9-17

FIGURE 13. 80C48 MICROPROCESSOR INTERFACE

28

40

39 T1

P27 38

37

36

35

P17 34

33

32

31

30

29

P10 27

26

PROG

22

24

23

P20 21

80C48

µCOMPUTER

2 XTAL1

13

3 XTAL2

4 RESET

5 SS

6 INT

7 EA

RD

DB0 12

14

15

16

17

18

19

20

1 TO

PSEN

ALE

11

9

25

DB7

10

8

27 28 29 30

CS2

36 OSC

+5V

8 DIGIT

LCD DISPLAY

SEGMENTS

HIGH ORDER DIGITS

ICM7211M

INPUT

NC

+5V

I/O

I/O

DS1 DS2 CS1

31

32

33

34

DATA

2, 3, 4

BP 5

37-40

6-26

B0-B3

29

28

27

30

CS2

36 OSC

+5V

SEGMENTS

LOW ORDER DIGITS

ICM7211M

DS1 DS2 CS1

31

32

33

34

DATA

2, 3, 4

BP 5

37-40

6-26

B0-B3

WR

ICM7211, ICM7212

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