INSTRUCTION DESCRIPTIONS

ASL

Arithmetic Shift Accumulator Left

ASL

Condition Codes:

15

14

 

13

12

11

10

9

8

7

6

 

5

4

3

2

1

0

LF

DM

T

**

 

S1

S0

 

I1

I0

S

L

E

U

N

Z

 

V

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MR

 

 

 

 

 

 

 

 

 

 

CCR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S — Computed according to the definition in A.5 CONDITION CODE COMPUTATION L — Set if limiting (parallel move) or overflow has occurred in result

E — Set if the signed integer portion of A or B result is in use U — Set if A or B result is unnormalized

N — Set if bit 55 of A or B result is set

Z— Set if A or B result equals zero

V — Set if bit 55 of A or B result is changed due to left shift

C — Set if bit 55 of A or B was set prior to instruction execution

Note: The definitions of the E and U bits vary according to the scaling mode being used. Refer to Section A.5 for complete details.

Instruction Format:

ASL D

Opcode:

 

23

 

8

7

4

3

0

 

 

 

 

 

 

 

 

 

 

 

 

DATA BUS MOVE FIELD

 

0 0 1

1

d

0 1 0

 

 

 

 

 

 

 

 

 

 

 

 

OPTIONAL EFFECTIVE ADDRESS EXTENSION

 

 

 

 

 

 

 

 

 

 

 

 

 

Instruction Fields:

D d

A0

B1

Timing: 2+mv oscillator clock cycles

Memory: 1+mv program words

MOTOROLA

INSTRUCTION SET DETAILS

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Motorola DSP56000, 24-Bit Digital Signal Processor manual Asl D