Datasheet

35
XMEGA A4U [DATASHEET]
Atmel-8387H-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_09/2014
16. TC0/1 – 16-bit Timer/Counter Type 0 and 1
16.1 Features
z Five 16-bit timer/counters
z Three timer/counters of type 0
z Two timer/counters of type 1
z Split-mode enabling two 8-bit timer/counter from each timer/counter type 0
z 32-bit timer/counter support by cascading two timer/counters
z Up to four compare or capture (CC) channels
z Four CC channels for timer/counters of type 0
z Two CC channels for timer/counters of type 1
z Double buffered timer period setting
z Double buffered capture or compare channels
z Waveform generation:
z Frequency generation
z Single-slope pulse width modulation
z Dual-slope pulse width modulation
z Input capture:
z Input capture with noise cancelling
z Frequency capture
z Pulse width capture
z 32-bit input capture
z Timer overflow and error interrupts/events
z One compare match or input capture interrupt/event per CC channel
z Can be used with event system for:
z Quadrature decoding
z Count and direction control
z Capture
z Can be used with DMA and to trigger DMA transactions
z High-resolution extension
z Increases frequency and waveform resolution by 4x (2-bit) or 8x (3-bit)
z Advanced waveform extension:
z Low- and high-side output with programmable dead-time insertion (DTI)
z Event controlled fault protection for safe disabling of drivers
16.2 Overview
Atmel AVR XMEGA devices have a set of five 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.