MO SEL VITELIC
MSU2051/U2031
Pin Descriptions
40 PDIP Dice 44 LQFP 44 PQFP 44 PLCC Symbol
Active I/O
Names
Pin# Pad#
Pin#
40
41
42
43
44
1
Pin#
40
41
42
43
44
1
Pin#
2
1
1
2
P1.0
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i
bit 0 of Port 1
2
3
P1.1
bit 1 of Port 1
3
3
4
P1.2
bit 2 of Port 1
4
4
5
P1.3
bit 3 of Port 1
5
5
6
P1.4
bit 4 of Port 1
6
6
7
P1.5
bit 5 of Port 1
7
7
2
2
8
P1.6
bit 6 of Port 1
8
8
3
3
9
P1.7
bit 7 of Port 1
9
9
4
4
10
11
13
14
15
16
17
18
19
20
21
22
24
25
26
27
28
29
30
31
32
33
35
36
37
38
39
40
41
42
43
44
RES
Reset
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
10
11
12
13
14
15
16
17
18
19
20-22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42,43
5
5
RXD/P3.0
TXD/P3.1
#INT0/P3.2
#INT1/P3.3
T0/P3.4
T1/P3.5
#WR/P3.6
#RD/P3.7
XTAL2
i/o
i/o
bit 0 of Port 3 & Receive data
bit 1 of Port 3 & Transmit data
7
7
L/-
L/-
8
8
i/o
i/o
i/o
i/o
i/o
i/o
o
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
9
9
10
11
12
13
14
15
16
18
19
20
21
22
23
24
25
26
27
29
30
31
32
33
34
35
36
37
38
10
11
12
13
14
15
16
18
19
20
21
22
23
24
25
26
27
29
30
31
32
33
34
35
36
37
38
bit 5 of Port 3 & Timer 1
L/-
L/-
bit 6 of Port 3 & Write (low enable)
bit 7 of Port 3 & Read (low enable)
Crystal out
XTAL1
i
Crystal in
VSS
Sink Voltage, Ground
A8/P2.0
A9/P2.1
A10/P2.2
A11/P2.3
A12/P2.4
A13/P2.5
A14/P2.6
A15/P2.7
#PSEN
ALE
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
o
bit 0 of Port 2 & Address 8
bit 1 of Port 2 & Address 9
bit 2 of Port 2 & Address 10
bit 3 of Port 2 & Address 11
bit 4 of Port 2 & Address 12
bit 5 of Port 2 & Address 13
bit 6 of Port 2 & Address 14
bit 7 of Port 2 & Address 15
Program store enable (low enable)
Address latch enable
L
H
L
o
#EA
i
External access first 4K memory
bit 7 of Port 0 & Address or Data 7
bit 6 of Port 0 & Address or Data 6
bit 5 of Port 0 & Address or Data 5
bit 4 of Port 0 & Address or Data 4
bit 3 of Port 0 & Address or Data 3
bit 2 of Port 0 & Address or Data 2
bit 1 of Port 0 & Address or Data 1
bit 0 of Port 0 & Address or Data 0
Drive Voltage, +3 Vcc (or +5 Vcc)
AD7/P0.7
AD6/P0.6
AD5/P0.5
AD4/P0.4
AD3/P0.3
AD2/P0.2
AD1/P0.1
AD0/P0.0
VDD
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
Rev. 1.0 February 1998
4
MOSEL [ MOSEL VITELIC, CORP ]
