National Instruments AT-MIO-16X - Manual (Page 172)

Chapter 5 Programming
© National Instruments Corporation 5-3 AT-MIO-16X User Manual
4. Disable all RTSI switch connections (see Programming the RTSI
Switch section later in this chapter).
This sequence leaves the AT-MIO-16X circuitry in the following state:
• DMA and interrupts are disabled.
• The DMA circuitry is cleared.
• The outputs of counter/timers are in the high-impedance state.
• The analog input circuitry is initialized.
• The analog output is in immediate update mode.
• The ADC and DAC FIFOs are cleared.
• The DIO ports A and B are set for input mode.
Initializing the Am9513A
Use the following sequence to initialize the Am9513A Counter/Timer.
All writes are 16-bit operations. All values are given in hexadecimal.
After this sequence of writes, the Am9513A Counter/Timer is in the
following state:
• 16-bit mode is enabled.
• The BCD scaler division is selected.
• The FOUT signal is turned off.
• All counter OUT output pins are set to the high-impedance output
state.
• All counters are loaded with a nonterminal count value.
For additional details concerning the Am9513A Counter/Timer, see
Appendix C, AMD Am9513A Data Sheet.