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INC (SPC700): Difference between revisions
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|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Accumulator Addressing | Accumulator]] | ||
|BC | |BC | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Addressing | Direct Page]] | ||
|AB | |AB | ||
|2 | |2 bytes | ||
|4 cycles | |4 cycles | ||
|+ | |+ | ||
| | |[[Direct Page Indexed by X]] | ||
|BB | |BB | ||
|2 | |2 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Absolute Addressing | Absolute]] | ||
|AC | |AC | ||
|3 bytes | |3 bytes | ||
|5 cycles | |5 cycles | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) | ||
|3D | |3D | ||
|1 byte | |1 byte | ||
|2 cycles | |2 cycles | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) | ||
|FC | |FC | ||
|1 byte | |1 byte | ||
| Line 39: | Line 39: | ||
{| 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 | |||
|. | |. | ||
|} | |} | ||
'''INC''' is an [[SPC700]] instruction that increments | '''INC''' is an [[SPC700]] instruction that increments its operand by one. | ||
==== Syntax ==== | |||
<pre> | |||
INC A | |||
INC dp | |||
INC dp+X | |||
INC !abs | |||
INC X | |||
INC Y | |||
</pre> | |||
The above are official, but some people prefer alternate mnemonics like: | |||
<pre> | |||
INA | |||
INX | |||
INY | |||
</pre> | |||
=== See Also === | === See Also === | ||
* [[INC]] | * [[INC]] | ||
* [[DEC (SPC700)]] | * [[DEC (SPC700)]] | ||
* [[INX]] | |||
* [[INY]] | |||
* [[ADC (SPC700)]] | |||
* [[ADC]] | |||
=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on INC: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | * Official Super Nintendo development manual on INC: [https://archive.org/details/SNESDevManual/book1/page/n232 Appendix C-7 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L445 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Addition and Subtraction Commands]] | [[Category:Addition and Subtraction Commands]] | ||
Latest revision as of 14:00, 30 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Accumulator | BC | 1 byte | 2 cycles | ||||
| Direct Page | AB | 2 bytes | 4 cycles | ||||
| Direct Page Indexed by X | BB | 2 bytes | 5 cycles | ||||
| Absolute | AC | 3 bytes | 5 cycles | ||||
| Implied (type 1) | 3D | 1 byte | 2 cycles | ||||
| Implied (type 1) | FC | 1 byte | 2 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| N | . | . | . | . | . | Z | . |
INC is an SPC700 instruction that increments its operand by one.
Syntax
INC A INC dp INC dp+X INC !abs INC X INC Y
The above are official, but some people prefer alternate mnemonics like:
INA INX INY
See Also
External Links
- Official Super Nintendo development manual on INC: Appendix C-7 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L445