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Chapter 4
Connecting Signals
4-34
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GPCTR1_GATE Signal
Any PFI pin can externally input the GPCTR1_GATE signal, which is
available as an output on the PFI4/GPCTR1_GATE pin.
available as an output on the PFI4/GPCTR1_GATE pin.
As an input, GPCTR1_GATE is configured in edge-detection mode. You
can select any PFI pin as the source for GPCTR1_GATE and configure the
polarity selection for either rising or falling edge. You can use the gate
signal in a variety of different applications to perform such actions as
starting and stopping the counter, generating interrupts, saving the counter
contents, and so on.
can select any PFI pin as the source for GPCTR1_GATE and configure the
polarity selection for either rising or falling edge. You can use the gate
signal in a variety of different applications to perform such actions as
starting and stopping the counter, generating interrupts, saving the counter
contents, and so on.
As an output, GPCTR1_GATE monitors the actual gate signal connected to
general-purpose counter 1, even if the gate is being externally generated by
another PFI. This output is set to high-impedance at startup.
general-purpose counter 1, even if the gate is being externally generated by
another PFI. This output is set to high-impedance at startup.
Figure 4-31 shows the timing requirements for the GPCTR1_GATE signal.
Figure 4-31. GPCTR1_GATE Signal Timing
Rising-Edge
Polarity
Falling-Edge
Polarity
t
w
= 10 ns minimum
t
w