LJMP (Super FX)

Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Absolute Long Implied (type 1)	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. The high byte of the source register is ignored.

According to fullsnes, the official documentation has the bank and offs operands for LJMP mixed up. ^[3]

The operand can be any general register from R₈ to R₁₃. The value of this general register is loaded into R₁₅ (the program counter).

The instruction following LJMP is already in the pipeline (the delay slot) and will be executed before the first instruction at the jump target.

The ALT0 state is restored. All cache flags are reset.

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

• JMP (Super FX)
• JMP
• BRA (Super FX)
• BRA
• ALT1

External Links

1. Official Nintendo documentation on LJMP: 9.49 on page 2-9-69 of Book II
2. page 2-6-11 of Book II, lbid.
3. https://problemkaputt.de/fullsnes.htm#snescartgsuncpumisc