dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 448

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

Class II Example:
Explanation of the Class II Example: Prior to execution, the 24-bit registers X0 and Y0
contain $400000 and $600000, respectively. The 56-bit accumulators A and B contain
the values $00:000000:000000 and $FF:7FFFFF:000000, respectively. The 24-bit X
memory location X:$1234 contains the value $000000, and the 16-bit R1 register con-
tains the value $1234. Execution of the parallel move portion of the instruction
(B,X:(R1)+X0,B) moves the 24-bit limited value of B ($800000) into the X:$1234 memory
location and the X0 register ($400000) into accumulator B1 ($400000), sign extends B1
into B2 ($00), and zero fills B0 ($000000). It also increments R1 to $1235.
A - 182
X:R
X:$1234
MAC X0,Y0,A B,X:(R1)+ X0,B
X0
Y0
R1
A
B
:
:
Before Execution
$FF:7FFFFF:000000
$00:000000:000000
Freescale Semiconductor, Inc.
For More Information On This Product,
X Memory and Register Data Move
INSTRUCTION DESCRIPTIONS
$400000
$600000
$000000
INSTRUCTION SET DETAILS
$1234
Go to: www.freescale.com
X:$1234
;multiply X0 and Y0 and accumulate in A
;move B to X memory location pointed to
;by R1 and postincrement R1
;move X0 to B
R1
X0
Y0
A
B
After Execution
$00:300000:000000
$00:400000:000000
$400000
$600000
$800000
$1235
MOTOROLA
X:R