68HC11 Instruction Set

Modified and corrected from Tom Dickens. Please notify me of any errors!

Mnemonic	Operation	Addressing Mode	Instruction			Bytes	Cycles	Condition Codes
			Prebyte	Opcode	Operand
ABA	Add Accumulators	INH	—	1B	—	1	2
ABX	Add B to X	INH	—	3A	—	1	3
ABY	Add B to Y	INH	18	3A	—	2	4
ADCA	Add with Carry to A	IMM	—	89	ii	2	2
		DIR	—	99	dd	2	3
		EXT	—	B9	hh ll	3	4
		IND, X	—	A9	ff	2	4
		IND, Y	18	A9	ff	3	5
ADCB	Add with Carry to B	IMM	—	C9	ii	2	2
		DIR	—	D9	dd	2	3
		EXT	—	F9	hh ll	3	4
		IND, X	—	E9	ff	2	4
		IND, Y	18	E9	ff	3	5
ADDA	Add Memory to A	IMM	—	8B	ii	2	2
		DIR	—	9B	dd	2	3
		EXT	—	BB	hh ll	3	4
		IND, X	—	AB	ff	2	4
		IND, Y	18	AB	ff	3	5
ADDB	Add Memory to B	IMM	—	CB	ii	2	2
		DIR	—	DB	dd	2	3
		EXT	—	FB	hh ll	3	4
		IND, X	—	EB	ff	2	4
		IND, Y	18	EB	ff	3	5
ADDD	Add 16-Bit to D	IMM	—	C3	jj kk	3	4
		DIR	—	D3	dd	2	5
		EXT	—	F3	hh ll	3	6
		IND, X	—	E3	ff	2	6
		IND, Y	18	E3	ff	3	7
ANDA	AND A with Memory	IMM	—	84	ii	2	2
		DIR	—	94	dd	2	3
		EXT	—	B4	hh ll	3	4
		IND, X	—	A4	ff	2	4
		IND, Y	18	A4	ff	3	5
ANDB	AND B with Memory	IMM	—	C4	ii	2	2
		DIR	—	D4	dd	2	3
		EXT	—	F4	hh ll	3	4
		IND, X	—	E4	ff	2	4
		IND, Y	18	E4	ff	3	5
ASL	Arithmetic Shift Left	EXT	—	78	hh ll	3	6
		IND, X	—	68	ff	2	6
		IND, Y	18	68	ff	3	7
ASLA	Arithmetic Shift Left A	INH	—	48	—	1	2
ASLB	Arithmetic Shift Left B	INH	—	58	—	1	2
ASLD	Arithmetic Shift Left D	INH	—	05	—	1	3
ASR	Arithmetic Shift Right	EXT	—	77	hh ll	3	6
		IND, X	—	67	ff	2	6
		IND, Y	18	67	ff	3	7
ASRA	Arithmetic Shift Right A	INH	—	47	—	1	2
ASRB	Arithmetic Shift Right B	INH	—	57	—	1	2
BCC	Branch if Carry Clear	REL	—	24	rr	2	3
BCLR	Clear Bit(s)	DIR	—	15	dd mm	3	6
		IND, X	—	1D	ff mm	3	7
		IND, Y	18	1D	ff mm	4	8
BCS	Branch if Carry Set	REL	—	25	rr	2	3
BEQ	Branch if = Zero	REL	—	27	rr	2	3
BGE	Branch if ≥ Zero	REL	—	2C	rr	2	3
BGT	Branch if > Zero	REL	—	2E	rr	2	3
BHI	Branch if Higher	REL	—	22	rr	2	3
BHS	Branch if Higher or Same	REL	—	24	rr	2	3
BITA	Bit(s) Test A with Memory	IMM	—	85	ii	2	2