August 2000
Specifications subject to change without notice,contact your sales representatives for the most recent information.
4/16
Ver 1.0
PID 2958 08/00
SyncMOS Technologies Inc.
SM2958
Pin Descriptions
40L
PDIP
Pin#
44L
QFP
Pin#
44L
PLCC
Pin#
Symbol
Active
I/O
Names
1
40
2
T2/P1.0
i/o bit 0 of port 1 & timer 2
2
41
3
T2EX/P1.1
i/o bit 1 of port 1 & timer control
3
42
4
P1.2
i/o bit 2 of port 1
4
43
5
P1.3
i/o bit 3 of port 1
5
44
6
P1.4
i/o bit 4 of port 1
6
1
7
P1.5
i/o bit 5 of port 1
7
2
8
P1.6
i/o bit 6 of port 1
8
3
9
P1.7
i/o bit 7 of port 1
9
4
10
RES
H
i Reset
10
5
11
RXD/P3.0
i/o bit 0 of port 3 & Receive data
11
7
13
TXD/P3.1
i/o bit 1 of port 3 & Transmit data
12
8
14
#INT0/P3.2
L/ -
i/o bit 2 of port 3 & low true interrupt 0
13
9
15
#INT1/P3.3
L/ -
i/o bit 3 of port 3 & low true interrupt 1
14
10
16
T0/P3.4
i/o bit 4 of port 3 & Timer 0
15
11
17
T1/P3.5
i/o bit 5 of port 3 & Timer 1
16
12
18
#WR/P3.6
L/ -
i/o bit 6 of port 3 & ext. memory write
17
13
19
#RD/P3.7
L/ -
i/o bit 7 of port 3 & ext. memory read
18
14
20
XTAL2
o Crystal out
19
15
21
XTAL1
i Crystal in
20
16
22
VSS
Sink Voltage, Ground
21
18
24
P2.0/A8
i/o bit 0 of port 2 & bit 8 of ext. memory address
22
19
25
P2.1/A9
i/o bit 1 of port 2 & bit 9 of ext. memory address
23
20
26
P2.2/A10
i/o bit 2 of port 2 & bit 10 of ext. memory address
24
21
27
P2.3/A11
i/o bit 3 of port 2 & bit 11 of ext. memory address
25
22
28
P2.4/A12
i/o bit 4 of port 2 & bit 12 of ext. memory address
26
23
29
P2.5/A13
i/o bit 5 of port 2 & bit 13 of ext. memory address
27
24
30
P2.6/A14
i/o bit 6 of port 2 & bit 14 of ext. memory address
28
25
31
P2.7/A15
i/o bit 7 of port 2& bit 15 of ext. memory address
29
26
32
#PSEN
L
o program storage enable
30
27
33
ALE
-
o address latch enable
31
29
35
#EA/VPP
L
i external access & VPP
32
30
36
P0.7/AD7
i/o bit 7 of port 0 & data/address bit 7 of ext. memory
33
31
37
P0.6/AD6
i/o bit 6 of port 0 & data/address bit 6 of ext. memory
34
32
38
P0.5/AD5
i/o bit 5 of port 0 & data/address bit 5 of ext. memory
35
33
39
P0.4/AD4
i/o bit 4 of port 0 & data/address bit 4 of ext. memory
36
34
40
P0.3/AD3
i/o bit 3 of port 0 & data/address bit 3 of ext. memory
37
35
41
P0.2/AD2
i/o bit 2 of port 0 & data/address bit 2 of ext. memory
38
36
42
P0.1/AD1
i/o bit 1 of port 0 & data/address bit 1 of ext. memory
39
37
43
P0.0/AD0
i/o bit 0 of port 0 & data/address bit 0 of ext. memory
40
38
44
VDD
Drive Voltage, +5 VCC