STY: Difference between revisions

Revision as of 21:26, 21 November 2023


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STY (Store Y) is a 65x instruction that stores the value of the Y index register.

STY takes one additional cycle when the index registers are 16 bits wide, in all addressing modes.
In both direct page addressing modes only, STY takes another additional cycle if the low byte of the direct page register is nonzero.

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-'''STY''' (Store Y) is a 65x instruction that stores the value of the [[Y index register]].  STY takes one additional cycle when the index registers are 16 bits wide, in all [[addressing modes]]. In both [[direct page addressing]] modes only, STY takes another additional cycle if the low byte of the [[direct page register]] is nonzero.
+'''STY''' (Store Y) is a 65x instruction that stores the value of the [[Y index register]].
+===== Cycle Penalties =====
+* STY takes one additional cycle when the index registers are 16 bits wide, in all [[addressing modes]].
+* In both [[direct page addressing]] modes only, STY takes another additional cycle if the low byte of the [[direct page register]] is nonzero.
 === See Also ===