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Spc3 profibus interface center, 3 switching diagram principles, Low cost system with 80c32 – Siemens SPC3 User Manual

Page 41

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SPC3

PROFIBUS Interface Center

SPC3 Hardware Description

V1.3

Page 39

Copyright (C) Siemens AG 2003 All rights reserved.

2003/04

7.1.3 Switching Diagram Principles

AB 15...8

Pulse Generator

48MHz

80C32/
C501

Port 0

ALE

Port 2

CLK

XW R

XRD
X/INT

AB8

AB9
AB10

Low Cost System with 80C32

1K 1K

3K3

Mode

GND

VDD

RT S

T xD

RxD

XCT S

1K

GND

A / D 7...0

(0000 00XX BIN)

W R

RD

INT 0

Pulse Generator

48 MHz

80C32
20/16M Hz

Port 0

Port 2

CLK

XW R
XRD

X/INT

AB8
AB9

AB10

80C32 System with Ext. Memory (C32-Mode)

1K 1K

3K3

Mode

GND

VDD

SPC3
Reset

RT S

T xD

RxD

XCT S

1K

GND

SPC3
Reset

ALE

Address

Latch

EPROM

64kB

RAM

32kB

Address

Decoder

AB 15...0

Reset

PSEN

SPC3

Reset

SPC3

AB 7..0
Address
decoder

DB 7..0
Data

DB 7..0
Address Latch

A / D 7...0

RD W R

AB 7....0

Address-
decoder

DB 7..0
Data

DB 7..0
Address Latch

AB 15...8

(0000 00XX BIN)

W R

RD

INT 0

1K

Divider :2/4

DIVIDER

12/24 MHz

12/24 MHz

Scaler:2/4

DIVIDER

1K