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Spc 3, Spc3 profibus interface center, Spc3 – Siemens SPC3 User Manual

Page 43

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SPC3

PROFIBUS Interface Center

SPC3 Hardware Description

V1.3

Page 41

Copyright (C) Siemens AG 2003 All rights reserved.

2003/04

7.1.4 Application with the 80 C 32


CLK

5

48 MHz

3k3

1

P5

XCS

3k3

23

P5

MODE

3k3

34

P5

3k3

35

P5

3

XTEST0

XTEST1

DIVIDER

4

XRD

2

XWR

24

ALE

uC

36

RESET

uC

1

0

1

2

3

4

5

6

7

8

9

1K

M

1K

M

AB

44

43

41

40

37

42

32

31

29

25

0

1

2

3

4

5

6

7

DB

11

12

15

16

19

20

21

22

RXD

30

27

RTS

TXD

26

1K

8

XINT/MOT

M

1K

33

XCTS

9

X/INT

10

AB 10

14

13

7

XREADY

XHOLDT.

CLK2

ADB(8:15)

AB8

AB9

AB10

AB11

AB12

AB13

AB14

AB15

DB(0:7)

ADB0

ADB1

ADB2

ADB3

ADB4

ADB5

ADB6

ADB7

TXD

RTS

RXD

RS485

RS485

RS485

Px.x

uC

uC

uC

uC

uC

SPC3

ALE

XWR

XRD

INT0/1

1K

M

5V or
GND


The pull up / pull down resistances in the drawing above are only relevant for a in circuit tester.The internal
chip select logic is activated when the address pins A 11 .. A 15 are set to „0“ . In the example above the
starting address of the SPC3 is set to 0x1000 .

ALE

AD 0 ..7

Processor

SPC 3

A8 .. 10

A 0..10

CS

1,5 kByte RAM
in the SPC 3

A 11.. 15 alle 0

Addreß-
latch

AD 0 ..7