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MAC
Condition Codes:
15
14
13
LF
DM
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
23
Instruction Fields:
∗
S1
S2
Q Q Q
X0 X0
0 0 0
Y0 Y0
0 0 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
MOTOROLA
INSTRUCTION DESCRIPTIONS
Signed Multiply-Accumulate
12
11
10
9
T
S1
S0
I1
**
MR
DATA BUS MOVE FIELD
OPTIONAL EFFECTIVE ADDRESS EXTENSION
Sign
+
–
∗
S2 combinations are valid. X1
INSTRUCTION SET DETAILS
8
7
6
5
4
I0
S
L
E
U
CCR
8
7
1
Q
Q
k
D d
0
A 0
1
B 1
∗
X1 and Y1
MAC
3
2
1
0
N
Z
V
C
4
3
0
d
k
1
0
Q
∗
Y1 are not valid.
A - 151
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