Motorola 24-Bit Digital Signal Processor, DSP56000 XY Memory Data Move Instruction Format, Opcode

INSTRUCTION DESCRIPTIONS

X: Y: XY Memory Data Move X: Y:

Note: The MOVE A,X:<eax> B,Y:<eay> operation will result in one or two 24-bit positive and/or negative saturation constant(s) being stored in the specified 24-bit X and/or Y memory location(s) if the signed integer portion of the A and/or B accumulator(s) is in use.

Instruction Format:

( . . . . . ) X:<eax>,D1 Y:<eay>,D2

( . . . . . ) X:<eax>,D1 S2,Y:<eay>

( . . . . . ) S1,X:<eax> Y:<eay>,D2

( . . . . . ) S1,X:<eax> S2,Y:<eay>

Opcode:

	23	16	15	8	7	0
1 w m m e e f		f	W r	r M M R R R		INSTRUCTION OPCODE

Instruction Fields:

X:<eax>=6-bit X Effective Address=WMMRRR (R0–R3 or R4–R7) Y:<eay>=5-bit Y Effective Address=wmmrr (R4–R7 or R0–R3)

X Effective
Addressing Mode	M M R R R
(Rn)+Nn	0	1	s	s s
(Rn)-	1	0	s	s	s
(Rn)+	1	1	s	s	s
(Rn)	0	0	s	s	s

where “sss” refers to an address register R0–R7

A - 204 INSTRUCTION SET DETAILS MOTOROLA