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Command Register 2
Command Register 2 contains only one bit that enables the auto-calibration operation of
the ADC.
Address:
Type:
Word Size: 8-bit
Bit Map:
7
6
0
0
Bit
7–3
2
Note:
1
National Instruments Corporation
Base address + 07 (hex)
Read-and-write
5
0
Name
0
SCANORDER
The UP function is not yet supported by NI-DAQ. NI-DAQ will support the
UP function in a future release.
DISABDAQ
4
3
0
0
SCANORDER
Description
Reserved bits—These bits must be set to zero for
future board compatibility.
Scan Order Bit—If this bit is cleared, the scan order is
from the channel in Command Register 1 MA<3..0>
to channel 0. The power-on value is 0. If this bit is set,
the scan order begins with channel 0 and ends with the
channel number in MA<3..0>. This bit is cleared upon
power up. To ensure proper scanning, this bit should
be correctly programmed before writing to the
SCANEN* and Channel Selection bits in Command
Register 1. This bit is only present on the
PC-LPM-16PnP.
Disable Data Acquisition Bit—This bit is used to
disable the data acquisition operation. The power-on
value is 0. Upon startup, this bit is cleared and, as a
result, the data acquisition operation is enabled.
Writing a one to this bit disables both A/D conversion
source signals OUT0* and EXTCONV*.
D-7
Appendix D
Register-Level Programming
2
1
DISABDAQ
PC-LPM-16/PnP User Manual
0
CALEN
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