Renesas R8C/Tiny Series Software Manual page 60

Chapter 3 Functions
ADD
[ Syntax ]
ADD.size (:format)
[ Operation ]
dest dest +
[ Function ]
• This instruction adds
dest
• If is A0 or A1 and the selected size specifier (.size) is (.B),
src
in 16 bits. If
dest
• If is a stack pointer and the selected size specifier (.size) is (.B),
calculation in 16 bits.
[ Selectable src/dest ]
R0L/R0 R0H/R1
A0/A0 *1 A1/A1 *1
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
*2 The operation is performed on the stack pointer indicated by the U flag. Only #IMM can be selected for
[ Flag Change ]
Flag U I O
Change
Conditions
O : The flag is set when a signed operation results in a value exceeding +32767 (.W) or –32768 (.W)
or +127 (.B) or –128 (.B); otherwise cleared.
S : The flag is set when the operation results in MSB = 1; otherwise cleared.
Z : The flag is set when the operation results in 0; otherwise cleared.
C : The flag is set when an unsigned operation results in a value exceeding +65535 (.W) or +255 (.B);
otherwise cleared.
[ Description Example ]
ADD.B A0,R0L
ADD.B R0L,A0
ADD.B Ram:8[SB],R0L
ADD.W #2,[A0]
[ Related Instructions ]
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Add without carry
src,dest
src
dest src
and and stores the result in
is A0 or A1, the operation is performed on the eight low-order bits of A0 or A1.
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
ADC, ADCF, SBB, SUB
page 42 of 263
ADDition
[ Instruction Code/Number of Cycles ]
G , Q , S (Can be specified)
B , W
dest
src
(See next page for
R0L/R0 R0H/R1
A0/A0 *1 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 A0 and R0L are added.
; R0L is zero-expanded and added to A0.
3.2
.
is zero-expanded to perform calculation
src
is sign extended to perform
src /dest
classified by format.)
dest
R1L/R2 R1H/R3
*1 [A0] [A1]
dsp:8[SB] dsp:8[FB]
SP/SP
A1A0
src dest
and simultaneously.
Functions
ADD
Page: 140
*2
src .