Motorola DSP56000, 24-Bit Digital Signal Processor manual XY Memory Data Move Example, Mpyr X1,Y0,A

INSTRUCTION DESCRIPTIONS

	X: Y:	XY Memory Data Move	X: Y:
Example:
:
	MPYR X1,Y0,A	X1,X:(R0)+ Y0,Y:(R4)+N4	;X1∗Y0 ➞ A,save X1 and Y0
:

X1

Before Execution

$123123

X1

After Execution

$123123

Y0

$456456

Y0

$456456

R0

$1000

R0

$1001

R4

$0100

R4

$0123

N4

$0023

N4

$0023

X:$1000

$000000

X:$1000

$123123

Y:$0100

$000000

Y:$0100

$456456

Explanation of Example: Prior to execution, the 24-bit X1 register contains the value $123123, the 24-bit Y0 register contains the value $456456, the 16-bit R0 address regis- ter contains the value $1000, the 16-bit R4 address register contains the value $0100, the 16-bit N4 address offset register contains the value $0023, the 24-bit X memory loca- tion X:$1000 contains the value $000000, and the 24-bit Y memory location Y:$0100 contains the value $000000. The execution of the parallel move portion of the instruction, X1,X:(R0)+ Y0,Y:(R4)+N4, moves the 24-bit value in the X1 register into the 24-bit X memory location X:$1000 using the 16-bit R0 address register, moves the 24-bit value in the Y0 register into the 24-bit Y memory location Y:$0100 using the 16-bit R4 address register, updates the 16-bit value in the R0 address register, and updates the 16-bit R4 address register using the 16-bit N4 address offset register. The contents of the N4 address offset register are not affected.

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 data limiting has occurred during parallel move.

MOTOROLA INSTRUCTION SET DETAILS A - 203