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# 1.34 TC Compare Mode

This example shows how to use the TC module in compare mode to generate an active low, active high, and toggle output on compare match.

## Description

Three TC channels are configured in compare mode. Each channel generates different output waveform depending upon configured action on compare match and period match.

Active low output: Output is set high on compare 1 match and is set low on compare 0 match.

Active high output: Output is set low on compare 1 match and is set high on compare 0 match.

Toggle output: Output toggles on compare 0 match.

## Downloading and Building the Application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/tc/tc_compare_mode/firmware.

To build the application, refer to the following table and open the project using its IDE.

Project Name | Description
--- | ---
sam_d21_xpro.X | MPLABX project for SAM D21 Xplained Pro Evaluation Kit
sam_da1_xpro.X | MPLABX project for SAM DA1 Xplained Pro Evaluation Kit

## Setting Up the Hardware

The following table shows the target hardware for the application projects.

Project Name | Description
--- | ---
sam_d21_xpro.X | SAM D21 Xplained Pro Evaluation Kit
sam_da1_xpro.X | SAM DA1 Xplained Pro Evaluation Kit

### Setting Up SAM D21 Xplained Pro Evaluation Kit

- Connect the Debug USB port on the board to the computer using a micro USB cable

### Setting Up SAM DA1 Xplained Pro Evaluation Kit

- Connect the Debug USB port on the board to the computer using a micro USB cable

## Running the Application

1. Build and Program the application using its IDE
2. Observe generated waveforms on the oscilloscope

SAM D21 Xplained Pro Evaluation Kit:

Timer Channel | Pin | Observable Characteristic of the Waveform
--- | --- | ---
TC3_WO1 | PA19 (Pin 18 of EXT2) | Active low output with 75 Hz frequency
TC4_WO1 | PB09 (Pin 13 of EXT1) | Active high output with 75 Hz frequency
TC6_WO1 | PB03 (Pin 8 of EXT1) | Toggle output with 37.5 Hz frequency

SAM DA1 Xplained Pro Evaluation Kit:

Timer Channel | Pin | Observable Characteristic of the Waveform
--- | --- | ---
TC3_WO1 | PA19 (Pin 18 of EXT2) | Active low output with 75 Hz frequency
TC4_WO1 | PB09 (Pin 13 of EXT1) | Active high output with 75 Hz frequency
TC6_WO1 | PB03 (Pin 8 of EXT1) | Toggle output with 37.5 Hz frequency