Motorola 6800

107 mnemonics, 197 encoded forms, operands big-endian. Generated from crates/isa/src/m6800.rs.

Cycle counts show the base cost; +p is an extra cycle when an indexed access crosses a page boundary, +t when a branch is taken.

SUBA

Subtract from A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`80`	imm8	2	2	NZVC
direct	`90`	addr8	2	3	NZVC
indexed	`A0`	imm8	2	5	NZVC
extended	`B0`	addr16	3	4	NZVC

SUBB

Subtract from B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C0`	imm8	2	2	NZVC
direct	`D0`	addr8	2	3	NZVC
indexed	`E0`	imm8	2	5	NZVC
extended	`F0`	addr16	3	4	NZVC

CMPA

Compare A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`81`	imm8	2	2	NZVC
direct	`91`	addr8	2	3	NZVC
indexed	`A1`	imm8	2	5	NZVC
extended	`B1`	addr16	3	4	NZVC

CMPB

Compare B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C1`	imm8	2	2	NZVC
direct	`D1`	addr8	2	3	NZVC
indexed	`E1`	imm8	2	5	NZVC
extended	`F1`	addr16	3	4	NZVC

SBCA

Subtract with carry from A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`82`	imm8	2	2	NZVC
direct	`92`	addr8	2	3	NZVC
indexed	`A2`	imm8	2	5	NZVC
extended	`B2`	addr16	3	4	NZVC

SBCB

Subtract with carry from B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C2`	imm8	2	2	NZVC
direct	`D2`	addr8	2	3	NZVC
indexed	`E2`	imm8	2	5	NZVC
extended	`F2`	addr16	3	4	NZVC

ANDA

AND A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`84`	imm8	2	2	NZV
direct	`94`	addr8	2	3	NZV
indexed	`A4`	imm8	2	5	NZV
extended	`B4`	addr16	3	4	NZV

ANDB

AND B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C4`	imm8	2	2	NZV
direct	`D4`	addr8	2	3	NZV
indexed	`E4`	imm8	2	5	NZV
extended	`F4`	addr16	3	4	NZV

BITA

Bit test A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`85`	imm8	2	2	NZV
direct	`95`	addr8	2	3	NZV
indexed	`A5`	imm8	2	5	NZV
extended	`B5`	addr16	3	4	NZV

BITB

Bit test B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C5`	imm8	2	2	NZV
direct	`D5`	addr8	2	3	NZV
indexed	`E5`	imm8	2	5	NZV
extended	`F5`	addr16	3	4	NZV

LDAA

Load A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`86`	imm8	2	2	NZV
direct	`96`	addr8	2	3	NZV
indexed	`A6`	imm8	2	5	NZV
extended	`B6`	addr16	3	4	NZV

LDAB

Load B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C6`	imm8	2	2	NZV
direct	`D6`	addr8	2	3	NZV
indexed	`E6`	imm8	2	5	NZV
extended	`F6`	addr16	3	4	NZV

EORA

Exclusive-OR A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`88`	imm8	2	2	NZV
direct	`98`	addr8	2	3	NZV
indexed	`A8`	imm8	2	5	NZV
extended	`B8`	addr16	3	4	NZV

EORB

Exclusive-OR B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C8`	imm8	2	2	NZV
direct	`D8`	addr8	2	3	NZV
indexed	`E8`	imm8	2	5	NZV
extended	`F8`	addr16	3	4	NZV

ADCA

Add with carry to A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`89`	imm8	2	2	NZVC
direct	`99`	addr8	2	3	NZVC
indexed	`A9`	imm8	2	5	NZVC
extended	`B9`	addr16	3	4	NZVC

ADCB

Add with carry to B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`C9`	imm8	2	2	NZVC
direct	`D9`	addr8	2	3	NZVC
indexed	`E9`	imm8	2	5	NZVC
extended	`F9`	addr16	3	4	NZVC

ORAA

OR A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`8A`	imm8	2	2	NZV
direct	`9A`	addr8	2	3	NZV
indexed	`AA`	imm8	2	5	NZV
extended	`BA`	addr16	3	4	NZV

ORAB

OR B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`CA`	imm8	2	2	NZV
direct	`DA`	addr8	2	3	NZV
indexed	`EA`	imm8	2	5	NZV
extended	`FA`	addr16	3	4	NZV

