User manual

Chapter 4 Connecting Signals

GPCTR1_OUT Signal

This signal is available only as an output on the GPCTR1_OUT pin.

The GPCTR1_OUT signal monitors the TC device general-purpose

counter 1. 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 tri-state at startup.

Figure 4-34 shows the timing requirements for the GPCTR1_OUT signal.

Figure 4-34. GPCTR1_OUT Signal Timing

GPCTR1_UP_DOWN Signal

This signal can be externally input on the DIO7 pin and is not available

as an output on the I/O connector. General-purpose counter 1 counts down

when this pin is at a logic low and counts up at a logic high. This input

can be disabled so that software can control the up-down functionality

and leave the DIO7 pin free for general use. Figure 4-35 shows the timing

requirements for the GATE and SOURCE input signals and the timing

specifications for the OUT output signals of your device.

Rising-Edge

Polarity

Falling-Edge

Polarity

= 10 ns minimum

UM.book Page 39 Monday, May 14, 2001 10:32 AM