Renesas R8C/Tiny Series Software Manual page 145

Chapter 3 Functions
SUB
[ Syntax ]
SUB.size (:format) src,dest
[ Operation ]
dest dest –
[ Function ]
• This instruction subtracts
dest
• If is A0 or A1 and the selected size specifier (.size) is (.B),
operation in 16 bits. If
[ 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 ]
U I O
Flag
Change
Conditions
O : The flag is set when a signed operation results in a value in 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 any value equal to or greater than 0;
otherwise cleared.
[ Description Example ]
SUB.B A0,R0L
SUB.B R0L,A0
SUB.B Ram:8[SB],R0L
SUB.W #2,[A0]
[ Related Instructions ]
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Subtract without borrow
G , S (Can be specified)
B , W
src
src dest
from
src
is A0 or A1, operation is performed on the 8 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, ADD, SBB
page 127 of 263
SUBtract
[ Instruction Code/Number of Cycles ]
and stores the result in
(See next page for
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 A0 and R0L are the objects of the operation.
; Zero-expanded value of R0L and A0 are the objects of the operation.
3.2
dest
.
src
is zero-expanded 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
Functions
SUB
Page: 236
simulta-