Neg - Omron SYSMAC CP Series Instruction & Reference Manual

NEG

Instruction
2'S COMPLEMENT
Symbol
Applicable Program Areas
Area Step program areas
Usage OK
Operands
Operand
S Source word
R Result word
Operand Specifications
Area
CIO WR HR
S
OK OK OK
R
Flags
Name
Error Flag
Equals Flag
Negative Flag
Function
NEG
NEG(160) calculates the 2's complement of S and writes the result
to R. The 2's complement calculation basically reverses the status of
the bits in S and adds 1.
Note The result for 8000 hex will be 8000 hex.
Hint
• This operation (reversing the status of the bits and adding 1) is equivalent to subtracting the content
of S/S+1 and S from 0000/0000 0000.
CP1E CPU Unit Instructions Reference Manual(W483)
Mnemonic Variations
NEG @NEG
Description
Word addresses
AR T C DM
OK OK OK OK
Label
P_ER OFF
P_EQ • ON if the result is 0000/0000 0000.
• OFF in all other cases.
P_N • ON if bit 15 of the result is ON.
• OFF in all other cases.
Function
code
Calculates the 2's complement of a word of hexa-
160
decimal data.
NEG
NEG(160)
S: Source word
S
R: Result word
R
Subroutines
OK
Data type
WORD
UINT
Indirect DM addresses
Constants
@DM *DM
OK
OK OK
---
Operation
2 Instructions
Function
Interrupt tasks
OK
Size
1
1
CF Pulse bits TR bits
--- --- ---
2's complement
(Complement + 1)
(S) (R)
2-189
2