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ASL (SPC700): Difference between revisions
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Accumulator Addressing | Accumulator]] | ||
|1C | |1C | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|0B | |0B | ||
|2 bytes | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Indexed by X]] | ||
|1B | |1B | ||
|2 bytes | |2 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|0C | |0C | ||
|3 bytes | |3 bytes | ||
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{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!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 | ||
| | |C | ||
|} | |} | ||
'''ASL''' is an [[SPC700]] instruction that shifts to the left. | '''ASL''' (Arithmetic Shift Left) is an [[SPC700]] instruction that shifts all 8 bits of its operand one bit to the left, more or less multiplying it by two. A zero is shifted into the least significant bit. The most significant bit is shifted into the [[carry flag]]. | ||
==== Syntax ==== | |||
<pre> | |||
ASL A | |||
ASL dp | |||
ASL dp+x | |||
ASL !abs | |||
</pre> | |||
[[File:asl_spc.png]] | |||
=== See Also === | === See Also === | ||
| Line 58: | Line 68: | ||
=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on ASL: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | * Official Super Nintendo development manual on ASL: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L335 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Shift Rotation Commands]] | [[Category:Shift Rotation Commands]] | ||
Latest revision as of 00:05, 15 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | 1C | 1 byte | 2 cycles | ||||
| Direct Page | 0B | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | 1B | 2 bytes | 5 cycles | ||||
| Absolute | 0C | 3 bytes | 5 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | C |
ASL (Arithmetic Shift Left) is an SPC700 instruction that shifts all 8 bits of its operand one bit to the left, more or less multiplying it by two. A zero is shifted into the least significant bit. The most significant bit is shifted into the carry flag.
Syntax
ASL A ASL dp ASL dp+x ASL !abs
See Also
External Links
- Official Super Nintendo development manual on ASL: Appendix C-7 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L335