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NEG
Syntax
Operation
Data Types
Description
Condition Flags
Addressing Modes
Semiconductor Group
30Mar98@15:00h
Integer Two's Complement
NEG
op1
(op1) ← 0 - (op1)
WORD
Performs a binary 2's complement of the source operand specified by
op1. The result is then stored in op1.
E
Z
*
*
E Set if the value of op1 represents the lowest possible negative number.
Cleared otherwise. Used to signal the end of a table.
Z Set if result equals zero. Cleared otherwise.
V Set if an arithmetic underflow occurred, ie. the result cannot be repre-
sented in the specified data type. Cleared otherwise.
C Set if a borrow is generated. Cleared otherwise.
N Set if the most significant bit of the result is set. Cleared otherwise.
Mnemonic
NEG
Rw
n
C166 Family Instruction Set
V
C
N
*
S
*
Format
81 n0
88
Instruction Description
NEG
Version 1.2, 12.97
Bytes
2
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