Renesas R8C/Tiny Series Software Manual page 111

Chapter 3 Functions
MUL
[ Syntax ]
MUL.size src,dest
[ Operation ]
dest dest
[ Function ]
• This instruction multiplies
• If you selected (.B) for the size specifier (.size),
result is stored in 16 bits. If you specified an A0 or A1 for either
the 8 low-order bits of A0 or A1.
• If you selected (.W) for the size specifier (.size),
result is stored in 32 bits. If you specified R0, R1, or A0 for
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 you specify (.B) for the size specifier (.size), you cannot choose A0 or A1 for
neously.
[ Flag Change ]
Flag U I O
Change
[ Description Example ]
MUL.B A0,R0L
MUL.W #3,R0
MUL.B R0L,R1L
MUL.W A0,Ram
[ Related Instructions ]
Signed multiply
B , W
src
src dest
and together including the sign bits and stores the result in
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,MULU
MULtiple
[ Instruction Code/Number of Cycles ]
src dest
and both are operated on in 8 bits and the
src
src dest
and both are operated on in 16 bits and the
dest
, the result is stored in R2R0, R3R1, or
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
; R0L and A0's 8 low-order bits are multiplied.
94
3.2 Functions
MUL
dest
or , operation is performed on
dest
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
A1A0
src dest
and
Page=203
dest
.
simulta-