Chapter 5 Programming
AT-MIO-16X User Manual 5-30
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National Instruments Corporation
One disadvantage of the programmed cycle waveform generatio n is that
it uses yet another counter to perform the cycle counting. For this mode,
the SRC3SEL bit in Command Register 4 must be set so that the
programmed counter can count the buffer retransmit signals from the
source line of Counter 3. Counter 1, 2, or 5 can be used to count buffer
cycles in this mode. If Counter 5 is being used for the upd ate signal,
then only Counters 1 and 2 are available for cycle counting. Once the
cycle counter reaches the end of its count, DAC updating is halted
irrespective of the update signal.
Pulsed Cyclic Waveform Generation
An extension of the programmed cycle mode is the pulsed cy clic
waveform generation mode in which a programmed nu mber of cycles is
generated between a programmed cycle interval. The instructions in the
blocks of the following flow chart are enumerated in the Waveform
Generation Programming Functions section later in this chapter.