Application With Th 80 C 165 - Siemens SPC3 Hardware Description

PROFIBUS Interface Center

7.1.5 Application with th 80 C 165

48 MHz
M
1K
uC
XSPC3CS
uC
M
1K
M
uC 1K
XWRL
uC
XRD
uC
P5
3k3
P5
3k3
5V or
ground
AB0
AB1
AB2
AB3
AB4
AB5
AB6
AB7
AB8
AB9
AB(0:10)
AB10
uC
The pull up / pull down resistances in the drawing above are only relevant for a in circuit tester.
Dual Port RAM Controller
The internal 1.5k RAM of the SPC3 is a Single Port RAM. Due to an integrated Dual Port RAM controller,
the controller, however, permits an almost simultaneous access of both ports (bus interface and
microsequencer interface). When there is a simultaneous access of both ports, the bus interface has
priority. This provides for the shortest possible access time. If SPC3 is connected to a microcontroller with
an asynchronous interface, SPC3 can evaluate the Ready signal.
Page 42
2003/04
5
SPC3
CLK
8
XINT/MOT CLK2
36
RESET XDATAEX.
1
XCS XREADY
23
MODE
24
ALE
XINT
2
XWR
4
XRD
34
XTEST0 XCTS
35
XTEST1
3 RXD
DIVIDER
RTS
44
0 TXD
43
1
41 0
2
40 1
3
37 2
4
42 3
5
AB DB
32 4
6
31 5
7
29 6
8
25 7
9
10
10
V1.3
SPC3
7
13
14 XREADY
9 XEXxIN
33
1K
30 RXD
27 RTS
26 TXD
11 DB0
12 DB1
15 DB2
16 DB3
19 DB4
20 DB5
21 DB6
22 DB7
SPC3 Hardware Description
Copyright (C) Siemens AG 2003. All rights reserved.
uC
uC
RS485
RS485
RS485
DB(0:7)
uC