Motorola M68000 User Manual download pdf (Page 42)

Instruction Set Summary

MOTOROLA M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 3-19

NOTES:

= Logical Not N

= Logical Not V

= Logical Not Z

*Not available for the Bcc instruction.

LSR (r = 0) — * * 0 0

ROXL (r = 0) — * * 0 ? X = C

ROL — * * 0 ? C = Dm – r + 1

ROL (r = 0) — * * 0 0

ASR, LSR, ROXR * * * 0 ? C = Dr – 1

ASR, LSR (r = 0) — * * 0 0

ROXR (r = 0) — * * 0 ? X = C

ROR — * * 0 ? C = Dr – 1

ROR (r = 0) — * * 0 0

? = Other—See Special Definition Rm = Result Operand (MSB)

N = Result Operand (MSB) Rm

= Not Result Operand (MSB)

Z = Rm

Λ…Λ R0 R = Register Tested

Sm = Source Operand (MSB) r = Shift Count

Dm = Destination Operand (MSB)

Table 3-19. Conditional Tests

Mnemonic Condition Encoding Test

True 0000 1

False 0001 0

HI High 0010 C

Λ Z

LS Low or Same 0011 C V Z

CC(HI) Carry Clear 0100 C

CS(LO) Carry Set 0101 C

NE Not Equal 0110 Z

EQ Equal 0111 Z

VC Overflow Clear 1000 V

VS Overflow Set 1001 V

PL Plus 1010 N

MI Minus 1011 N

GE Greater or Equal 1100 N Λ V V N

Λ V

LT Less Than 1101 N Λ V V N Λ V

GT Greater Than 1110 N Λ V Λ Z

V N Λ V Λ Z

LE Less or Equal 1111 Z V N Λ V V N Λ V

Table 3-18. Integer Unit Condition Code Computations (Continued)

Operations

XNZVC

Special Deﬁnition

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 91 92

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Motorola M68000 User Manual Page 42

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