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PHA: Difference between revisions

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(3 cycle Instructions)
(no flags affected)
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'''PHA''' (PusH Accumulator) is a 65x instruction that pushes the value in the [[accumulator]] to the [[stack]].  If the accumulator is 16 bits wide, the high byte is pushed first.  The [[stack pointer]] is decremented.
'''PHA''' (PusH Accumulator) is a 65x instruction that pushes the value in the [[accumulator]] to the [[stack]].  If the accumulator is 16 bits wide, the high byte is pushed first.  The [[stack pointer]] is decremented.
No flags are affected.


===== Cycle Penalty =====
===== Cycle Penalty =====

Revision as of 22:31, 27 June 2024

Basic Info
Addressing Mode Opcode Length Speed
Stack (Push) 48 1 byte 3 cycles*
Flags Affected
N V M X D I Z C
. . . . . . . .

PHA (PusH Accumulator) is a 65x instruction that pushes the value in the accumulator to the stack. If the accumulator is 16 bits wide, the high byte is pushed first. The stack pointer is decremented.

No flags are affected.

Cycle Penalty
  • PHA takes one extra cycle if the accumulator is 16 bits wide.

See Also

External Links