SyncMOS Technologies Inc.
May 2001
SM89516
Pin Descriptions
40L
44L
44L
PDIP QFP PLCC
Pin# Pin# Pin#
Symbol
T2/P1.0
Active I/O
Names
1
40
41
42
43
44
1
2
3
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
timer 2 clock out & bit 0 of port 1
timer 2 control & bit 1 of port 1
bit 2 of port 1
2
T2EX/P1.1
P1.2
3
4
4
5
P1.3
bit 3 of port 1
5
6
P1.4
bit 4 of port 1
6
7
P1.5
bit 5 of port 1
7
2
8
P1.6
bit 6 of port 1
8
3
9
P1.7
bit 7 of port 1
9
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
23
34
1
RES
H
i
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
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
i/o
i/o
i/o
i/o
i/o
i/o
o
Receive data & bit 0 of port 3
Transmit data & bit 1 of port 3
low true interrupt 0 & bit 2 of port 3
low true interrupt 1 & bit 3 of port 3
Timer 0 & bit 4 of port 3
7
8
9
L/ -
L/ -
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
17
28
39
6
Timer 1 & bit 5 of port 3
L/ -
L/ -
external memory write & bit 6 of port 3
external memory read & bit 7 of port 3
Crystal out
XTAL1
VSS
i
Crystal in
Sink Voltage, Ground
P2.0/A8
P2.1/A9
P2.2/A10
P2.3/A11
P2.4/A12
P2.5/A13
P2.6/A14
P2.7/A15
#PSEN
ALE
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
o
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
L
-
L
o
address latch enable
external access
#EA
i
P0.7/AD7
P0.6/AD6
P0.5/AD5
P0.4/AD4
P0.3/AD3
P0.2/AD2
P0.1/AD1
P0.0/AD0
VDD
i/o
i/o
i/o
i/o
i/o
i/o
i/o
i/o
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, +5 Vcc
P4.0
i/o
i/o
i/o
i/o
bit 0 of Port 4
P4.1
bit 1 of Port 4
P4.2
bit 2 of Port 4
12
P4.3
bit 3 of Port 4
Specifications subject to change without notice,contact your sales representatives for the most recent information.
4/19
Ver 1.3
PID 89516 05/01
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