ADDA

Add to A

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`8B`	imm8	2	2	NZVC
direct	`9B`	addr8	2	3	NZVC
indexed	`AB`	imm8	2	5	NZVC
extended	`BB`	addr16	3	4	NZVC

ADDB

Add to B

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`CB`	imm8	2	2	NZVC
direct	`DB`	addr8	2	3	NZVC
indexed	`EB`	imm8	2	5	NZVC
extended	`FB`	addr16	3	4	NZVC

STAA

Store A

Mode	Opcode	Operands	Bytes	Cycles	Flags
direct	`97`	addr8	2	4	NZV
indexed	`A7`	imm8	2	6	NZV
extended	`B7`	addr16	3	5	NZV

STAB

Store B

Mode	Opcode	Operands	Bytes	Cycles	Flags
direct	`D7`	addr8	2	4	NZV
indexed	`E7`	imm8	2	6	NZV
extended	`F7`	addr16	3	5	NZV

CPX

Compare index register

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`8C`	imm16	3	3	NZV
direct	`9C`	addr8	2	4	NZV
indexed	`AC`	imm8	2	6	NZV
extended	`BC`	addr16	3	5	NZV

LDS

Load stack pointer

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`8E`	imm16	3	3	NZV
direct	`9E`	addr8	2	4	NZV
indexed	`AE`	imm8	2	6	NZV
extended	`BE`	addr16	3	5	NZV

LDX

Load index register

Mode	Opcode	Operands	Bytes	Cycles	Flags
immediate	`CE`	imm16	3	3	NZV
direct	`DE`	addr8	2	4	NZV
indexed	`EE`	imm8	2	6	NZV
extended	`FE`	addr16	3	5	NZV

STS

Store stack pointer

Mode	Opcode	Operands	Bytes	Cycles	Flags
direct	`9F`	addr8	2	4	NZV
indexed	`AF`	imm8	2	6	NZV
extended	`BF`	addr16	3	5	NZV

STX

Store index register

Mode	Opcode	Operands	Bytes	Cycles	Flags
direct	`DF`	addr8	2	4	NZV
indexed	`EF`	imm8	2	6	NZV
extended	`FF`	addr16	3	5	NZV

NEG

Negate

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`60`	imm8	2	6	NZVC
extended	`70`	addr16	3	6	NZVC

COM

Complement

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`63`	imm8	2	6	NZVC
extended	`73`	addr16	3	6	NZVC

LSR

Logical shift right

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`64`	imm8	2	6	NZVC
extended	`74`	addr16	3	6	NZVC

ROR

Rotate right

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`66`	imm8	2	6	NZVC
extended	`76`	addr16	3	6	NZVC

ASR

Arithmetic shift right

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`67`	imm8	2	6	NZVC
extended	`77`	addr16	3	6	NZVC

ASL

Arithmetic shift left

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`68`	imm8	2	6	NZVC
extended	`78`	addr16	3	6	NZVC

ROL

Rotate left

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`69`	imm8	2	6	NZVC
extended	`79`	addr16	3	6	NZVC

DEC

Decrement

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`6A`	imm8	2	6	NZV
extended	`7A`	addr16	3	6	NZV

INC

Increment

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`6C`	imm8	2	6	NZV
extended	`7C`	addr16	3	6	NZV

TST

Test

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`6D`	imm8	2	6	NZV
extended	`7D`	addr16	3	6	NZV

JMP

Jump

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`6E`	imm8	2	6	—
extended	`7E`	addr16	3	6	—

CLR

Clear

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`6F`	imm8	2	6	NZVC
extended	`7F`	addr16	3	6	NZVC

JSR

Jump to subroutine

Mode	Opcode	Operands	Bytes	Cycles	Flags
indexed	`AD`	imm8	2	6	—
extended	`BD`	addr16	3	6	—

