Chapter 4
Connecting Signals
4-36
ni.com
Figure 4-31.
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 count 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.
GPCTR1_SOURCE Signal
Any PFI pin can externally input the GPCTR1_SOURCE signal, which
is available as an output on the PFI3/GPCTR1_SOURCE pin.
As an input, GPCTR1_SOURCE is configured in the edge-detection mode.
You can select any PFI pin as the source for GPCTR1_SOURCE and
configure the polarity selection for either rising or falling edge.
As an output, GPCTR1_SOURCE monitors the actual clock connected to
general-purpose counter 1, even if the source clock is being externally
generated by another PFI. This output is set to high-impedance at startup.
GPCTR0_SOURCE
GPCTR0_OUT
GPCTR0_OUT
(Toggle Output on TC)
(Pulse on TC)
TC
