M166 Datasheet, PDF (88/127 Pages) Siemens Semiconductor Group – C16x Family of Siemens 16-Bit CMOS Single-Chip Microcontrollers

30Mar98@15:00h
C166 Family Instruction Set
Instruction Description
NEG
Integer Two’s Complement
NEG
Syntax
Operation
Data Types
Description
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.
Condition Flags
E
Z
V
C
N
*
*
*
S
*
Addressing Modes
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
Format
81 n0
Bytes
2
Semiconductor Group
88
Version 1.2, 12.97