Chapter 10 XGATE (S12XGATEV3)
MC9S12XE-Family Reference Manual , Rev. 1.19
Freescale Semiconductor
443
Operation
n
= RS or IMM4
Rotates the bits in register RD
n
positions to the right. The upper
n
bits of the register RD are filled with
the lower
n
bits. Two source forms are available. In the first form, the parameter
n
is contained in the
instruction code as an immediate operand. In the second form, the parameter is contained in the lower bits
of the source register RS[3:0]. All other bits in RS are ignored. If
n
is zero no shift will take place and the
register RD will be unaffected; however, the condition code flags will be updated.
CCR Effects
Code and CPU Cycles
ROR
Rotate Right
ROR
N
Z
V
C
∆
∆
0
—
N:
Set if bit 15 of the result is set; cleared otherwise.
Z:
Set if the result is $0000; cleared otherwise.
V:
0; cleared.
C:
Not affected.
Source Form
Address
Mode
Machine Code
Cycles
ROR RD, #IMM4
IMM4
0
0
0
0
1
RD
IMM4
1
1
1
1
P
ROR RD, RS
DYA
0
0
0
0
1
RD
RS
1
0
1
1
1
P
RD
n
bits
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages
