Impysu, Integer multiply, Operation assembler syntax – Freescale Semiconductor StarCore SC140 User Manual
Page 507
IMPYSU
SC140 DSP Core Reference Manual
A-193
IMPYSU
Integer Multiply
IMPYSU
Signed By Unsigned (DALU)
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
impysu d3,d5,d1
Operation
Assembler Syntax
Da.H * Db.L
→ Dn
IMPYSU Da,Db,Dn
IMPYSU Da,Db,Dn
Performs a signed integer multiplication on the signed 16-bit HP of one source data register (Da) and the
unsigned 16-bit LP of a second source data register (Db). It then stores the sign-extended 32-bit result in a
destination 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 0122
D3
$FF FFFF FFFF
L1:D1
$0:$FF FFFF FEDE