Impy.w, Signed immediate integer multiply (dalu), Operation assembler syntax – Freescale Semiconductor StarCore SC140 User Manual
Page 503
IMPY.W
SC140 DSP Core Reference Manual
A-189
IMPY.W
Signed Immediate Integer Multiply (DALU)
IMPY.W
Description
Status and Conditions that Affect Instruction
None.
Status and Conditions Changed by Instruction
Example
impy.w #$fffe,d3
Operation
Assembler Syntax
#s16 * Dn.L
→ Dn
IMPY.W #s16,Dn {–2
15
≤ s16 < 2
15
}
IMPY.W #s16,Dn
Performs a signed integer multiplication on the low portion of a source data register (Dn) and an immediate
signed 16-bit word. It then stores the 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
immediate
$FFFE
d3
$00 7FFF FFF8
$00 0000 0010