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Bus connections
1. Expansion bus
The pin connections on the expansion bus exactly mirror
the pin numbering on the 40-pin DIL socket. Note that
the pin numbering on the IDC socket is slightly different
to that on a DIL socket which results in the seemingly
odd arrangement of pins on the IDC pin chart.
PICmicro pinout
Bus name
18 Pin
8 Pin
Vpp/MCLR
4
4
Vdd
14
1
Vss
5
8
OCS1
16
2
OCS2
15
3
RA0/AN0
17
RA1/AN1
18
RA2/AN2
1
RA3/AN3
2
RA4
3
RA5/AN4
4
RB0
6
RB1
7
RB2
8
5*
RB3
9
RB4
10
RB5
11
RB6
12
6*
RB7
13
7*
RC0
RC1
RC2
RC3
RC4
RC5
RC6
RC7
RD0
RD1
RD2
RD3
RD4
RD5
RD6
RD7
RE0/AN5
RE1/AN6
RE2/AN7
9
14 Pin
20 Pin
28 Pin
4
4
1
1
1
20
77
20
8 & 19
2
2
9
3
3
10
19
2
18
3
4
4
5
3
6
2
7
21
22
11*
23
24
13
25
12
26
12*
11
27
13*
10
28
10
16
11
9
15
12
8
14
13
7
7
14
6
6
15
5
5
16
8
17
9
18
For the 18, 28 and 40 pin devices the buses on devices
are largely upwards compatible - pin connections on an
18-pin device appear on a 28-pin device and a 40-pin
device, and pins on a 28-pin device appear on a 40-pin
device. This allows the 18, 28 and 40 pin DIL sockets to
be connected in parallel with the PICmicro bus structure
intact.
* This parallel connection is not possible with 8, 14 and
40 Pin
20 pin devices due to programming requirements which
1
means that there are anomalies with the pin connections
11 & 32
for the 8, 14 and 20 pin devices as follows:
12 &31
13
Multiprogrammer port
line
14
RB2
2
RB6
3
RB7
4
5
Multiprogrammer port
line
6
RB2
7
RB6
33
RB7
34
35
Multiprogrammer port
line
36
RB2
37
RB6
38
RB7
39
40
15
16
17
18
23
24
25
26
19
20
21
22
27
28
29
30
8
9
10
Connection pin on 20
20 pin port line
pin device
5
RA2
6
RA1
7
RA0
Connection pin on 14
14 pin port line
pin device
5
RA2
6
RA1
7
RA0
Connection pin on 8
8 pin port line
pin device
1
RA2
12
RA1
13
RA0
Copyright © 2014 Matrix Technology Solutions Ltd
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