Infineon Technologies C166S V2 User Manual page 281

NEGB
Group
Syntax
Source Operand(s)
Destination Operand(s)
Operation
(op1) ← 0 - (op1)
Description
Performs a binary 2s complement of the source operand specified by op1. The result is
then stored in op1.
CPU Flags
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, i.e. the result cannot be
represented in the byte 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.
Encoding
Mnemonic
NEGB Rb
User Manual
Integer Two's Complement
Arithmetic Instructions
NEGB op1
op1 → BYTE
op1 → BYTE
E Z
* *
n
Detailed Instruction Description
V C
* *
Format
A1 n0
8-281
User Manual
C166S V2
NEGB
N
*
Bytes
2
V 1.7, 2001-01