Freescale-semiconductor StarCore SC140 Manual do Utilizador descarregar pdf (Página 96)

100

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2-64 SC140 DSP Core Reference Manual

Memory Interface

2.4.1.6 Memory Access Behavior in Big/Little Endian Modes

Table 2-27 shows the representation of the move instructions in big and little endian modes. In the

examples shown in this table, it is assumed that R0 points to address A0. Each alphanumeric A–H

represents one byte. Also, the memory contents may not exactly equal the register contents. For example,

in VSL instructions, the memory word (16 bits) is the register word shifted left by one bit. See Appendix A

for more detailed information.

Table 2-27. Move Instructions in Big and Little Endian Modes

Instruction Register Operands Big Endian

Little

Endian

MOVE.B

MOVEU.B

A0 = A A0 = A

MOVE.W

MOVEU.W

A0 = A

A1 = B

A0 = B

A1 = A

MOVE.2W A0 = A

A1 = B

A2 = C

A3 = D

A0 = B

A1 = A

A2 = D

A3 = C

MOVE.4W A0 = A

A1 = B

A2 = C

A3 = D

A4 = E

A5 = F

A6 = G

A7 = H

A0 = B

A1 = A

A2 = D

A3 = C

A4 = F

A5 = E

A6 = H

A7 = G

MOVE.L

MOVEU.L

MOVES.L

A0 = A

A1 = B

A2 = C

A3 = D

A0 = D

A1 = C

A2 = B

A3 = A

039 8

D0 =

Examp

e: M

VE.B D

(

039

Example: MOVE.W D0, (R0)

D0 =

039 16

Example: MOVE.2W D0:D1, (R0)

D0 =

D1 =

039

Example: MOVE.4W D0:D1:D2:D3, (R0)

D0 =

D1 =

D2 =

D3 =

039 32

Example: MOVE.L D0, (R0)

D0 =

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 759 760

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