Datasheet

36
[Not recommended for new designs - Use XMEGA A1U series] XMEGA A1 [DATASHEET]
8067O–AVR–06/2013
16. T/C - 16-bit Timer/Counter
16.1 Features
 Eight 16-bit Timer/Counters
 Four Timer/Counters of type 0
 Four Timer/Counters of type 1
 Four Compare or Capture (CC) Channels in Timer/Counter 0
 Two Compare or Capture (CC) Channels in Timer/Counter 1
 Double Buffered Timer Period Setting
 Double Buffered Compare or Capture Channels
 Waveform Generation:
 Single Slope Pulse Width Modulation
 Dual Slope Pulse Width Modulation
 Frequency Generation
 Input Capture:
 Input Capture with Noise Cancelling
 Frequency capture
 Pulse width capture
 32-bit input capture
 Event Counter with Direction Control
 Timer Overflow and Timer Error Interrupts and Events
 One Compare Match or Capture Interrupt and Event per CC Channel
 Supports DMA Operation
 Hi-Resolution Extension (Hi-Res)
 Advanced Waveform Extension (AWEX)
16.2 Overview
Atmel AVR XMEGA devices have a set of eight flexible 16-bit timer/counters (TC). Their capabilities include accurate
program execution timing, frequency and waveform generation, and input capture with time and frequency measurement
of digital signals. Two timer/counters can be cascaded to create a 32-bit timer/counter with optional 32-bit capture.
A timer/counter consists of a base counter and a set of compare or capture (CC) channels. The base counter can be
used to count clock cycles or events. It has direction control and period setting that can be used for timing. The CC
channels can be used together with the base counter to do compare match control, frequency generation, and pulse
width waveform modulation, as well as various input capture operations. A timer/counter can be configured for either
capture or compare functions, but cannot perform both at the same time.
A timer/counter can be clocked and timed from the peripheral clock with optional prescaling or from the event system.
The event system can also be used for direction control and capture trigger or to synchronize operations.
There are two differences between timer/counter type 0 and type 1. Timer/counter 0 has four CC channels, and
timer/counter 1 has two CC channels. All information related to CC channels 3 and 4 is valid only for timer/counter 0.
Only Timer/Counter 0 has the split mode feature that split it into 2 8-bit Timer/Counters with four compare channels each.
Some timer/counters have extensions to enable more specialized waveform and frequency generation. The advanced
waveform extension (AWeX) is intended for motor control and other power control applications. It enables low- and high-
side output with dead-time insertion, as well as fault protection for disabling and shutting down external drivers. It can
also generate a synchronized bit pattern across the port pins.
The advanced waveform extension can be enabled to provide extra and more advanced features for the Timer/Counter.
This is only available for Timer/Counter 0. See “AWeX - Advanced Waveform Extension” on page 38 for more details.