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12
P4.3
13
P3.1/TXD
14
P3.2/INT0
15
P3.3/INT1
16
P3.4/T0
17
P3.5/T1
18
P3.6/WR
19
P3.7/RD
20
XTAL2
21
XTAL1
22
VSS
23
P4.0
24
P2.0/A8
25
P2.1/A9
26
P2.2/A10
27
P2.3/A11
28
P2.4/A12
29
P2.5/A13
30
P2.6/A14
31
P2.7/A15
32
PSEN
33
ALE
34
P4.1
35
EA
36
P0.7/AD7
37
P0.6/AD6
38
P0.5/AD5
39
P0.4/AD4
40
P0.3/AD3
41
P0.2/AD2
42
P0.1/AD1
43
P0.0/AD0
44
VDD
Bit 3 of port 4
Bit 1 of port 3 & Transmit data
Bit 2 of port 3 & low true interrupt 0
Bit 3 of port 3 & low true interrupt 1
Bit 4 of port 3 & Timer 0
Bit 5 of port 3 & Timer 1
Bit 6 of port 3 & ext. memory write
Bit 6 of port 3 & ext. memory read
Crystal out
Crystal in
Sink voltage, ground
Bit 0 of port 4
Bit 0 of port 2 & bit 8 of external memory address
Bit 1 of port 2 & bit 9 of external memory address
Bit 2 of port 2 & bit 10 of external memory address
Bit 3 of port 2 & bit 11 of external memory address
Bit 4 of port 2 & bit 12 of external memory address
Bit 5 of port 2 & bit 13 of external memory address
Bit 6 of port 2 & bit 14 of external memory address
Bit 7 of port 2 & bit 15 of external memory address
Program storage enable
Address latch enable
Bit 1 of port 4
External access
Bit 7 of port 0 & data/address bit 7 of external
memory
Bit 6 of port 0 & data/address bit 6 of external
memory
Bit 5 of port 0 & data/address bit 5 of external
memory
Bit 4 of port 0 & data/address bit 4 of external
memory
Bit 3 of port 0 & data/address bit 3 of external
memory
Bit 2 of port 0 & data/address bit 2 of external
memory
Bit 1 of port 0 & data/address bit 1 of external
memory
Bit 0 of port 0 & data/address bit 0 of external
memory
Drive voltage
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