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3.2 Functions
Chapter 3 Functions
NEGate
Two’s complement
[ Syntax ]
NEG.size dest
[ Flag Change ]
[ Description Example ]
[ Related Instructions ] NOT
[ Function ]
NEG NEG
dest
R0L/R0 R0H/R1 R1L/R2 R1H/R3
A0/A0 A1/A1 [A0] [A1]
dsp:8[A0] dsp:8[A1] dsp:8[SB] dsp:8[FB]
dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16
dsp:20[A0] dsp:20[A1] abs20
R2R0 R3R1 A1A0
B , W
[ Operation ]
dest 0 – dest
NEG.B R0L
NEG.W A1
UIOBSZDC
Conditions
O : The flag is set when
dest
before the operation is –128 (.B) or –32768 (.W); otherwise cleared.
S : The flag is set when the operation resulted in MSB = 1; otherwise cleared.
Z : The flag is set when the operation resulted in 0; otherwise cleared.
C : The flag is set when the operation resulted in 0; otherwise cleared.
• This instruction takes the 2’s complement of
dest
and stores the result in
dest
.
[ Instruction Code/Number of Cycles ]
Page=
209
[ Selectable dest ]
Flag
Change
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