Renesas R8C/Tiny Series Software Manual page 88

Chapter 3 Functions
DSBB
[ Syntax ]
DSBB.size src,dest
[ Operation ]
dest dest –
[ Function ]
• This instruction subtracts
stores the result 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 B
Change
Conditions
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 the operation results in any value equal to or greater than 0; otherwise
cleared.
[ Description Example ]
DSBB.B #3,R0L
DSBB.W R1,R0
[ Related Instructions ]
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
Decimal subtract with borrow
Decimal SuBtract with Borrow
____
src – C
src
and the inverted value of the C flag from
dest
.
src
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB] dsp:8[A0]
dsp:16[SB] abs16
abs20 #IMM
A1A0
S Z D C
DADC, DADD, DSUB
page 70 of 263
[ Instruction Code/Number of Cycles ]
B , W
R0L/R0 R0H/R1
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
3.2 Functions
DSBB
Page: 173
dest
as decimal data and
dest
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
A1A0