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LJMP (Super FX): Difference between revisions
From SnesLab
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=== Example === | |||
Let: | |||
R<sub>1</sub> : 0001h | |||
The following program jumps from 00:8006h to 01:0002h: | |||
bank :addr code | |||
00 :8000h IWT R<sub>10</sub>, #0002h | |||
00 :8003h FROM R<sub>1</sub> | |||
00 :8004h LJMP R<sub>10</sub> | |||
00 :8006h NOP | |||
=== See Also === | === See Also === | ||
Revision as of 22:33, 8 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| 3D9n | 2 bytes | 6 cycles | 6 cycles | 2 cycle | |||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | . | . | . | . | ||
LJMP (Long Jump) is a Super FX instruction that performs a (possibly interbank) jump.
The low byte of the source register is loaded into the program bank register.
According to fullsnes, the official documentation has the bank and offs operands for LJMP mixed up. [2]
The operand can be any register from R8 to R13.
The instruction following LJMP is already in the pipeline (the delay slot) and will be executed before the first instruction at the jump target.
Syntax
LJMP Rn
Example
Let:
R1 : 0001h
The following program jumps from 00:8006h to 01:0002h:
bank :addr code 00 :8000h IWT R10, #0002h 00 :8003h FROM R1 00 :8004h LJMP R10 00 :8006h NOP
See Also
External Links
- Official Nintendo documentation on LJMP: 9.49 on Page 2-9-69 of Book II
- https://problemkaputt.de/fullsnes.htm#snescartgsuncpumisc