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TRB: Difference between revisions

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=== External Links ===
=== External Links ===
* [[Eyes & Lichty]] page 513, on TRB: https://archive.org/details/0893037893ProgrammingThe65816/page/n539
* [[Eyes & Lichty]] page 513, on TRB: https://archive.org/details/0893037893ProgrammingThe65816/page/513
* [[Labiak]] page 194 on TRB: https://archive.org/details/Programming_the_65816/page/n204
* [[Labiak]] page 194 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
* snes9x implementation of TRB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1338

Revision as of 11:29, 15 July 2024

Basic Info
Addressing Mode Opcode Length Speed
Absolute 1C 3 bytes 6 cycles*
Direct Page 14 2 bytes 5 cycles*
Flags Affected
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.

TRB performs a logical AND (conjunction) and the zero flag is set or cleared to reflect whether the conjunction is zero.

Syntax

TRB addr
TRB dp
Cycle Penalties

See Also

External Links