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MUL (SPC700): Difference between revisions
From SnesLab
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Implied]] (type 1) | ||
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!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |||
|[[Negative Flag|N]] | |||
|[[Overflow Flag|V]] | |||
|[[Direct Page Flag|P]] | |||
|[[Break Flag|B]] | |||
|[[Half-Carry Flag|H]] | |||
|[[Interrupt Enable Flag|I]] | |||
|[[Zero Flag|Z]] | |||
|[[Carry Flag|C]] | |||
|+ | |+ | ||
|N | |N | ||
|. | |. | ||
|. | |. | ||
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|. | |. | ||
|. | |. | ||
| | |Z | ||
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'''MUL''' is an [[SPC700]] instruction that multiplies the value in the [[Y index register]] by the value in the [[accumulator]] and stores the product in [[YA]]. | '''MUL''' is an [[SPC700]] instruction that multiplies the value in the [[Y index register]] by the value in the [[accumulator]] and stores the product in [[YA]]. The high byte of the product is stored in Y and the low byte is stored in A.<sup>[2]</sup> | ||
==== Syntax ==== | |||
<pre> | |||
MUL | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[DIV]] | * [[DIV]] | ||
* [[ADC (SPC700)]] | |||
* [[SBC (SPC700)]] | |||
* [[MULT]] | |||
* [[UMULT]] | |||
=== External Links === | === External Links === | ||
# Official Super Nintendo development manual on MUL: Table C-13, [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | |||
# https://forums.nesdev.org/viewtopic.php?p=141221#p141221 | |||
# https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L510 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Multiplication and Division Commands]] | [[Category:Multiplication and Division Commands]] | ||
[[Category:One-byte Instructions]] | |||
Latest revision as of 14:06, 30 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 1) | CF | 1 byte | 9 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | . |
MUL is an SPC700 instruction that multiplies the value in the Y index register by the value in the accumulator and stores the product in YA. The high byte of the product is stored in Y and the low byte is stored in A.[2]
Syntax
MUL
See Also
External Links
- Official Super Nintendo development manual on MUL: Table C-13, Appendix C-8 of Book I
- https://forums.nesdev.org/viewtopic.php?p=141221#p141221
- https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L510