Renesas R8C/Tiny Series, Software Manual

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95
3.2 Functions
Chapter 3 Functions
src dest
R0L/R0 R0H/R1 R1L/R2 R1H/R3 R0L/R0 R0H/ R1 R1L /R2 R1H/R3
A0/A0 *1 A1/A1 *1 [A0] [A1] A0/A0 *1 A1/A1 [A0] [A1]
dsp:8[A0] dsp:8[A1] dsp:8[SB] dsp:8[FB] dsp:8[A0] dsp:8[A1] dsp:8[SB] dsp:8[FB]
dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16 dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16
dsp:20[A0] dsp:20[A1] abs20 #IMM dsp:20[A0] dsp:20[A1] abs20
R2R0 R3R1 A1A0 R2R0 R3R1 A1A0
MULtiple Unsigned
Unsigned multiply
[ Description Example ]
[ Related Instructions ] DIV,DIVU,DIVX,MUL
[ Syntax ]
MULU.size src,dest
MULU MULU
B , W
[ Operation ]
dest dest src
[ Function ]
MULU.B A0,R0L
; R0L and A0’s 8 low-order bits are multiplied.
MULU.W #3,R0
MULU.B R0L,R1L
MULU.W A0,Ram
U I O B S Z D C
• This instruction multiplies
src
and
dest
together not including the sign bits and stores the result in
dest
.
• If you selected (.B) for the size specifier (.size),
src
and
dest
both are operated on in 8 bits and the
result is stored in 16 bits. If you specified an A0 or A1 for either
src
or
dest
, operation is performed on
the 8 low-order bits of A0 or A1.
• If you selected (.W) for the size specifier (.size),
src
and
dest
both are operated on in 16 bits and the
result is stored in 32 bits. If you specified R0, R1, or A0 for
dest
, the result is stored in R2R0, R3R1, or
A1A0 accordingly.
[ Instruction Code/Number of Cycles ]
Page=205
[ Selectable src/dest ]
*1 If you specify (.B) for the size specifier (.size), you cannot choose A0 or A1 for
src
and
dest
simulta-
neously.
[ Flag Change ]
Flag
Change