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ASL: Difference between revisions

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* Except in [[accumulator addressing]], ASL takes two extra cycles when the accumulator is 16 bits wide
* Except in [[accumulator addressing]], ASL takes two extra cycles when the accumulator is 16 bits wide
* In [[direct page addressing]] modes, ASL takes another extra cycle if the low byte of the [[direct page register]] is nonzero.
* In [[direct page addressing]] modes, ASL takes another extra cycle if the low byte of the [[direct page register]] is nonzero.
[[File:asl.png]]


=== See Also ===
=== See Also ===

Revision as of 18:22, 27 June 2024

Basic Info
Addressing Mode Opcode Length Speed
Accumulator 0A 1 byte 2 cycles
Absolute 0E 3 bytes 6 cycles*
Direct Page 06 2 bytes 5 cycles*
Absolute Indexed by X 1E 3 bytes 7 cycles*
Direct Page Indexed by X 16 2 bytes 6 cycles*
Flags Affected
N V M X D I Z C
. . . . .

ASL (Arithmetic Shift Left) is a 65x instruction that shifts a value by left one bit (multiplication by two). The most significant bit is shifted into the carry flag. The least significant bit becomes a zero.

Cycle Penalties

asl.png

See Also

External Links

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