ZiLOG Z80380 User Manual page 143

Z
ILOG
NEGW [HL]
Operation: HL(15-0)
The contents of the HL register are negated, that is replaced by its two's complement value.
Note that 8000h is, replaced by itself, because in two's complement representation the
negative number with the greatest magnitude has no positive counterpart; for this case, the
Overflow flag is set to 1.
Flags: S: Set if the result is negative; cleared otherwise
Z: Set if the result is zero; cleared otherwise
H: Set if there is a borrow from bit 4 of the result; cleared otherwise
V: Set if the content of the HL register was 8000h before the operation; cleared otherwise
N: Set
C: Set if the content of the HL register was not 0000h before the operation; cleared if the
content of the HL register was 0000h
Addressing
Mode Syntax
NEGW [HL]
DC-8297-03
← -HL(15-0)
Instruction Format
11101101 01010100
NEGATE HL REGISTER (WORD)
Execute
Time
2
™
Z380
U ' M
SER S ANUAL
NEGW
Note
5-109