ZiLOG Z8 Technical Manual

DEC dst
Instruction roraat:
Cycles
OPC
(Hex)
DEC
Decrement
Address Mode
dst
~ ______ O_PC ______ ~II ~ _______ d_s_t ______ ~
6 00
01
R
IR
Operation:
Hags:
EX8llllple:
Note:
dst <-- dst - 1
The destination operand's contents are decremented by one.
c: Unaffected
Z: Set if the result is zero; cleared otherwise
V: Set if arithmetic overflow occurred; cleared otherwise
5: Set if the result is negative; cleared otherwise
H: Unaffected
D: Unaffected
If working register 10 contains ~2A, the statement
DEC R10
leaves the value %29 in that register. The Z, V, and S flags are cleared.
When used to specify a 4-bit working-register address, address modes R or IR use the
format:
E dst
5-17

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English