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TRB: Difference between revisions

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'''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''' (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.
TRB performs a logical AND (conjunction) and the [[zero flag]] is set or cleared to reflect whether the conjunction is zero.  The conjunction itself is discarded.


==== Syntax ====
==== Syntax ====

Revision as of 17:19, 11 August 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
. . . . . . Z .

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. The conjunction itself is discarded.

Syntax

TRB addr
TRB dp
Cycle Penalties

See Also

External Links