ATXMEGA256A3B datasheet(32/105 Pages) ATMEL

32 / 105 page

8116H–AVR–08/10

XMEGA A3B

16. T/C - 16-bit Timer/Counter with PWM

16.1

Features

• Seven 16-bit Timer/Counters

– Four Timer/Counters of type 0

– Three 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

XMEGA A3B has seven Timer/Counters, four Timer/Counter 0 and three Timer/Counter 1. The

difference between them is that Timer/Counter 0 has four Compare/Capture channels, while

Timer/Counter 1 has two Compare/Capture channels.

The Timer/Counters (T/C) are 16-bit and can count any clock, event or external input in the

microcontroller. A programmable prescaler is available to get a useful T/C resolution. Updates of

Timer and Compare registers are double buffered to ensure glitch free operation. Single slope

PWM, dual slope PWM and frequency generation waveforms can be generated using the Com-

pare Channels.

Through the Event System, any input pin or event in the microcontroller can be used to trigger

input capture, hence no dedicated pins are required for this. The input capture has a noise can-

celler to avoid incorrect capture of the T/C, and can be used to do frequency and pulse width

measurements.

A wide range of interrupt or event sources are available, including T/C Overflow, Compare

match and Capture for each Compare/Capture channel in the T/C.

PORTC, PORTD and PORTE each has one Timer/Counter 0 and one Timer/Counter1. PORTF

has one Timer/Counter 0. Notation of these are TCC0 (Time/Counter C0), TCC1, TCD0, TCD1,

TCE0, TCE1 and TCF0, respectively.

ATXMEGA256A3B Datasheet(PDF) 32 Page - ATMEL Corporation

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