INSTRUCTION DESCRIPTIONS
MOTOROLA INSTRUCTION SET DETAILS A - 151
Condition Codes:
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
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 1:
MAC (±)S1,S2,D
MAC (±)S2,S1,D
Opcode: 1
Instruction Fields:
S1∗S2 Q Q Q Sign k D d
X0 X0 0 0 0 + 0 A 0
Y0 Y0 0 0 1 – 1 B 1
X1 X0 0 1 0
Y1 Y0 0 1 1
X0 Y1 1 0 0
Y0 X0 1 0 1
X1 Y0 1 1 0
Y1 X1 1 1 1
Note: Only the indicated S1∗S2 combinations are valid. X1∗X1 and Y1∗Y1 are not valid.
MAC Signed Multiply-Accumulate MAC
MR CCR
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
LF DM T ** S1 S0 I1 I0 SLEUNZVC
23 8 7 4 3 0
DATA BUS MOVE FIELD 1QQQdk10
OPTIONAL EFFECTIVE ADDRESS EXTENSION