Super FX Instruction Set

alt0

Opcode	Name	Description
0x00	stop	stop processor
0x01	nop	no operation
0x02	cache	set cache base register
0x03	lsr	arithmetic shift left
0x04	rol	rotate left through carry
0x05	bra	branch always
0x06	bge	branch on greater than
0x07	blt	branch on less than
0x08	bne	branch on not equal
0x09	beq	branch on equal
0x0a	bpl	branch on plus
0x0b	bmi	branch on minus
0x0c	bcc	branch on carry clear
0x0d	bcs	branch on carry set
0x0e	bvc	branch on overflow clear
0x0f	bvs	branch on overflow set
0x1n	to Rn	set Dreg
0x2n	with Rn	set Sreg and Dreg
0x3n	stw Rn	store word data to RAM
0x3c	loop	loop
0x3d	alt1	first instruction set
0x3e	alt2	second instruction set
0x3f	alt3	third instruction set (alt1 = 1, alt2 = 1)
0x4n	ldw Rn	load word data from RAM
0x4c	plot	plot pixel
0x4d	swap	swap low and high byte
0x4e	color	set plot color
0x4f	not	invert all bits
0x5n	add Rn	add
0x6n	sub Rn	subtract
0x70	merge	merge high byte of R8 and R7
0x7n	and Rn	logical AND
0x8n	mult Rn	multiply
0x90	sbk	store word data, last RAM address used
0x91	link #xx	link return address
0x95	sex	sign extend register
0x96	asr	arithmetic shift right
0x97	ror	rotate right through carry
0x9n	jmp Rn	jump
0x9e	lob	value of low byte of register
0x9f	fmult	fractional signed multiply
0xan	ibt Rn,#xx	load immediate byte data
0xbn	from Rn	set Sreg
0xc0	hib	value of high byte of register
0xcn	or Rn	logical OR
0xdn	inc Rn	increment
0xdf	getc	get byte from ROM to color register
0xen	dec Rn	decrement
0xef	getb	get byte from ROM buffer
0xfn	iwt Rn,#xx	load immediate word data

alt1

Opcode	Name	Description
0x3n	stb Rn	store byte data to RAM
0x4n	ldb Rn	load byte data from RAM
0x4c	rpix	read pixel color
0x4e	cmode	set plot mode
0x5n	adc Rn	add with carry
0x6n	sbc Rn	subtract with carry
0x7n	bic Rn	bit clear mask
0x8n	umult Rn	unsigned multiply
0x96	div2	divide by 2
0x9n	ljmp Rn	long jump
0x9f	lmult	16x16 signed multiply
0xan	lms Rn,(yy)	load word data from RAM, short address
0xcn	xor Rn	logical exclusive OR
0xef	getbh	get high byte from ROM buffer
0xfn	lm Rn,(xx)	load word data from RAM using 16 bits

alt2

Opcode	Name	Description
0x5n	add #n	add
0x6n	sub #n	subtract
0x7n	and #n	logical AND
0x80	mult #n	signed multiply
0xan	sms (yy),Rn	store word data to RAM, short address
0xcn	or #n	logical OR
0xdf	ramb	set RAM data bank
0xef	getbl	get low byte from ROM buffer
0xfn	sm (xx),Rn	store word data to RAM using 16 bits

alt3

Opcode	Name	Description
0x5n	adc #n	add with carry
0x6n	cmp Rn	compare
0x7n	bic #n	bit clear mask
0x8n	umult #n	unsigned multiply
0xcn	xor #n	logical exclusive OR
0xdf	romb	set ROM data bank
0xef	getbs	get signed byte from ROM buffer