mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 1299

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

MPC823 Instruction Set—subf
subf
Assembler Syntax
Definition
Operation
Description
FIELD
FIELD
BIT
BIT
16
0
17
1
18
B
2
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31
sub
For More Information On This Product,
19
3
subf.
subfo
subfo.
is preferred for subtraction because it sets few status bits.
Other registers altered:
Simplified mnemonics:
subf
Subtract From
rD
The sum ¬ (rA) + (rB) + 1 is placed into rD. The subf instruction
POWERPC ARCHITECTURE
20
MPC823 REFERENCE MANUAL
4
¬ (rA) + (rB) + 1
Condition Register (CR0 field):
Affected: LT, GT, EQ, SO (if Rc = 1)
XER:
Affected: SO, OV (if OE = 1)
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rD,rA,rB
OE
21
5
LEVEL
UISA
rD,rA,rB (OE = 0 Rc = 0)
rD,rA,rB (OE = 0 Rc = 1)
rD,rA,rB (OE = 1 Rc = 0)
22
rD,rA,rB (OE = 1 Rc = 1)
6
23
7
equivalent to
24
D
8
25
9
SUPERVISOR
10
26
40
11
27
subf
OPTIONAL
12
28
13
29
rD,rB,rA
A
MOTOROLA
14
30
FORM
XO
RC
15
31