National Instruments AT E Series - Manual (Page 93)

Chapter 4 Connecting Signals
AT E Series User Manual 4-46 ni.com
Figure 4-32 shows the timing requirements for the GPCTR0_GATE signal.
Figure 4-32. GPCTR0_GATE Signal Timing in Edge-Detection Mode
GPCTR0_OUT Signal
This signal is available only as an output on the GPCTR0_OUT pin. The
GPCTR0_OUT signal reflects the terminal count (TC) of general-purpose
counter 0. You have two software-selectable output options—pulse on TC
and toggle output polarity on TC. The output polarity is software selectable
for both options. This output is set to high-impedance at startup.
Figure 4-33 shows the timing of the GPCTR0_OUT signal.
Figure 4-33. GPCTR0_OUT Signal Timing
GPCTR0_UP_DOWN Signal
This signal can be externally input on the DIO6 pin and is not available as
an output on the I/O connector. The general-purpose counter 0 counts down
when this pin is at a logic low and counts up when it is at a logic high. You
can disable this input so that software can control the up-down
functionality and leave the DIO6 pin free for general use.
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w
GPCTR0_SOURCE
GPCTR0_OUT
GPCTR0_OUT
(Toggle Output on TC)
(Pulse on TC)
TC