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PHA: Difference between revisions

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[[Category:Push Instructions]]
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[[Category:Three-cycle Instructions]]

Revision as of 12:32, 14 December 2023

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.

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

See Also

External Links