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Национальный исследовательский университет «МИЭТ»

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Микроконтроллеры ЭВМ

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MC68000-Programmer-Manual.pdf

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Instruction Set Summary

Table 3-17. Monadic Floating-Point Operations

Instruction	Operation

FABS	Absolute Value

FACOS	Arc Cosine

FASIN	Arc Sine

FATAN	Hyperbolic Art Tangent

FCOS	Cosine

FCOSH	Hyperbolic Cosine

FETOX	ex
FETOXM1	ex – 1
FGETEXP	Extract Exponent

FGETMAN	Extract Mantissa

FINT	Extract Integer Part

FINTRZ	Extract Integer Part, Rounded-to-Zero

Instruction	Operation

FLOGN	In(x)

FLOGNP1	In(x + 1)

FLOG10	Log10(x)

FLOG2	Log2(x)

FNEG	Negate

FSIN	Sine

FSINH	Hyperbolic Sine

FSQRT	Square Root

FTAN	Tangent

FTANH	Hyperbolic Tangent

FTENTOX	10x
FTWOTOX	2x

3.2 INTEGER UNIT CONDITION CODE COMPUTATION

Many integer instructions affect the CCR to indicate the instruction,s results. Program and system control instructions also use certain combinations of these bits to control program and system ﬂow. The condition codes meet consistency criteria across instructions, uses, and instances. They also meet the criteria of meaningful results, where no change occurs unless it provides useful information. Refer to Section 1 Introduction for details concerning the CCR.

Table 3-18 lists the integer condition code computations for instructions and Table 3-19 lists the condition names, encodings, and tests for the conditional branch and set instructions. The test associated with each condition is a logical formula using the current states of the condition codes. If this formula evaluates to one, the condition is true. If the formula evaluates to zero, the condition is false. For example, the T condition is always true, and the EQ condition is true only if the Z-bit condition code is currently true.

MOTOROLA

M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL

3-17

Instruction Set Summary

Table 3-18. Integer Unit Condition Code Computations

Operations

Special Deﬁnition

ABCD

C = Decimal Carry

Z = Z Λ

Λ … Λ

ADD, ADDI, ADDQ

V = Sm Λ Dm Λ

Λ Rm

C = Sm Λ Dm V

Λ Dm V Sm Λ

ADDX

V = Sm Λ Dm Λ

Λ Rm

C = Sm Λ Dm V

Λ Dm V Sm Λ

Z = Z Λ Rm Λ … Λ

AND, ANDI, EOR, EORI,

—

MOVEQ, MOVE, OR, ORI,

CLR, EXT, EXTB, NOT, TAS, TST

CHK

—

CHK2, CMP2

—

Z = (R = LB) V (R = UB)

C = (LB ≤ UB) Λ (IR < LB) V (R > UB))

V (UB < LB) Λ (R > UB) Λ (R < LB)

SUB, SUBI, SUBQ

V =

Λ Dm Λ

V Sm Λ

Λ Rm

C = Sm Λ

V Rm Λ

V Sm Λ Rm

SUBX

V =

Λ Dm Λ

V Sm Λ

Λ Rm

C = Sm Λ

V Rm Λ

V Sm Λ Rm

Z = Z Λ Rm Λ … Λ

CAS, CAS2, CMP, CMPA, CMPI,

—

V =

Λ Dm Λ

V Sm Λ

Λ Rm

CMPM

C = Sm Λ

V Rm Λ

V Sm Λ Rm

DIVS, DUVU

—

= Division Overflow

MULS, MULU

—

= Multiplication Overflow

SBCD, NBCD

C = Decimal Borrow

Z = Z Λ

Λ … Λ

NEG

V = Dm Λ Rm

C = Dm V Rm

NEGX

V = Dm Λ Rm

C = Dm V Rm

Z = Z Λ

Λ … Λ

BTST, BCHG, BSET, BCLR

—

— Z =

BFTST, BFCHG, BFSET, BFCLR

—

N = Dm

Z =

Λ … Λ

Dm–1

BFEXTS, BFEXTU, BFFFO

—

N = Sm

Z = Sm Λ

Sm–1

Λ… Λ

BFINS

—

N = Dm

Z =

Λ… Λ

Dm–1

ASL

V = Dm Λ

V… V

r V

Dm–1

Dm–

(DM –1 V …+ Dm – r)

C =

Dm–

r+1

ASL (r = 0)

—

LSL, ROXL

C = Dm – r + 1

3-18

M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL

MOTOROLA

Instruction Set Summary

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

Operations

Special Deﬁnition

LSR (r = 0)

—

ROXL (r = 0)

—

X = C

ROL

—

C = Dm – r + 1

ROL (r = 0)

—

ASR, LSR, ROXR

C = Dr – 1

ASR, LSR (r = 0)

—

ROXR (r = 0)

—

X = C

ROR

—

C = Dr – 1

ROR (r = 0)

—

? = Other—See Special Definition

Rm = Result Operand (MSB)

N = Result Operand (MSB)

= Not Result Operand (MSB)

Z =

Λ… Λ

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

False

0001

High

0010

Low or Same

0011

C V Z

CC(HI)

Carry Clear

0100

CS(LO)

Carry Set

0101

Not Equal

0110

Equal

0111

Overflow Clear

1000

Overflow Set

1001

Plus

1010

Minus

1011

Greater or Equal

1100

N Λ V V

Less Than

1101

N Λ

Λ V

Greater Than

1110

N Λ V Λ

Less or Equal

1111

Z V N Λ

Λ V

NOTES:

N = Logical Not N

V = Logical Not V

Z = Logical Not Z

*Not available for the Bcc instruction.

MOTOROLA

M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL

3-19

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