XOR (Super FX)

Basic Info
Addressing Mode	Opcode	Length	Speed
Immediate	3FCn	2 bytes
Implied (type 1)	3DCn	2 bytes

Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
0?	0?	0?	.?	?	.?	?

XOR is a poorly documented (XOR is mentioned on page 2-2-7 of Book II of the Nintendo documentation and in the index) Super FX instruction that performs an exculsive or.

It probably restores the ALT0 state like OR. The speeds are probably the same as OR as well.

The low nybble of the opcode specifies either the immediate value or which general register to use, like OR. We can deduce this by contradiction because if it were the high nybble instead, RPIX would have the same opcode as XOR R₄ making them indistinguishable.

HIB's opcode is C0 and it appears to not care whether ALT1/ALT2 are set. If that is the case, then we can conclude that like OR, R₀ is not available as XOR's operand and neither can zero be the immediate value. (But R₀ can still be the source register.)

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R₀ serves as the default.

Syntax

XOR Rn
XOR #n

See Also

• AND (Super FX)
• NOT
• EOR

References

1. https://en.wikibooks.org/wiki/Super_NES_Programming/Super_FX_tutorial#Instruction_Set_Table
2. Example 3 on page 2-8-10 of Book II of the official Super Nintendo development manual
3. index, lbid. https://archive.org/details/SNESDevManual/book2/page/n412