SM8951B Datasheet, PDF (6/18 Pages) SyncMOS Technologies,Inc – 8-Bits Micro-controller

SyncMOS Technologies International, Inc.
SM8951B
8-Bits Micro-controller
With4KBFlashROM&128bytesRAM embedded
Pin Description
40L 44L 44L Symbol
Active I/O Names
PDIP PQFP PLCC
Pin Pin Pin
1
40
2
P1.0
i/o bit 0 of port 1
2
41
3
P1.1
i/o bit 1 of port 1
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
P3.0/RXD
i/o bit 0 of port 3 & Receive data
11
6
13
P3.1/TXD
i/o bit 1 of port 3 & Transmit data
12
7
14
P3.2/#INT0 L/ - i/o bit 2 of port 3 & low true interrupt 0
13
8
15
P3.3/#INT1 L/ - i/o bit 3 of port 3 & low true interrupt 1
14
9
16
P3.4/T0
i/o bit 4 of port 3Timer 0
15
10
17
P3.5/T1
i/o bit 5 of port 3 & Timer 1
16
11
18
P3.6/#WR L/ - i/o bit 6 of port 3 & external memory write
17
12
19
P3.7/#RD L/ - i/o bit 7 of port 3 & external memory read
18
13
20
XTAL2
o Crystal out
19
14
21
XTAL1
i
Crystal in
20
15
22
VSS
Sink Voltage, Ground
21
16
24
P2.0/A8
i/o bit 0 of port 2 & bit 8 of external memory address
22
19
25
P2.1/A9
i/o bit 1 of port 2 & bit 9 of external memory address
23
20
26
P2.2/A10
i/o bit 2 of port 2 & bit 10 of external memory address
24
21
27
P2.3/A11
i/o bit 3 of port 2 & bit 11 of external memory address
25
22
28
P2.4/A12
i/o bit 4 of port 2 & bit 12 of external memory address
26
23
29
P2.5/A13
i/o bit 5 of port 2 & bit 13 of external memory address
27
24
30
P2.6/A14
i/o bit 6 of port 2 & bit 14 of external memory address
28
25
31
P2.7/A15
i/o bit 7 of port 2 & bit 15 of external memory address
29
26
32
#PSEN
L
o Program Storage Enable
30
27
33
ALE
-
o Address Latch Enable
31
29
35
#EA
L
i
External Access(If you are not using external memory,
please keep this pin to VCC)
32
30
36
P0.7/AD7
i/o bit 7 of port 0 & data/address bit 7 of external memory
33
31
37
P0.6/AD6
i/o bit 6 of port 0 & data/address bit 6 of external memory
34
32
38
P0.5/AD5
i/o bit 5 of port 0 & data/address bit 5 of external memory
35
33
39
P0.4/AD4
i/o bit 4 of port 0 & data/address bit 4 of external memory
36
34
40
P0.3/AD3
i/o bit 3 of port 0 & data/address bit 3 of external memory
37
35
41
P0.2/AD2
i/o bit 2 of port 0 & data/address bit 2 of external memory
38
36
42
P0.1/AD1
i/o bit 1 of port 0 & data/address bit 1 of external memory
39
37
43
P0.0/AD0
i/o bit 0 of port 0 & data/address bit 0 of external memory
40
38
44
VDD
Drive Voltage, Vcc
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M022Ver:BSM8951B
6
06/2009