Renesas R8C/Tiny Series Software Manual page 150

Chapter 3 Functions
XCHG
[ Syntax ]
XCHG.size src,dest
[ Operation ]
dest src
[ Function ]
• This instruction exchanges the contents of
dest
• If is A0 or A1 and the selected size specifier (.size) is (.B), the content of
16 bits and placed in A0 or A1, and the 8 low-order bits of A0 or A1 are placed in
[ Selectable src/dest ]
R0L/R0 R0H/R1
A0/A0 A1/A1
dsp:8[A0] dsp:8[A1]
dsp:16[A0] dsp:16[A1]
dsp:20[A0] dsp:20[A1]
R2R0 R3R1
[ Flag Change ]
Flag U I O
Change
[ Description Example ]
XCHG.B R0L,A0
XCHG.W R0,A1
XCHG.B R0L,[A0]
[ Related Instructions ]
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
src
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
dsp:16[SB] abs16
abs20 #IMM
A1A0 [A1A0]
B S Z D C
; 8 low-order bits of A0 and the zero-expanded value of R0L are exchanged.
MOV, LDE, STE
page 132 of 263
Exchange
eXCHanGe
[ Instruction Code/Number of Cycles ]
B , W
src dest
and .
R0L/R0 R0H/R1
A0/A0 A1/A1
dsp:8[A0] dsp:8[A1]
dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16
dsp:20[A0] dsp:20[A1] abs20
R2R0 R3R1
3.2 Functions
XCHG
Page: 242
src
is zero-expanded to
src
.
dest
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
A1A0