Zilog EZ80F916 - Manual (Page 257)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
248
NEG
Negate Accumulator
Operation
A  0 – A
Description
The contents of the accumulator, A, are negated (two’s-complemented) and are identical to
a subtraction of the accumulator from 0.
Condition Bits Affected
Attributes
S
Set if result is negative; reset otherwise.
Z
Set if result is 0; result otherwise.
H
Set if borrow from bit 4; reset otherwise.
P/V
Set if accumulator contained 80h before operation; reset
otherwise.
N
Set.
C
Set if accumulator was not 00h before operation; reset
otherwise.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
NEG
X 2
EE, 44