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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 42/74頁(yè) |
| 文件大小： | 546K |
| 代理商： | PCL-818L |
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38
PCL-818L User's Manual
This chapter explains how to use the PCL-818L's A/D conversion
functions. The first five sections cover A/D data format, input range
selection, status register settings, MUX scan setting, trigger modes
and data transfer. The last section gives step by step implementation
guidelines for A/D operations.
A/D Data format and status register
Since the PCL-818L uses 12-bit A/D conversions, a single 8-bit
register will not accommodate all the data. The PCL-818L therefore
stores A/D data in two registers located at addresses BASE+0 and
BASE+1.
It stores the A/D low byte data in bits D4 to D7 (AD0 to AD3) of
BASE+0 and high byte data in bits D0 to D7 (AD4 to AD11) of
BASE+1. The least significant bit is AD0 and the most significant bit
is AD11. You can read the source channel number corresponding to
the A/D data form bits D0 to D3 (C0 to C3) of BASE+0.
A/D data register format is:
BASE+0 (read only) A/D low byte and channel number
Bit
D7
D6
D5
Value
AD3
AD2
AD1
D4
AD0
D3
C3
D2
C2
D1
C1
D0
C0
BASE+1 (read only) A/D high byte
Bit
D7
D6
Value
AD11
AD10
D5
AD9
D4
AD8
D3
AD7
D2
AD6
D1
AD5
D0
AD4
The A/D status register at BASE+8 (read only) gives information on
A/D configuration and operation.
A/D status register format is:
BASE+8 A/D status
Bit
D7
Value
EOC
D6
N/A
D5
MUX
D4
INT
D3
CN3
D2
CN2
D1
CN1
D0
CN0
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