BRA

Branch always

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`20`	rel8	2	4	—

BHI

Branch if higher

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`22`	rel8	2	4	—

BLS

Branch if lower or same

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`23`	rel8	2	4	—

BCC

Branch if carry clear

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`24`	rel8	2	4	—

BCS

Branch if carry set

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`25`	rel8	2	4	—

BNE

Branch if not equal

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`26`	rel8	2	4	—

BEQ

Branch if equal

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`27`	rel8	2	4	—

BVC

Branch if overflow clear

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`28`	rel8	2	4	—

BVS

Branch if overflow set

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`29`	rel8	2	4	—

BPL

Branch if plus

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2A`	rel8	2	4	—

BMI

Branch if minus

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2B`	rel8	2	4	—

BGE

Branch if greater or equal

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2C`	rel8	2	4	—

BLT

Branch if less than

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2D`	rel8	2	4	—

BGT

Branch if greater than

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2E`	rel8	2	4	—

BLE

Branch if less or equal

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`2F`	rel8	2	4	—

BSR

Branch to subroutine

Mode	Opcode	Operands	Bytes	Cycles	Flags
relative	`8D`	rel8	2	4	—

NOP

No operation

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`01`	—	1	2	—

TAP

Transfer A to CC

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`06`	—	1	2	HINZVC

TPA

Transfer CC to A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`07`	—	1	2	—

INX

Increment X

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`08`	—	1	2	Z

DEX

Decrement X

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`09`	—	1	2	Z

CLV

Clear overflow

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0A`	—	1	2	V

SEV

Set overflow

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0B`	—	1	2	V

CLC

Clear carry

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0C`	—	1	2	C

SEC

Set carry

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0D`	—	1	2	C

CLI

Clear interrupt mask

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0E`	—	1	2	I

SEI

Set interrupt mask

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`0F`	—	1	2	I

SBA

Subtract B from A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`10`	—	1	2	NZVC

CBA

Compare A with B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`11`	—	1	2	NZVC

TAB

Transfer A to B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`16`	—	1	2	NZV

TBA

Transfer B to A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`17`	—	1	2	NZV

DAA

Decimal adjust A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`19`	—	1	2	NZVC

ABA

Add B to A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`1B`	—	1	2	HNZVC

TSX

Transfer SP to X

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`30`	—	1	2	—

INS

Increment SP

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`31`	—	1	2	—

PULA

Pull A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`32`	—	1	2	—

PULB

Pull B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`33`	—	1	2	—

DES

Decrement SP

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`34`	—	1	2	—

TXS

Transfer X to SP

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`35`	—	1	2	—

PSHA

Push A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`36`	—	1	2	—

PSHB

Push B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`37`	—	1	2	—

RTS

Return from subroutine

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`39`	—	1	2	—

RTI

Return from interrupt

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`3B`	—	1	2	HINZVC

WAI

Wait for interrupt

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`3E`	—	1	2	—

SWI

Software interrupt

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`3F`	—	1	2	—

NEGA

Negate A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`40`	—	1	2	NZVC

NEGB

Negate B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`50`	—	1	2	NZVC

COMA

Complement A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`43`	—	1	2	NZVC

COMB

Complement B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`53`	—	1	2	NZVC

LSRA

Logical shift right A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`44`	—	1	2	NZVC

LSRB

Logical shift right B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`54`	—	1	2	NZVC

RORA

Rotate right A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`46`	—	1	2	NZVC

RORB

Rotate right B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`56`	—	1	2	NZVC

ASRA

Arithmetic shift right A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`47`	—	1	2	NZVC

ASRB

Arithmetic shift right B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`57`	—	1	2	NZVC

ASLA

Arithmetic shift left A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`48`	—	1	2	NZVC

ASLB

Arithmetic shift left B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`58`	—	1	2	NZVC

ROLA

Rotate left A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`49`	—	1	2	NZVC

ROLB

Rotate left B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`59`	—	1	2	NZVC

DECA

Decrement A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`4A`	—	1	2	NZV

DECB

Decrement B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`5A`	—	1	2	NZV

INCA

Increment A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`4C`	—	1	2	NZV

INCB

Increment B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`5C`	—	1	2	NZV

TSTA

Test A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`4D`	—	1	2	NZV

TSTB

Test B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`5D`	—	1	2	NZV

CLRA

Clear A

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`4F`	—	1	2	NZVC

CLRB

Clear B

Mode	Opcode	Operands	Bytes	Cycles	Flags
inherent	`5F`	—	1	2	NZVC

Sources

Encodings on this page were taken from:

MC6800 8-Bit Microprocessing Unit Data Sheet — Motorola