PHX: Difference between revisions

Latest revision as of 12:31, 14 December 2023


Basic Info
Addressing Mode	Opcode	Length	Speed
Stack (Push)	DA	1 byte	3 cycles*


Flags Affected
N	V	M	X	D	I	Z	C
.	.	.	.	.	.	.	.

PHX is a 65c816 instruction that pushes the value of the X index register onto the stack. If X is 16 bits wide, the high byte is pushed first.

Cycle Penalty

PHX takes one additional cycle if the index registers are 16 bits wide.

External Links

Eyes & Lichty page 481, on PHX: https://archive.org/details/0893037893ProgrammingThe65816/page/n507
Labiak page 165 on PHX: https://archive.org/details/Programming_the_65816/page/n175
snes9x implementation of PHX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1878

@@ Line 1: / Line 1: @@
-'''PHX''' is a [[65c816]] instruction that pushes the value of the [[X index register]] onto the [[stack]].
+{| class="wikitable" style="float:right;clear:right;width:40%"
+!colspan="8"|Basic Info
+|+
+|'''Addressing Mode'''
+|'''Opcode'''
+|'''Length'''
+|'''Speed'''
+|+
+|[[Stack Addressing|Stack]] (Push)
+|DA
+|1 byte
+|3 cycles*
+|}
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!colspan="9"|Flags Affected
 |+
-|N
+|[[Negative Flag|N]]
-|V
+|[[Overflow Flag|V]]
-|M
+|[[M Flag|M]]
-|X
+|[[X Flag|X]]
-|D
+|[[Decimal Flag|D]]
-|I
+|[[I Flag|I]]
-|Z
+|[[Zero Flag|Z]]
-|C
+|[[Carry Flag|C]]
 |+
 |.
@@ Line 22: / Line 34: @@
 |.
 |}
+'''PHX''' is a [[65c816]] instruction that pushes the value of the [[X index register]] onto the [[stack]].  If X is 16 bits wide, the high byte is pushed first.
+===== Cycle Penalty =====
+* PHX takes one additional cycle if the index registers are 16 bits wide.
+=== See Also ===
+* [[PHY]]
+* [[PHA]]
+* [[PLX]]
+=== External Links ===
+* [[Eyes & Lichty]] page 481, on PHX: https://archive.org/details/0893037893ProgrammingThe65816/page/n507
+* [[Labiak]] page 165 on PHX: https://archive.org/details/Programming_the_65816/page/n175
+* snes9x implementation of PHX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1878
 [[Category:ASM]]
+[[Category:65c02 additions]]
+[[Category:Push Instructions]]
+[[Category:One-byte Instructions]]
+[[Category:Three-cycle Instructions]]