ZiLOG Z8 Technical Manual

CP
Compare
CP dst,src
Instruction Foraat:
OPC
OPC
OPC
Operation:
Flags:
Example:
Note:
5-14
OPC
Address Mode
Cycles
(Hex)
dst arc
6 A2
r r
A3
r
Ir
I
I
dst
src
dst
10 A4
R
R
AS R IR
I
I
src
I
I
10 A6
R 1M
A7 IR 1M
I
I
dst
I
I
src
dst - src
The source operand is compared to (subtracted from) the destination operand, and the
appropriate flags set accordingly. The contents of both operands are unaffected by
the comparison.
C: Cleared if there is a carry from the most significant bit of the result; set
otherwise, indicating a "borrow"
Z: Set if the result is zero; cleared otherwise
V: Set if arithmetic overflow occurs; cleared otherwise
5: Set if the result is negative; cleared otherwise
H: Unaffected
D: Unaffected
If the register named TEST contains %63, working register 0 contains %30 (48
decimal), and register 48 contains %63, the statement
CP TEST, ~RO
sets (only) the Z flag. If this statement is followed by "JP EQ, true_routine", the
jump is taken.
When used to specify a 4-bit working-register address, address modes R or IR use the
format:
E
src/dst

ZiLOG Z8 Specifications

General

Brand	ZiLOG
Model	Z8
Category	Desktop
Language	English