Spc3 profibus interface center, 3 switching diagram principles, Low cost system with 80c32 – Siemens SPC3 User Manual
Page 41
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