ADSP-2104LKP-55 datasheet(10/36 Pages) AD

Part #	ADSP-2104LKP-55

Description	Low Cost DSP Microcomputers

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ADSP-2104/ADSP-2109

–10–

REV. 0

Instruction Set

The ADSP-2104/ADSP-2109 assembly language uses an algebraic

syntax for ease of coding and readability. The sources and

destinations of computations and data movements are written

explicitly in each assembly statement, eliminating cryptic

assembler mnemonics.

Every instruction assembles into a single 24-bit word and

executes in a single cycle. The instructions encompass a wide

variety of instruction types along with a high degree of

operational parallelism. There are five basic categories of

instructions: data move instructions, computational instruc-

tions, multifunction instructions, program flow control instruc-

tions and miscellaneous instructions. Multifunction instructions

perform one or two data moves and a computation.

The instruction set is summarized below. The ADSP-2100

Family Users Manual contains a complete reference to the

instruction set.

ALU Instructions

[IF cond]

AR|AF

=

xop + yop [+ C] ;

Add/Add with Carry

=

xop – yop [+ C– 1] ;

Subtract X – Y/Subtract X – Y with Borrow

=

yop – xop [+ C– 1] ;

Subtract Y – X/Subtract Y – X with Borrow

=

xop AND yop ;

AND

=

xop OR yop ;

OR

=

xop XOR yop ;

XOR

=

PASS xop ;

Pass, Clear

=

– xop ;

Negate

=

NOT xop ;

NOT

=

ABS xop ;

Absolute Value

=

yop + 1 ;

Increment

=

yop – 1 ;

Decrement

=

DIVS yop, xop ;

Divide

=

DIVQ xop ;

MAC Instructions

[IF cond]

MR|MF =

xop * yop ;

Multiply

=

MR + xop * yop ;

Multiply/Accumulate

=

MR – xop * yop ;

Multiply/Subtract

=

MR ;

Transfer MR

=0 ;

Clear

IF MV

SAT MR ;

Conditional MR Saturation

Shifter Instructions

[IF cond]

SR = [SR OR] ASHIFT xop ;

Arithmetic Shift

[IF cond]

SR = [SR OR] LSHIFT xop ;

Logical Shift

SR = [SR OR] ASHIFT xop BY <exp>;

Arithmetic Shift Immediate

SR = [SR OR] LSHIFT xop BY <exp>;

Logical Shift Immediate

[IF cond]

SE = EXP xop ;

Derive Exponent

[IF cond]

SB = EXPADJ xop ;

Block Exponent Adjust

[IF cond]

SR = [SR OR] NORM xop ;

Normalize

Data Move Instructions

reg = reg ;

Register-to-Register Move

reg = <data> ;

Load Register Immediate

reg = DM (<addr>) ;

Data Memory Read (Direct Address)

dreg = DM (Ix , My) ;

Data Memory Read (Indirect Address)

dreg = PM (Ix , My) ;

Program Memory Read (Indirect Address)

DM (<addr>) = reg ;

Data Memory Write (Direct Address)

DM (Ix , My) = dreg ;

Data Memory Write (Indirect Address)

PM (Ix , My) = dreg ;

Program Memory Write (Indirect Address)

Multifunction Instructions

<ALU>|<MAC>|<SHIFT> , dreg = dreg ;

Computation with Register-to-Register Move

<ALU>|<MAC>|<SHIFT> , dreg = DM (Ix , My) ;

Computation with Memory Read

<ALU>|<MAC>|<SHIFT> , dreg = PM (Ix , My) ;

Computation with Memory Read

DM (Ix , My) = dreg , <ALU>|<MAC>|<SHIFT> ;

Computation with Memory Write

PM (Ix , My) = dreg , <ALU>|<MAC>|<SHIFT> ;

Computation with Memory Write

dreg = DM (Ix , My) , dreg = PM (Ix , My) ;

Data & Program Memory Read

<ALU>|<MAC> , dreg = DM (Ix , My) , dreg = PM (Ix , My) ;

ALU/MAC with Data & Program Memory Read

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