175
XMEGA A [MANUAL]
8077I–AVR–11/2012
15.
AWeX – Advanced Waveform Extension
15.1
Features
Waveform output with complementary output from each compare channel
Four dead-time insertion (DTI) units
– 8-bit resolution
– Separate high and low side dead-time setting
– Double buffered dead time
– Optionally halts timer during dead-time insertion
Pattern generation unit creating synchronised bit pattern across the port pins
– Double buffered pattern generation
– Optional distribution of one compare channel output across the port pins
Event controlled fault protection for instant and predictable fault triggering
15.2
Overview
The advanced waveform extension (AWeX) provides extra functions to the timer/counter in waveform generation (WG)
modes. It is primarily intended for use with different types of motor control and other power control applications. It
enables low- and high side output with dead-time insertion and fault protection for disabling and shutting down external
drivers. It can also generate a synchronized bit pattern across the port pins.
Figure 15-1. Advanced waveform extention and closely related peripherals (grey).
As shown in Figure 15-1 on page 175, each of the waveform generator outputs from timer/counter 0 are split into a
complimentary pair of outputs when any AWeX features are enabled. These output pairs go through a dead-time
insertion (DTI) unit that generates 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. Refer to “I/O Ports” on page 132 for more details.
Timer/Counter 0
AWeX
WG
Channel A
DTI
Channel A
WG
Channel B
DTI
Channel B
WG
Channel C
DTI
Channel C
WG
Channel D
DTI
Channel D
Port
Override
Pattern
Generation
Px0
Px1
Px2
Px3
Px4
Px5
Px6
Px7
Event
System
Fault
Protection
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