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]8S
3.3 INSTRUCTION OF
OP
CODES AND EXECUTION TIMES
The following section
gives a summary of
the Z-80 instructions
set.
The instructions are
logically
arranged into
groups as shown
on tables 3.3-1 through 3.3-1
1
.
Each table shows the assembly language mnemonic OP code, the actual
OP code, the
symbolic operation, the
content
of the Hag register following the
execution
of
each
instruction,
the num¬
ber
of
bytes required for each instruction
as
well
as the
number of
memory
cycles and the total number of T
states
(external
clock periods) required for the fetching
and execution
of each
instruction.
All
instruction OP
codes
are
listed in binary notation. Single byte OP codes require
two
hex characters while
double
byte OP
codes require four hex characters. The
conversion
from binary
to
hex is
repeated here for convenience.
Binary
Hex
Decimal
0000
0
0
0001
1
1
0010
2
O
0011
3
3
0100
4
4
0101
5
5
0110
6
6
0111
7
7
1000
8
8
1001
9
9
1010
A
10
1011
B
11
1100
C
12
1101
D
13
1110
E
14
ini
F
15
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