Datasheet

36
XMEGA A4U [DATASHEET]
Atmel-8387H-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_09/2014
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 two 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 are only available for Timer/Counter 0. See “AWeX – