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Motorola DSP96002 User Manual

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MOTOROLA

DSP96002 USER’S MANUAL

B-71

Four 8 Bit Packs

Program

ICycles

Words

joinb d0,d1 ;d1 = xxAB 1 1

joinb d2,d3 ;d3 = xxCD 1 1

join d1,d3 ;d3 = ABCD 1 1

--- ---

Totals: 3 3

B.1.38.2

Pack Two 16 Bit Words Into a 32 Bit Word

The following packs two 16 bit words into a single 32 bit word. The words to be packed are right justified in

two separate registers:

d0 = xY d1 = xZ

Two 16 Bit Packs

Program

ICycles

Words

join d0,d1 ;d1 = YZ 1 1

--- ---

T

otals: 1 1

B.1.38.3

Unpack a 32 Bit Word Into Four Sign-extended Bytes

The following unpacks a 32 bit word into four 8 bit sign-extended bytes in separate registers.

Four 8 Bit Unpacks

Program

ICycles

Words

move #data,d3.l ;get data

split d3,d1 ;d1=ssAB, d3=ABCD 1 1

splitb d1,d0 ;d0=sssA, d1=ssAB 1 1

extb d1 ;d1=sssB 1 1

splitb d3,d2 ;d2=sssC 1 1

extb d3 ;d3=sssD 1 1

--- ---

Totals: 5 5

B.1.38.4

Unpack a 32 Bit Word Into Two Sign-extended 16 Bit Words

The following unpacks a 32 bit word into two 16 bit sign-extended 16 bit words.

Two 16 Bit Unpacks

Program

ICycles

Words

move #data,d0.l ;get data

split d0,d1 ;d1=sX, d0=XY 1 1

ext d1 ;d1=sY 1 1

--- ---

Totals: 2 2