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參數(shù)資料
| 型號： | PCL-818L |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | High-performance DAS card with programmable gain |
| 中文描述： | 高性能DAS的可編程增益卡 |
| 文件頁數(shù)： | 58/74頁 |
| 文件大?。?/td> | 546K |
| 代理商： | PCL-818L |
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54
PCL-818L User's Manual
MODE 2 Rate generator
The output will be low for one period of the input clock. The period
from one output pulse to the next equals the number of input counts in
the counter register. If you reload the counter register between output
pulses, the present period will not be affected, but the subsequent
period will reflect the value.
The gate input, when low, will force the output high. When the gate
input goes high, the counter will start from the initial count. You can
thus use the gate input to synchronize the counter.
With this mode the output will remain high until you load the count
register is loaded. You can also synchronize the output by software.
MODE 3 Square wave generator
This mode is similar to Mode 2, except that the output will remain high
until one half of the count has been completed (for even numbers), and
will go low for the other half of the count. This is accomplished by
decreasing the counter by two on the falling edge of each clock pulse.
When the counter reaches the terminal count, the state of the output is
changed, the counter is reloaded with the full count and the whole
process is repeated.
If the count is odd and the output is high, the first clock pulse (after
the count is loaded ) decrements the count by 1. Subsequent clock
pulses decrement the count by 2. After timeout, the output goes low
and the full count is reloaded. The first clock pulse (following the
reload) decrements the counter by 3. Subsequent clock pulses
decrement the count by two until timeout, then the whole process is
repeated. In this way, if the count is odd, the output will be high for
(N+1)/2 counts and low for (N-1)/2 counts.
MODE 4 software triggered strobe
After the mode is set, the output will be high. When the count is
loaded, the counter will begin counting. On terminal count, the output
will go low for one input clock period then go high again.
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