Labiak page on TSB: https://archive.org/details/Programming_the_65816/page/n205
- snes9x implementation of TSB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1348
- undisbeliever on TSB: https://undisbeliever.net/snesdev/65816-opcodes.html#tsb-test-and-set-memory-bits-against-accumulator