ATXMEGA64A1 datasheet(33/99 Pages) ATMEL

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8067I–AVR–04/09

XMEGA A1

16. AWEX - Advanced Waveform Extension

16.1

Features

• Output with complementary output from each Capture channel

• Four Dead Time Insertion (DTI) Units, one for each Capture channel

• 8-bit DTI Resolution

• Separate High and Low Side Dead-Time Setting

• Double Buffered Dead-Time

• Event Controlled Fault Protection

• Single Channel Multiple Output Operation (for BLDC motor control)

• Double Buffered Pattern Generation

16.2

Overview

The Advanced Waveform Extension (AWEX) provides extra features to the Timer/Counter in

Waveform Generation (WG) modes. The AWEX enables easy and safe implementation of for

example, advanced motor control (AC, BLDC, SR, and Stepper) and power control applications.

Any WG output from a Timer/Counter 0 is split into a complimentary pair of outputs when any

AWEX feature is enabled. These output pairs go through a Dead-Time Insertion (DTI) unit that

enables generation of the non-inverted Low Side (LS) and inverted High Side (HS) of the WG

output with dead time insertion between LS and HS switching. The DTI output will override the

normal port value according to the port override setting. Optionally the final output can be

inverted by using the invert I/O setting for the port pin.

The Pattern Generation unit can be used to generate a synchronized bit pattern on the port it is

connected to. In addition, the waveform generator output from Compare Channel A can be dis-

tributed to, and override all port pins. When the Pattern Generator unit is enabled, the DTI unit is

bypassed.

The Fault Protection unit is connected to the Event System. This enables any event to trigger a

fault condition that will disable the AWEX output. Several event channels can be used to trigger

fault on several different conditions.

The AWEX is available for TCC0 and TCE0. The notation of these peripherals are AWEXC and

AWEXE.

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