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| 型号： | C16X |
| 厂商： | SIEMENS AG |
| 元件分类： | 8位微控制器 |
| 英文描述： | 8-Bit Microcontroller(8位微控制器) |
| 中文描述： | 8位微控制器（8位微控制器） |
| 文件页数： | 4/40页 |
| 文件大小： | 460K |
| 代理商： | C16X |
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Using the
SSC (SPI) Interface in a Multimaster System
Semiconductor Group
4 of 40
AP1632 06.96
Following the SSC and the board are configured to slave indicated by a running LED light.
Pushing the button on the display board now forces the controller to create a message to
be sent via the SSC requiring master status for the board when the current master is
providing SSC Shift Clock. If there is no master in the system (e.g. after start-up of all
boards) the controller waits for a certain time and automatically becomes master when no
clock is applied. The LED display now shows in the center part the (binary) number to be
added to the board ID resulting in the board ID of the remote controlled board. Remote
controlled boards remaining in slave mode are accessed in ascending order by additional
single clicks providing a wrap-around. Double-clicking the masters button will now result
in toggling the direction of the running LEDs on the remote controlled board. Additionally,
there is a 16 word data transfer performed between specified memory areas of master and
slave which can only be detected using monitor software to view the memory or recording
the SSC data flow using a digitizing scope in single-shot mode. A brief graphical overview
of the activities is shown in the chart in fig.2
Figure 2:
Flow of software from the user’s view
sw itch to SLAVE, show running LED, toggle direction upon received com m and
from current m aster and receive 16 w ords of data
W AIT FO R PRESSED KEY
KEY
SINGLE CLICK
DO UBLE CLICK
sw itch to M ASTER, w itch forw ard one board,
show fixed LED pattern and num ber of current
slave board
SLAVE: toggle direction of LED on board
M ASTER toggle direction of LED of current
slave board, transfer 16 w ords
# of boards exceeded
NO
YES
REPEAT
REPEAT
%
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