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Appendix D Register-Level Programming
National Instruments Corporation D-13 PC-LPM-16/PnP User Manual
Status Register 2
Status Register 2 contains supplementary error information. This register is only on the
PC-LPM-16PnP.
Address:
01(hex)
Type:
Read-only
Word Size:
8-bit
Bit Map:
Bit Name Description
7–2 X Don’t care bits.
1 OVERFLOW Overflow Bit—This bit indicates if an overflow error
has occurred. If this bit is cleared, no error was
encountered. If this bit is set, the A/D FIFO has
overflowed because the data acquisition servicing
operation could not keep up with the sampling rate. To
clear this bit, write to the A/D Clear Register.
0 OVERRUN Overrun Bit—This bit indicates whether an A/D
conversion was initiated before the previous A/D
conversion was complete. OVERRUN is an error
condition that will occur if the data acquisition sample
interval is too small (sample rate is too high). If
OVERRUN is set, one or more conversions was
skipped. If OVERRUN is cleared, no overrun
condition has occurred. To clear this bit, write to the
A/D Clear Register.
7
6 5 4 3 2 1 0
X X X X X X OVERFLOW OVERRUN
a.Book : l.Appendix D Page 13 Wednesday, November 20, 1996 6:36 PM