SM8954B datasheet(8/49 Pages) SYNCMOS

Part #	SM8954B

Description	On-chip 768 bytes expanded RAM

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Manufacturer	SYNCMOS [SyncMOS Technologies,Inc]

Direct Link	http://www.syncmos.com.tw

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SM8954B

8-Bit Micro-controller

16KB Flash

& 1KB RAM embedded

Specifications subject to change without notice contact your sales representatives for the most recent information.

ISSFD-M083

Ver D SM8954B 08/07/2015

- 8 -

Pin Description

40L

PDIP

44L

PLCC

44L

PQFP

Symbol

I/O

Description

1

39

P4.2

I/O

Bit 2 of port 4

1

2

40

P1.0/T2

I/O

Bit 0 of port 1 & Timer 2 external input clock

2

3

41

P1.1/T2EX

I/O

Bit 1 of port 1 & Timer 2 capture trigger

3

4

42

P1.2/PWM0

I/O

Bit 2 of port 1 & PWM Channel 0

4

5

43

P1.3/PWM1

I/O

Bit 3 of port 1 & PWM Channel 1

5

6

44

P1.4

I/O

Bit 4 of port 1

6

7

1

P1.5

I/O

Bit 5 of port 1

7

8

2

P1.6/SCL

I/O

Bit 6 of port 1 & IIC SCL pin

8

9

3

P1.7/SDA

I/O

Bit 7 of port 1 & IIC SDA pin

9

10

4

RESET

I

Reset pin

10

11

5

P3.0/RXD

I/O

Bit 0 of port 3 & Serial interface channel receive data

12

6

P4.3

I/O

Bit 3 of port 4

11

13

7

P3.1/TXD

I/O

Bit 1 of port 3 & Serial interface channel Transmit data

12

14

8

P3.2/INT0

I/O

Bit 2 of port 3 & Interrupt 0

13

15

9

P3.3/INT1

I/O

Bit 3 of port 3 & Interrupt 1

14

16

10

P3.4/T0

I/O

Bit 4 of port 3 & Timer 0 external input

15

17

11

P3.5/T1

I/O

Bit 5 of port 3 & Timer 1 external input

16

18

12

P3.6/WR

I/O

Bit 6 of port 3 & external memory write

17

19

13

P3.7/RD

I/O

Bit 7 of port 3 & external memory read

18

20

14

XTAL2

I/O

Crystal output

19

21

15

XTAL1

I/O

Crystal input

20

22

16

VSS

I

Ground

23

17

P4.0

I/O

Bit 0 of port 4

21

24

18

P2.0/A8

I/O

Bit 0 of port 2 & bit 8 of external memory address

22

25

19

P2.1/A9

I/O

Bit 1 of port 2 & bit 9 of external memory address

23

26

20

P2.2/A10

I/O

Bit 2 of port 2 & bit 10 of external memory address

24

27

21

P2.3/A11

I/O

Bit 3 of port 2 & bit 11 of external memory address

25

28

22

P2.4/A12

I/O

Bit 4 of port 2 & bit 12 of external memory address

26

29

23

P2.5/A13

I/O

Bit 5 of port 2 & bit 13 of external memory address

27

30

24

P2.6/A14

I/O

Bit 6 of port 2 & bit 14 of external memory address

28

31

25

P2.7/A15

I/O

Bit 7 of port 2 & bit 15 of external memory address

29

32

26

PSEN

O

program storage enable

30

33

27

ALE

O

address latch enable

34

28

P4.1

I/O

Bit 1 of port 4

31

35

29

EA

I

external access

32

36

30

P0.7/AD7

I/O

Bit 7 of port 0 & data/address bit 7 of external memory

33

37

31

P0.6/AD6

I/O

Bit 6 of port 0 & data/address bit 6 of external memory

34

38

32

P0.5/AD5

I/O

Bit 5 of port 0 & data/address bit 5 of external memory

35

39

33

P0.4/AD4

I/O

Bit 4 of port 0 & data/address bit 4 of external memory

36

40

34

P0.3/AD3

I/O

Bit 3 of port 0 & data/address bit 3 of external memory

37

41

35

P0.2/AD2

I/O

Bit 2 of port 0 & data/address bit 2 of external memory

38

42

36

P0.1/AD1

I/O

Bit 1 of port 0 & data/address bit 1 of external memory

39

43

37

P0.0/AD0

I/O

Bit 0 of port 0 & data/address bit 0 of external memory

40

44

38

VDD

I

Power supply

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