Impyuu, Integer multiply, Instruction formats and opcodes instruction fields – Freescale Semiconductor StarCore SC140 User Manual
Page 509: Operation assembler syntax, Impyuu d5,d3,d1
IMPYUU
SC140 DSP Core Reference Manual
A-195
IMPYUU
Integer Multiply
IMPYUU
Unsigned By Unsigned (DALU)
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
impyuu d5,d3,d1
Instruction Formats and Opcodes
Instruction Fields
Da
jjj
Single Source/Destination Data Register
Operation
Assembler Syntax
Da.L * Db.L
→ Dn
IMPYUU Da,Db,Dn
IMPYUU Da,Db,Dn
Performs an unsigned integer multiplication on the 16-bit LP (Da) of one data register and the16-bit LP of
another data register (Db). It then stores the zero-extended 32-bit result in a data register (Dn).
Register Address
Bit Name
Description
Ln
L
Clears the Ln bit in the destination register.
Register/Memory Address
Before
After
D5
$00 0000 0002
D3
$FF FFFF FFFC
L1:D1
$0:$00 0001 FFF8
Instruction
Words Cycles Type
Opcode
15
8
7
0
IMPYUU Da,Db,Dn
2
1
4
0
0
1
1
0
1
1
0
j
j
j
0
0
F
F
F
1
0
0
0
0
0
0
0
0
0
0
0
0
J
J
J
000
D0
010
D2
100
D4
110
D6
001
D1
011
D3
101
D5
111
D7
Note:
This instruction can specify D8-D15 as operands by using a prefix.