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JMP (SPC700): Difference between revisions
From SnesLab
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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]]. | 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 ==== | ==== Syntax ==== | ||
Revision as of 19:48, 6 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