The SAM D21 Timer/Counter (TC) module provides a set of timing and counting related functionality, such as the generation of periodic waveforms, the capturing of a periodic waveform's frequency/duty cycle, and software timekeeping for periodic operations. TC modules can be configured to use an 8-, 16-, or 32-bit counter size.

Timer/Counter Features

• Selectable configuration
  • Up to five 16-bit TCs, each configurable as:
  • 8-bit TC with two compare/capture channels
  • 16-bit TC with two compare/capture channels
  • 32-bit TC with two compare/capture channels, by using two TCs
• Waveform generation
  • Frequency generation
  • Single-slope pulse-width modulation
• Input capture
  • Event capture
  • Frequency capture
  • Pulse-width capture
• One input event
• Interrupts/output events on:
  • Counter overflow/underflow
  • Compare match or capture
• Internal prescaler
• Can be used with DMA and to trigger DMA transactions

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