We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
TYX: Difference between revisions
From SnesLab
(nz flag behavior) |
(→Syntax: how many bytes in emulation mode) |
||
| (7 intermediate revisions by the same user not shown) | |||
| Line 25: | Line 25: | ||
|[[Carry Flag|C]] | |[[Carry Flag|C]] | ||
|+ | |+ | ||
| | |N | ||
|. | |. | ||
|. | |. | ||
| Line 31: | Line 31: | ||
|. | |. | ||
|. | |. | ||
| | |Z | ||
|. | |. | ||
|} | |} | ||
| Line 39: | Line 39: | ||
The [[negative flag]] will then match the most significant bit of the transferred value. | The [[negative flag]] will then match the most significant bit of the transferred value. | ||
The [[zero flag]] will indicate whether the transferred value is zero (set if zero). | The [[zero flag]] will indicate whether the transferred value is zero (set if zero). | ||
==== Syntax ==== | |||
<pre> | |||
TYX | |||
</pre> | |||
TYX works even in [[emulation mode]] where one byte is always transferred. | |||
=== See Also === | === See Also === | ||
* [[TXY]] | * [[TXY]] | ||
* [[TYA]] | * [[TYA]] | ||
* [[STY]] | |||
=== External Links === | === External Links === | ||
* [[Eyes & Lichty]] | * [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/521 page 521] on TYX | ||
* [[Labiak]] | * [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n212 page 202] on TYX | ||
* snes9x implementation of TYX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2486 | * snes9x implementation of TYX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2486 | ||
Latest revision as of 15:32, 10 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | BB | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| N | . | . | . | . | . | Z | . |
TYX is a 65c816 instruction that transfers the value of the Y index register to the X index register. The x flag determines whether 8 or 16 bits are transferred.
The negative flag will then match the most significant bit of the transferred value. The zero flag will indicate whether the transferred value is zero (set if zero).
Syntax
TYX
TYX works even in emulation mode where one byte is always transferred.
See Also
External Links
- Eyes & Lichty, page 521 on TYX
- Labiak, page 202 on TYX
- snes9x implementation of TYX: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2486