dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 495
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dsp56000
Manufacturer Part Number
dsp56000
Description
24-bit Digital Signal Processor Family Manual
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSP56000.pdf
(637 pages)
- Current page: 495 of 637
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Explanation of Example 1: Prior to execution, the 24-bit X1 register contains the value
$800000 (–1.0), the 24-bit Y1 register contains the value $C00000, (–0.5), and the 56-bit
A accumulator contains the value $00:000000:000000 (0.0). The execution of the MPY –
X1,Y1,A instruction multiples the 24-bit signed value in the X1 register by the 24-bit
signed value in the Y1 register, negates the 48-bit product, and stores the result in the
56-bit A accumulator (–X1 Y1=–0.5=$FF:C00000:000000=A).
Condition Codes:
S — Computed according to the definition in A.5 CONDITION CODE COMPUTATION
L — Set if limiting occurred during parallel move
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 overflow has occurred in A or B result
Note: The definitions of the E and U bits vary according to the scaling mode being used.
Refer to Section A.5 CONDITION CODE COMPUTATION for complete details.
Instruction Format 1:
Opcode 1:
MOTOROLA
MPY
MPY
MPY ( S1,S2,D
MPY ( S2,S1,D
23
15
LF
DM
14
13
T
DATA BUS MOVE FIELD
Freescale Semiconductor, Inc.
12
**
For More Information On This Product,
MR
OPTIONAL EFFECTIVE ADDRESS EXTENSION
INSTRUCTION DESCRIPTIONS
S1
11
INSTRUCTION SET DETAILS
S0
10
Go to: www.freescale.com
Signed Multiply
I1
9
I0
8
S
7
8
L
6
7
1
E
5
Q
U
4
CCR
Q
N
3
Q
Z
4
2
3
d
V
1
k
C
0
0
0
0
A - 229
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