Freescale-semiconductor StarCore SC140 Manual do Utilizador descarregar pdf (Página 487)

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EXTRACTU

SC140 DSP Core Reference Manual A-173

EXTRACTU Extract Unsigned Bit Field EXTRACTU

(DALU)

Description

These operations extract a bit field from a source data register (Db) and place it in a destination data

zero, this instruction can be used to zero-extend an arbitrary width unsigned integer.

Status and Conditions that Affect Instruction

None.

Status and Conditions Changed by Instruction

Example

extractu #$c,#$e,d2,d4

Operation Assembler Syntax

Db[(offset + width – 1):offset] → Dn[(width – 1):0]

0 → Dn[39:width]

width = #U6; offset = #u6

EXTRACTU #U6,#u6,Db,Dn

{0 ≤ U6 ≤ 40}

{0 ≤ u6 ≤ 40}

{#U6+#u6 ≤ 40}

width = Da[13:8]; offset = Da[5:0]

EXTRACTU Da,Db,Dn

{0 ≤ Da[13:8] ≤ 40}

{0 ≤ Da[5:0] ≤ 40}

{Da[13:8]+Da[5:0] ≤ 40}

EXTRACTU #U6,#u6,Db,Dn

Uses two immediate unsigned 6-bit integers for the width (#U6) and offset (#u6).

EXTRACTU Da,Db,Dn

Uses a supplemental data register (Da) for the width (bits 13:8) and the offset (5:0).

Ln L Clears the Ln bit in the destination register.

immediate (width)

immediate (offset)

$FF 8665 4321

L4:D4

$0:$00 0000 0000 $0:$00 0000 0995

1 2 ... 482 483 484 485 486 487 488 489 490 491 492 ... 759 760

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