National Instruments AT-MIO-16X - Manual (Page 171)

Chapter 5 Programming
AT-MIO-16X User Manual 5-2 © National Instruments Corporation
Table 5-1 provides a general overview of the AT-MIO-16X resources
to ensure there are no conflicts when using the counters/timers. As an
example, if an interval scanning data acquisition sequence that requires
less than 65,537 samples is in operation, Counters 2, 3, and 4 of the
Am9513A are reserved for this purpose. This leaves Counters 1 and 5
available for general-purpose or waveform generation use.
Initializing the AT-MIO-16X
The AT-MIO-16X hardware must be initialized for the AT-MIO-16X
circuitry to operate properly. To initialize the AT-MIO-16X hardware,
complete the following steps:
1. Write 0 to Command Registers <1..4>.
2. Access the following strobe registers:
CONFIGMEMCLR Register
DAQ Clear Register
DMATC A and B Clear Registers
DMA Channel Clear Register
DAC Clear Register
TMRREQ Clear Register
ADC Calibration Register
3. Initialize the Am9513A (see Initializing the Am9513A section later
in this chapter).
Table 5-1. Am9513A Counter/Timer Allocations
Counter DAQ Operation Waveform Operation
1 Scan division Updating/cycle counting/pulsed
waveform
2 Scan division Updating/cycle counting/pulsed
waveform
3 Sample interval Updating
4 Sample count N/A
5 Sample count
(> 65,536) Updating/cycle counting