National Instruments PCI-1200 Bedienungsanleitung PDF herunterladen (Seite 55)

Chapter 4 Theory of Operation

The PCI-1200 generates an interrupt in the following five cases (each of

these interrupts is individually enabled and cleared):

• When a single A/D conversion can be read from the A/D FIFO

memory.

• When the A/D FIFO is half-full.

• When a DAQ operation completes, including when either an

OVERFLOW or an OVERRUN error occurs.

• When the digital I/O circuitry generates an interrupt.

• When a rising edge signal is detected on the DAC update signal.

Timing

The PCI-1200 uses two 82C53 counter/timer integrated circuits for internal

DAQ and DAC timing and for general purpose I/O timing functions.

Figure 4-3 shows a block diagram of both groups of timing circuitry

(counter groups A and B).

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National Instruments PCI-1200 Bedienungsanleitung Seite 55