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DBNZ (SPC700): Difference between revisions
From SnesLab
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| Line 7: | Line 7: | ||
|'''Speed''' | |'''Speed''' | ||
|+ | |+ | ||
| | |[[Direct Page]] / [[Program Counter Relative]] | ||
|6E | |6E | ||
|3 bytes | |3 bytes | ||
| Line 13: | Line 13: | ||
when condition is true: 7 cycles | when condition is true: 7 cycles | ||
|+ | |+ | ||
| | |[[Implied]] (type 1) / [[Program Counter Relative]] | ||
|FE | |FE | ||
|2 bytes | |2 bytes | ||
Revision as of 20:28, 23 July 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Direct Page / Program Counter Relative | 6E | 3 bytes | when condition is false: 5 cycles
when condition is true: 7 cycles |
||||
| Implied (type 1) / Program Counter Relative | FE | 2 bytes | when condition is false: 4 cycles
when condition is true: 6 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | P | B | H | I | Z | C |
| . | . | . | . | . | . | . | . |
DBNZ is an SPC700 instruction that decrements memory or the Y index register and then jumps if that value is nonzero.
See Also
External Links
- Official Super Nintendo development manual on DBNZ: Appendix C-8 of Book I