Renesas R8C/Tiny Series Software Manual page 129

Chapter 3 Functions
ROT
[ Syntax ]
ROT.size src,dest
[ Operation ]
[ Function ]
• This instruction rotates
(MSB) is transferred to MSB(LSB) and the C flag.
• The direction of rotate is determined by the sign of
are rotated right.
src
• If is an immediate, the number of rotates is –8 to –1 and +1 to +8. You cannot set values less than –8,
equal to 0, or greater than +8.
src
• If is a register and you selected (.B) for the size specifier (.size), the number of rotates is –8 to +8.
Although you can set 0, no bits are rotated and no flags are changed. If you set a value less than –8 or
greater than +8, the result of rotation is indeterminate.
src
• If is a register and you selected (.W) for the size specifier (.size), the number of rotates is –16 to +16.
Although you can set 0, no bits are rotated and no flags are changed. If you set a value less than –16 or
greater than +16, the result of rotation is indeterminate.
[ 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
src
*1 If is R1H, you cannot choose R1 or R1H for
*2 The range of values that can be taken on is –8 < #IMM < +8. However, you cannot set 0.
[ Flag Change ]
Flag
U I O
Change
Conditions
S : The flag is set when the operation resulted in MSB = 1; otherwise cleared.
Z : The flag is set when the operation resulted in 0; otherwise cleared.
C : The flag is set when the bit shifted out last is 1; otherwise cleared.
[ Description Example ]
ROT.B #1,R0L
ROT.B #–1,R0L
ROT.W R1H,R2
[ Related Instructions ]
B , W
C
MSB
dest
left or right the number of bits indicated by
src
R1L/R2 R1H
[A0] [A1]
dsp:8[SB] dsp:8[FB]
dsp:16[SB] abs16
abs20 #IMM
A1A0
B S Z D C
ROLC,RORC,SHA,SHL
Rotate
ROTate
[ Instruction Code/Number of Cycles ]
srcÅÉ0
LSB
dest
srcÅÑ0
src src
. If is positive, bits are rotated left; if negative, bits
*1
/R3 R0L/R0 R0H/R1
A0/A0 A1/A1
dsp:8[A0] dsp:8[A1]
dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16
*2 dsp:20[A0] dsp:20[A1] abs20
R2R0 R3R1
dest
.
*1 If the number of rotates is 0, no flags are changed.
; Rotated left
; Rotated right
112
3.2
C
src
. The bit overflowing from LSB
dest
*1
R1L/R2 R1H/R3
[A0] [A1]
dsp:8[SB] dsp:8[FB]
A1A0
Functions
ROT
Page=220
*1