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Y Index Register: Difference between revisions

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Unlike the [[X index register]], there are no instructions to transfer value of the [[stack pointer]] to/from Y.
Unlike the [[X index register]], there are no instructions to transfer value of the [[stack pointer]] to/from Y.
It is not specified to have any particular value after reset.


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

Revision as of 15:40, 11 August 2024

The Y Index Register on 65x processors often holds the current index when iterating over things. It can be incremented or decremented by one with INY or DEY, but there is no instruction to add or subtract more than one.

On the S-SMP it is always 8 bits wide. On the 65c816, it may be 8 or 16 bits wide.

Unlike the X index register, there are no instructions to transfer value of the stack pointer to/from Y.

It is not specified to have any particular value after reset.

See Also

Reference