Motorola DSP56000, 24-Bit Digital Signal Processor manual Condition Codes, Adc S,D

INSTRUCTION DESCRIPTIONS

ADC

Add Long with Carry

ADC

result. The actual 96-bit result is stored in memory using the A10 and B10 operands (instead of A and B) because shifting and limiting is not desired.

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 limiting (parallel move) or overflow has occurred in 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 overflow has occurred in A or B result

C — Set if a carry (or borrow) occurs from bit 55 of 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 for complete details.

Instruction Format:

ADC S,D

Opcode:

23		8	7	4	3	0
	DATA BUS MOVE FIELD		0 0 1	J	d	0 0 1
	OPTIONAL EFFECTIVE ADDRESS EXTENSION

Instruction Fields:

S,D	J d
X,A	0 0
X,B	0 1
Y,A	1 0
Y,B	1 1

Timing: 2+mv oscillator clock cycles

Memory: 1+mv program words

MOTOROLA INSTRUCTION SET DETAILS A - 25