Intel MCS48 User Manual page 338

8259A
A
o
o,
C
«
<\
D
4
0,
D, D,
°0
A,
*«
S
1
LTIM
F S
IC4
1
ICW4
NEEDED
0= NO
ICW4
NEEDED
1
1
-
SINGLE
0-
NOT SINGLE
CALL ADDRESS INTERVAL
1
-
INTERVAL OF
4
0- INTERVAL OF
8
1
-
LEVEL TRIGGERED INPUT
=
EDGE TRIGGERED INPUT
A
7
-
A5OF LOWER
ROUTINE ADDRESS
(MCS 80/8S
MODE
ONLY)
A D
C
C
°i
c
4
3
D
2
D,
°b
1
A
,s
A
14
A
13
*.2
A
11
A
10
S
A
.
UPPER ROUTINE
ADDRESS
ICW3 (MASTER DEVICE)
A
o
D
6
°»
D
4
3
°2
D
.
°b
1
S,
h %
S, S3 s, s,
So
1
> IR
INPUT
HAS A SLAVE
' IR
INPUT
DOES NOT HAVE
A SLAVE
ICW3 (SLAVE DEVICE)
0$
D
4 3
D
2
1
ID,
ID,
ID
SLAVE
IDI'
1
2 3 4
s 6
7
1 1 1 1
1 1
1 1
1 1 1
1
AO
D7
06
D5 D
4
D3
02
D
1
DO
1
FNM BUF M/S AEOI
„FM
1
=
MCS
86
MODE
--
MCS
80/85
MODE
1
AUTO
EOI
0>
NORMAL
EOI
- NON BUFFERED MODE
-
BUFFERED MODE/SLAVE
- BUFFERED MODE/MASTER
1
X
1 1
1
-
FULLY NESTED
MODE
NOT
F
JLLY
NESTED MODE
NOTE
1:
SLAVED
ID IS
EQUAL TO THE CORRESPONDING MASTER
IR
INPUT.
NOTE
2:
X
INDICATED 'DON'T
CARE"
Initialization
Command
Word Format
8-48