Motorola DSP56000 manual Normalize Accumulator Iteration Norm, Condition Codes

INSTRUCTION SET DESCRIPTIONS

NORM

Normalize Accumulator Iteration NORM

cess in the R3 address register. A negative value reflects the number of left shifts performed; a positive value reflects the number of right shifts performed during the nor- malization process.

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

L — Set if overflow has occurred in A or B 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 is changed as a result of a left shift

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:

NORM Rn,D

Opcode:

23 16 15 8 7 0

0 0 0 0 0 0 0 1

1 1 0 1 1 R R R 0 0 0 1 d 1 0 1

Instruction Fields:
D d		Rn	R R R
A	0	Rn	n n n
B	1

where “nnn” = Rn number

Timing: 2 oscillator clock cycles

Memory: 1 program word

MOTOROLA INSTRUCTION SET DETAILS A - 241