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FIELD
SH (16–20)
This field is used to specify a shift amount.
SIMM (16–31)
This immediate field is used to specify a 16-bit signed integer.
SR (12–15)
This field is used to specify one of the 16 segment registers.
TO (6–10)
This field is used to specify the conditions on which to trap.
UIMM (16–31)
This immediate field is used to specify a 16-bit unsigned integer.
XO (21–30, 22–30,
Extended opcode field.
26–30)
B.4 NOTATIONS AND CONVENTIONS
The operation of some instructions is described by a semiformal language or pseudocode.
The table below contains a list of pseudocode notations and conventions used throughout
this appendix.
NOTATION/
CONVENTION
←
Assignment
←
Assignment of an instruction effective address.
iea
¬
NOT logical operator
∗
Multiplication
÷
Division (yielding quotient)
+
Two's-complement addition
–
Two's-complement subtraction, unary minus
=, ≠
Equals and Not Equals relations
<, ≤ , >, ≥
Signed comparison relations
. (period)
Update. When used as a character of an instruction mnemonic, a period (.) means that the
instruction updates the condition register field.
c
Carry. When used as a character of an instruction mnemonic, a 'c' indicates a carry out in
XER[CA].
e
Extended Precision.
When used as the last character of an instruction mnemonic, an 'e' indicates the use of
XER[CA] as an operand in the instruction and records a carry out in XER[CA].
o
Overflow. When used as a character of an instruction mnemonic, an 'o' indicates the
record of an overflow in XER[OV] and CR0[SO] for integer instructions.
<U, >U
Unsigned comparison relations
?
Unordered comparison relation
&, |
AND, OR logical operators
||
Used to describe the concatenation of two values (that is, 010 || 111 is the same as
010111)
⊕ , ≡
Exclusive-OR, Equivalence logical operators (for example, (a
MOTOROLA
DESCRIPTION
DEFINITION
MPC823e REFERENCE MANUAL
MPC823e Instruction Set
∫
≈
b) = (a
¬ b))
B-3
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