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JMP (SPC700): Difference between revisions
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Speed''' | |'''Speed''' | ||
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| | |[[Absolute]] | ||
| | |5F | ||
|3 bytes | |3 bytes | ||
|3 cycles | |3 cycles | ||
|+ | |+ | ||
| | |[[Absolute Indexed by X]] | ||
|1F | |1F | ||
|3 bytes | |3 bytes | ||
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!colspan="8"|Flags | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|P | |[[Direct Page Flag|P]] | ||
|B | |[[Break Flag|B]] | ||
|H | |[[Half-Carry Flag|H]] | ||
|I | |[[Interrupt Enable Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
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'''JMP''' is an [[SPC700]] instruction that performs an unconditional branch. | '''JMP''' is an [[SPC700]] instruction that performs an unconditional branch. | ||
With absolute addressing, the SPC jumps to the address specified in the two bytes following the 5F opcode. | |||
With absolute indexed by X addressing, the SPC jumps to the effective address specified by the two bytes following the 1F opcode plus the value in the [[X index register]]. | |||
No flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
JMP !abs | |||
JMP [!abs+X] | |||
</pre> | |||
=== See Also === | === See Also === | ||
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=== External Links === | === External Links === | ||
* Official Super Nintendo development manual on JMP: [https://archive.org/details/SNESDevManual/book1/page/ | * Official Super Nintendo development manual on JMP: Table C-15, [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I] | ||
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L454 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:SPC700]] | [[Category:SPC700]] | ||
[[Category:Branching Commands]] | [[Category:Branching Commands]] | ||
[[Category:Three-byte Instructions]] | |||
Latest revision as of 21:56, 13 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Absolute | 5F | 3 bytes | 3 cycles | ||||
| Absolute Indexed by X | 1F | 3 bytes | 6 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | . | . |
JMP is an SPC700 instruction that performs an unconditional branch.
With absolute addressing, the SPC jumps to the address specified in the two bytes following the 5F opcode.
With absolute indexed by X addressing, the SPC jumps to the effective address specified by the two bytes following the 1F opcode plus the value in the X index register.
No flags are affected.
Syntax
JMP !abs JMP [!abs+X]
See Also
External Links
- Official Super Nintendo development manual on JMP: Table C-15, Appendix C-8 of Book I
- anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L454