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TRB: Difference between revisions
From SnesLab
(→See Also: TCLR1) |
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Absolute Addressing | Absolute]] | ||
|1C | |1C | ||
|3 bytes | |3 bytes | ||
|6 cycles | |6 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|14 | |14 | ||
|2 bytes | |2 bytes | ||
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'''TRB''' (Test and Reset Bits) is a [[65c816]] instruction that tests and resets bits. | '''TRB''' (Test and Reset Bits) is a [[65c816]] instruction that tests and resets bits using the [[accumulator]]. For each set bit in the accumulator, the corresponding memory bit is cleared. | ||
=== See Also === | === See Also === | ||
Revision as of 00:42, 24 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Absolute | 1C | 3 bytes | 6 cycles | ||||
| Direct Page | 14 | 2 bytes | 5 cycles | ||||
| Flags Clobbered | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | . | |
TRB (Test and Reset Bits) is a 65c816 instruction that tests and resets bits using the accumulator. For each set bit in the accumulator, the corresponding memory bit is cleared.
See Also
External Links
- Eyes & Lichty page on TRB: https://archive.org/details/0893037893ProgrammingThe65816/page/n539
- Labiak page on TRB: https://archive.org/details/Programming_the_65816/page/n204
- snes9x implementation of TRB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1338
- undisbeliever on TRB: https://undisbeliever.net/snesdev/65816-opcodes.html#trb-test-and-reset-memory-bits-against-accumulator