TXS: Difference between revisions

Latest revision as of 21:07, 7 August 2024


Basic Info
Addressing Mode	Opcode	Length	Speed
Implied (type 1)	9A	1 byte	2 cycles


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

TXS (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the X index register to the stack pointer.

If X is 16 bits wide then all 16 bits are transferred.
If X is 8 bits wide but the stack pointer is 16 bits wide then X is transferred to the low byte and the high byte of the stack pointer is cleared.
If both X and the stack pointer are 8 bits wide (aka emulation mode) then 8 bits are transferred

No flags are affected.

Syntax

TXS

External Links

Eyes & Lichty, page 518 on TXS
Labiak, page 199 on TXS
8.8 on MCS6500 Manual, page 120 on TXS
Carr, page 277 on TXS
Leventhal, page 3-103 on TXS
snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415

@@ Line 1: / Line 1: @@
-'''TXS''' (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the [[X index register]] to the [[stack pointer]].
+{| class="wikitable" style="float:right;clear:right;width:40%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 9: / Line 7: @@
 |'''Speed'''
 |+
-|implied
+|[[Implied]] (type 1)
 |9A
 |1 byte
@@ Line 16: / Line 14: @@
 {| 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 36: / Line 34: @@
 |.
 |}
+'''TXS''' (Transfer X to Stack Pointer) is a 65x instruction that transfers the value of the [[X index register]] to the [[stack pointer]].
+* If X is 16 bits wide then all 16 bits are transferred.
+* If X is 8 bits wide but the stack pointer is 16 bits wide then X is transferred to the low byte and the high byte of the stack pointer is cleared.
+* If both X and the stack pointer are 8 bits wide (aka [[emulation mode]]) then 8 bits are transferred
+No flags are affected.
+==== Syntax ====
+<pre>
+TXS
+</pre>
 === See Also ===
+* [[TSX]]
 * [[TCS]]
+* [[TXA]]
 === External Links ===
-* [[Eyes & Lichty]] page on TXS: https://archive.org/details/0893037893ProgrammingThe65816/page/n544
+* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/518 page 518] on TXS
-* [[Labiak]] page on TXS: https://archive.org/details/Programming_the_65816/page/n209
+* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n209 page 199] on TXS
-* [[MCS6500 Manual]] page on TXS: https://archive.org/details/mos_microcomputers_programming_manual/page/n139
+* 8.8 on [[MCS6500 Manual]], [https://archive.org/details/mos_microcomputers_programming_manual/page/n139 page 120] on TXS
-* [[Carr]] page on TXS: https://archive.org/details/6502UsersManual/page/n290
+* [[Carr]], [https://archive.org/details/6502UsersManual/page/n290 page 277] on TXS
-* [[Leventhal]] page on TXS: https://archive.org/details/6502-assembly-language-programming/page/n152
+* [[Leventhal]], [https://archive.org/details/6502-assembly-language-programming/page/n152 page 3-103] on TXS
 * snes9x implementation of TXS: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2415
 [[Category:ASM]]
 [[Category:Inherited from 6502]]
+[[Category:Transfer Instructions]]
+[[Category:One-byte Instructions]]
+[[Category:Implied Instructions]]
+[[Category:Two-cycle Instructions]]