[PDF] Appendix 1: 6800 Instruction Set

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Appendix 1: 6800 Instruction Set

Store Reference Instructions

ADDRESS MODES

OPERATION

MNEMONIC Immediate Direct Indexed Extended

Add to A ADDA 8B 9B AB

BB Add to B

ADDB CB

DB EB FB

Add to A + Carry ADCA 89 99 A9 B9 Add to B + Carry ADCB C9 D9 E9

F9 AND with A ANDA

84 94
A4 B4

AND with B ANDB

C4

D4 E4 F4

Bit test with A BITA

85
95
AS BS

Bit test with B BITB

CS D5 ES FS Clear CLR 6F 7F

Compare with A

CMPA 81
91 Al
Bl

Compare with B

CMPB C1

D1 El F1

Complement (1 's)

COM 63 73

Decrement DEC

6A 7A

Exc1us. OR with A EORA

88
98 A8
B8

Exc1us. OR with B EORB

C8

D8 E8 F8

Increment

INC 6C 7C Load Acc.A LDAA 86
96
A6 B6

Load Acc. B LDAB

C6 D6 E6 F6

OR with A ORAA

8A 9A AA BA

OR with B ORAB

CA DA EA FA

Rotate Left ROL

69 79

Rotate Right ROR

66
76

Shift Left, Arith.

ASL 68
78

Shift Right, Arith.

ASR 67
77

Shift Right, Logic LSR

64
74

Store Acc. A

STAA 97

A7 B7

Store Acc. B

STAB D7 E7 F7

Subtract from A SUBA

80

90 AO BO

Subtract from B SUBB

CO

DO EO FO

138

Appendix 1: 6800 Instruction Set 139

Sub. from A

with Carry SBCA 82

92 A2 B2

Sub. from B

with Carry SBCB C2 D2 E2 F2 Test

TST 6D 7D

Compare Index Reg. CPX 8C

9C AC BC

Load Index Reg. LDX CE DE EE FE

Load Stack Pointer LDS 8E 9E AE BE

Store Index Reg. STX DF EF FF

Store Stack Pointer STS 9F AF BF

Implicitly Addressed Instructions

OPERATION MNEMONIC CODE

Add Accumulators ABA IB

Clear Acc. A CLRA

4F

Clear Acc. B CLRB SF

Compare Accumulators

CBA 11

Complement Acc. A COMA 43

Complement Acc. B

COMB 53

Negate Acc. A NEGA

40

Negate Acc. B NEGB 50

Decimal Adjust Acc. A DAA 19

Decrement Acc. A DECA 4A

Decrement Acc. B DECB

SA

Increment Acc. A INCA 4C

Increment Acc. B INCB 5C

Push from Acc. A PSHA 36

Push from Acc. B PSHB 37

Pull to Acc. A PULA 32 Pull to Acc. B PULB 33

Rotate Left Acc. A ROLA 49

Rotate Left Acc. B ROLB 59

Arith. Shift Left Acc. A ASLA 48

Arith. Shift Left Acc. B ASLB

58

Arith. Shift Right Acc. A ASRA 47

Arith. Shift Right Acc. B ASRB 57

Logic

Shift Right Acc. A LSRA

44

Logic Shift Right Acc. B LSRB 54

Subtract Accumulators SBA 10

Transfer Accumulators A to B

TAB 16

Transfer Accumulators B to A

TBA 17

Test Acc. A TSTA 4D

140 An Introduction to Low Level Programming for MicroDrocessors

Test Acc. B

Decrement Index Reg.

Decrement Stack Pointer

Increment Index Reg.

Increment Stack Pointer

Transfer

IR to SP

Transfer SP to IR

Clear Carry Bit

Clear Interrupt

Mask

Clear Overflow Bit

Set Carry Bit

Set Interrupt Mask

Set Overflow Bit

Transfer Acc. A

to CC Reg.

Transfer

CC Reg. to Acc. A TSTB

DEX DES INX INS TXS TSX CLC CLI CLV SEC SEI SEV TAP TPA

Branch Instructions -Relative Addressing

OPERATION MNEMONIC

Branch Always BRA

Branch if Carry Clear BCC

Branch if Carry Set BCS

Branch

if = Zero BEQ

Branch

if Zero BGE

Branch

if> Zero BGT

Branch

if Higher BHI

Branch

if Zero BLE

Branch

if Lower or Same BLS

Branch

if Minus BMI

Branch

if Not = Zero BNE

Branch

if Overflow Clear BVC

Branch

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