Table of Contents
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MCS-48
"
Pin Configurations
P26
C
i
40
J
P27
C
2
39
3
AVccC
3
36
J
Varef
C
4
37
]
AN1
C
5
36
J
ANO
C
6
35
AVssC
7
34
TOC
B
33
VihC
9
32
2
POO
C
10
8022
31
H
P01
C
11
30
D
P02
C
12
29
J
P03
C
13
26
2
P04
C
14
27
t
P05C
16
26
-!
P06
C
16
25,
P07
C
17
20
ALE
C
18
23
TlC
19
22
3
VssC
20
21
J
V C
C
P25
P24
PROG
P23
P22
P21
P20
Pi
7
P16
PIS
P14
P13
P12
P11
P10
RESET
XTAL2
XTAL
1
SUB
ST
P22
C
i
w
28
]
F>23
c
2
27
2
PROG
r:
3
26
2
POO
c
4
25
h
P01
c
5
24
3
PD2
c
6
23
b
P03
c
7
8021
22
2
P04
c
a
21
2
P06
c
9
20
2
P06
c
10
19
-
PC
7
c
11
18
2
ALE
!-
12
17
2
T1
•~
13
16
vss
c
14
15
J
VCC
P21
P20
P17
P16
P15
P14
P13
P12
P11
P10
RESET
XTAL
2
XTAL
1
PROG
AND
CE
C
1
40
: v
cc
CEC
2
39
D
PB
7
CLK
C
3
36
-jps
6
RESET
C
4
37
D
PB
s
V
DnC
5
36
D
PB
4
READY
£
6
35
U
PB
3
io/m
C
34
DPB
2
ior
C
8
33
D
p
Bi
RD
C
9
22
2
p
%
iow
C
10
8355
31
-JPA
7
ALEC
11
8755A
3
D
PA
S
ad
q l:
12
29
I]
PA
6
fl0
lC
13
28
J™4
AD
2[:
14
?:i
D
PA
3
AD
3
E
IB
23
-JPA
2
AD
4
Q
16
25
3™i
AD
5
C
17
Z4
3
PA
o
AD
6[I
IB
23
3 A
io
AD
?C
19
22
DAg
v
ssC
20
21
H
A
8
PCj
C
1
40
2
v
cc
pc„
C
2
39
2
PC
2
TIMER
IN
C
3
36
2
PC,
RESET
C
4
37
U
pc
p
c
s
C
5
36
1
PBj
TIMER
OUT
C
6
3
Si
D
p
e
6
IO/M
C
7
34
2
PB
5
*
c
8
33
"1
PB,
RD
E
9
32
3
PB
3
WR C
10
8155
31
2
PB
?
ALE
C
11
8156
30
H
PB,
AD
C
12
2a
2
pb
AD,
C
13
28
D
PA,
ADj
Q
14
27
H
PA
6
AD
3
C
15
ZS.
3
PA^
AD
4
C
16
25
I]
PA,
AD
5
C
17
24
1
PA
3
AD
6
C
18
23
3PA
2
AD
7
C
19
22
D
pa,
V
SS
C
20
21
3
PA„
8
166"
156
CE
CE
P5t>C
P40C
P41L
P42
C
P43T
csC
progC
P23C
P22C
P21
C
P20C
gndC
8243
24
3V
Cc
23
3P51
22
I)P52
21
^P53
20
It
P60
IS
UP61
IS
2
P62
17
J
P63
11,
"I
P73
15
J
P72
141
"
'J
171
12
DP70
INTEL COfiPOfWTlOH,
197S
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