
IMAC
SC140 DSP Core Reference Manual A-181
–5 $FFFB
x 3
$0003
–15 $000F
+8
$0008
–7 $FFF9
Example 2
imac -d4,d5,d6
–42 $002A
x 11 $000B
–462 $FE32
+4096
$1000
3,634 $0E32
Instruction Formats and Opcodes
Note: ** indicates serial grouping encoding.
Instruction Fields
k Accumulation Notation
Register/Memory Address Before After
D4
$00 1022 002A
D5
$FF FF3A 000B
L6:D6
$0:$00 0000 1000 $0:$00 0000 0E32
EMR
$0000 0000 $0000 0000
Instruction Words Cycles Type Opcode
15 8 7 0
IMAC ±Da,Db,Dn 1 1 1 0*1010FFFk0JJJJJ
15 8 7 0
IMAC ±Da,Da,Dn 1 1 1 0*1010FFF110k1 j j
0 add 1 subtract
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