SyncMOS Technologies Inc.
May 2001
SM8051/80952
Pin Descriptions
40L 44L 44L
PDIP QFP PLCC
Pin# Pin# Pin#
Symbol
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
I/O Names
Active
1
2
40
41
42
43
44
1
2
3
4
5
6
7
8
9
i/o bit 0 of port 1
i/o bit 1 of port 1
i/o bit 2 of port 1
i/o bit 3 of port 1
i/o bit 4 of port 1
i/o bit 5 of port 1
i/o bit 6 of port 1
i/o bit 7 of port 1
3
4
5
6
7
2
8
3
9
4
10 RES
H
i
Reset
10
11
12
13
5
11
RXD/P3.0
i/o Receive data & bit 0 of port 3
i/o Transmit data & bit 1 of port 3
i/o low true interrupt 0 & bit 2 of port 3
i/o low true interrupt 1 & bit 3 of port 3
i/o Timer 0 & bit 4 of port 3
7
13 TXD/P3.1
14 #INT0/P3.2
15 #INT1/P3.3
16 T0/P3.4
17 T1/P3.5
18 #WR/P3.6
19 #RD/P3.7
20 XTAL2
8
L/ -
L/ -
9
14 10
15 11
16 12
17 13
18 14
19 15
20 16
21 18
22 19
23 20
24 21
25 22
26 23
27 24
28 25
29 26
30 27
31 29
32 30
33 31
34 32
35 33
36 34
37 35
38 36
39 37
40 38
i/o Timer 1 & bit 5 of port 3
L/ -
L/ -
i/o external memory write & bit 6 of port 3
i/o external memory read & bit 7 of port 3
o Crystal out
21 XTAL1
i
Crystal in
Sink Voltage, Ground
22 VSS
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
i/o bit 0 of port 2 & bit 8 of external memory address
i/o bit 1 of port 2 & bit 9 of external memory address
i/o bit 2 of port 2 & bit 10 of external memory address
i/o bit 3 of port 2 & bit 11 of external memory address
i/o bit 4 of port 2 & bit 12 of external memory address
i/o bit 5 of port 2 & bit 13 of external memory address
i/o bit 6 of port 2 & bit 14 of external memory address
i/o bit 7 of port 2 & bit 15 of external memory address
o program storage enable
L
-
L
o address latch enable
i external access
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
i/o bit 7 of port 0 & data/address bit 7 of external memory
i/o bit 6 of port 0 & data/address bit 6 of external memory
i/o bit 5 of port 0 & data/address bit 5 of external memory
i/o bit 4 of port 0 & data/address bit 4 of external memory
i/o bit 3 of port 0 & data/address bit 3 of external memory
i/o bit 2 of port 0 & data/address bit 2 of external memory
i/o bit 1 of port 0 & data/address bit 1 of external memory
i/o bit 0 of port 0 & data/address bit 0 of external memory
Drive Voltage, +5 Vcc
Specifications subject to change without notice,contact your sales representatives for the most recent information.
4/16
Ver 1.1
SM8051/8052 07/2005
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
