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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)： | 38/74頁 |
| 文件大小： | 546K |
| 代理商： | PCL-818L |
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34
PCL-818L User's Manual
Remarks
If you trigger the A/D conversion with the on-board pacer or an
external pulse, your software should check the INT bit, not the EOC
bit, before it reads the conversion data.
EOC can equal 0 in two different situations: the conversion is com-
pleted
or
no conversion has been started. Your software should
therefore wait for the signal INT = 1 before it reads the conversion
data. It should then clear the INT bit by writing any value to the A/D
status register BASE+8.
Control register BASE+9
Read/write register BASE+9 provides information on the PCL-818L's
operating modes.
BASE+9 Control
Bit
D7
Value
INTE
D6
I2
D5
I1
D4
I0
D3
X
D2
DMAE
D1
ST1
D0
ST0
INTE
Disable/enable PCL-818L generated interrupts
0
Disables interrupt generation. No interrupt signal
can be sent to the PC bus.
1
Enables interrupt generation. If DMAE
= 0 the PCL-
818L will generate an interrupt when it completes an
A/D conversion. Use this setting for interrupt driven
data transfer.
If DMAE = 1 the PCL-818L will generate an
interrupt when it receives a T/C (terminal count)
signal from the PC's DMA controller, indicating that
a DMA transfer has completed. Use this setting for
DMA data transfer. The DMA transfer is stopped by
the interrupt caused by the T/C signal. See DMAE
below.
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