Mulu - Renesas R8C/Tiny Series Software Manual

Chapter 3 Functions

MULU

[ Syntax ]
MULU.size src,dest
[ Operation ]
dest dest
[ Function ]
• This instruction multiplies
• If (.B) is selected as the size specifier (.size),
and the result is stored in 16 bits. If A0 or A1 is specified as either
performed using the 8 low-order bits of A0 or A1.
• If (.W) is selected as the size specifier (.size),
and the result is stored in 32 bits. If R0, R1, or A0 are specified as
R3R1, or A1A0 accordingly.
[ Selectable src/dest ]
R0L/R0 R0H/R1
*1 *1
A0/A0 A1/A1
dsp:8[A0] dsp:8[A1]
dsp:16[A0] dsp:16[A1]
dsp:20[A0] dsp:20[A1]
R2R0 R3R1
*1 If (.B) is selected as the size specifier (.size), A0 or A1 cannot be chosen for
neously.
[ Flag Change ]
Flag
U I O
Change
[ Description Example ]
MULU.B A0,R0L
MULU.W #3,R0
MULU.B R0L,R1L
MULU.W A0,Ram
[ Related Instructions ]
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Unsigned multiply
MULtiple Unsigned
src
src dest
and
src
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB] dsp:8[A0]
dsp:16[SB] abs16
abs20 #IMM
A1A0
B S Z D C
DIV, DIVU, DIVX, MUL
page 95 of 263
[ Instruction Code/Number of Cycles ]
B , W
without the sign bits and stores the result in
src dest
and are treated as 8-bit data for the operation
src dest
and are treated as 16-bit data for the operation
R0L/R0 R0H/R1
*1
A0/A0 A1/A1
dsp:8[A1]
dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16
dsp:20[A0] dsp:20[A1] abs20
R2R0 R3R1
; 8 low-order bits of R0L and A0 are multiplied.
3.2 Functions
MULU
Page: 205
dest
.
src dest
or , the operation is
dest
, the result is stored in R2R0,
dest
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
A1A0
src dest
and simulta-