mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1271

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

MPC823 Instruction Set—rlwinm
rlwinm
Assembler Syntax
Definition
Operation
Description
Description
FIELD
FIELD
BIT
BIT
16
0
17
1
SH
18
2
Freescale Semiconductor, Inc.
21
For More Information On This Product,
19
3
rlwinm.
r
m
rA
by operand SH. A mask is generated having 1 bits from bit MB
through bit ME and 0 bits elsewhere. The rotated data is ANDed
with the generated mask and the result is placed into rA.
using the methods shown below:
rlwinm
Rotate Left Word Immediate then AND with Mask
n
The contents of rS are rotated left the number of bits specified
rlwinm can be used to extract, rotate, shift, and clear bit fields
20
ROTL(rS,
MPC823 REFERENCE MANUAL
4
SH
MASK(MB, ME)
r & m
To extract an n field, that starts at bit position b in rS,
right-justified into rA (clearing the remaining 32 – n bits
of rA), set SH = b + n, MB = 32 – n, and ME = 31.
To extract an n field, that starts at bit position b in rS, left-
justified into rA (clearing the remaining 32 – n bits
of rA), set SH = b, MB = 0, and ME = n – 1.
To rotate the contents of a register left (or right) by n bits,
set SH = n (32 – n), MB = 0, and ME = 31.
To shift the contents of a register right by n bits, by setting
SH = 32 – n, MB = n, and ME = 31. It can be used to clear
the high-order b bits of a register and then shift the result
left by n bits by setting SH = n, MB = b – n and
ME = 31 – n.
To clear the low-order n bits of a register, by setting
SH = 0, MB = 0, and ME = 31 – n.
Go to: www.freescale.com
21
5
rA,rS,SH,MB,ME (Rc = 0)
rA,rS,SH,MB,ME (Rc = 1)
22
6
n
)
MB
23
7
24
S
8
25
9
10
26
11
27
ME
12
28
13
29
A
MOTOROLA
14
30
RC
15
31