Zilog EZ80F916 - Manual (Page 141)

eZ80
®
CPU
User Manual
UM007715-0415 CPU Instruction Set
132
DEC (HL)
Decrement
Operation
(HL)  (HL)–1
Description:
The (HL) operand is an 8-bit value stored at the memory location specified by the contents
of the multibyte register HL. This 8-bit value is decremented by 1.
Condition Bits Affected
Attributes
S
Set if result is negative; reset otherwise.
Z
Set if result is 0; reset otherwise.
H
Set is borrowed from bit 4; reset otherwise.
P/V
Set if operand was 80h before operation; reset otherwise.
N
Set.
C
Not affected.
Mnemonic Operand ADL Mode Cycle Opcode (hex)
DEC
(HL) X 4
35
DEC.S
(HL) 1 5
52, 35
DEC
.L (HL) 0 5
49, 35