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2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)
Conversion Instructions
2
NEG
NEG
Applicable Program Areas
Operands
Operand Specifications
Flags
Function
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.
Instruction Mnemonic Variations
Function
code
Function
2’S COMPLEMENT NEG @NEG 160
Calculates the 2’s complement of a word of hexa-
decimal data.
Symbol
NEG
Area Step program areas Subroutines Interrupt tasks
Usage OK OK OK
Operand Description Data type Size
S Source word WORD 1
R Result word UINT 1
Area
Word addresses Indirect DM addresses
Constants CF Pulse bits TR bits
CIO WR HR AR T C DM @DM *DM
S
OK OK OK OK OK OK OK OK OK
OK
--- --- ---
R ---
Name Label Operation
Error Flag P_ER OFF
Equals Flag P_EQ • ON if the result is 0000/0000 0000.
• OFF in all other cases.
Negative Flag P_N • ON if bit 15 of the result is ON.
• OFF in all other cases.
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.
S: Source word
R: Result word
NEG(160)
S
R
(S) (R)
2’s complement
(Complement + 1)