Mostek 21-10-04

SCHEMATIC

Page-1/2

VCC

(9-12V)

1

IN

2

GND

3

OUT

U1

7805

1

2

R1

1

2

C1

+

-

1

2

D1

LED

LED

BLUE

1

2

C2

+

-

0.01MFD

103

1K

1

2

BT1

BATTERY

GND

GND

POWER ON

1000 MFD 12V

GND

GND

GND

VCC

89s8252

VCC

20 PIN OCTAL BUFFER

Microcontroller

PORT-0 RED

31

EA/VP

19

X1

18

X2

9

RESET

12

INT0_P3.2

13

INT1_P3.3

14

T0_P3.4

15

T1_P3.5

1

P1.0

2

P1.1

3

P1.2

4

P1.3

5

P1.4

6

P1.5

7

P1.6

8

P1.7

39

P0.0

38

P0.1

37

P0.2

36

P0.3

35

P0.4

34

P0.5

33

P0.6

32

P0.7

21

P2.0

22

P2.1

23

P2.2

24

P2.3

25

P2.4

26

P2.5

27

P2.6

28

P2.7

17

(P3.7)_RD

16

(P3..6)_WR

29

PSEN

30

ALE/P

11

(P3.1)_TXD

10

(P3.0)_RXD

40

VCC

20

GND

U2

8051

2

1A1

4

1A2

6

1A3

8

1A4

11

2A1

13

2A2

15

2A3

17

2A4

1

1G

19

2G

18

1Y1

16

1Y2

14

1Y3

12

1Y4

9

2Y1

7

2Y2

5

2Y3

3

2Y4

20

VCC

10

GND

U3

74ls244

74ls244

SEG-A

PORT 1 YELLOW

SEG-B

P10

SEG-C

P11

SEG-D

P12

SEG-E

P13

SEG-F

P14

SEG-G

SEG-DP

MOSI

MISO

PORT-2 GREEN

SCK

GND

6 MHZ

1

2

Y1

CRYSTAL

VCC

1

2

C3

+

-

1

2

C4

+

-

U4

ULN2803

10

+V

9

GND

1

IN

2

IN

3

IN

4

IN

5

IN

6

IN

7

IN

16

OUT

15

OUT

14

OUT

13

OUT

12

OUT

11

OUT

17

OUT

8

IN

18

OUT

DIGIT-1

DIGIT-2

GND

DIGIT-3

22PF

GND

DIGIT-4

DIGIT-5

DIGIT-6

VCC

1

2

C5

+

-

RESET

GND

10 MFD

10K

1

2

R2

GND

1

2

S1

SW_PUSH

1

2

R3

1K

1

2
3
4
5
6
7
8
9

RN?

r8-pack

10K

VCC

1

2

3

4

5

6

7

8

9

RN?

r8-pack

10K

VCC

89S8252 Mostek - EFY CLOCK

1

2

R1

1

2

R1

1

2

R1

1

2

R1

1

2

R1

1

2

R1

1

2

R1

1

2

R1

330 OHMS

LED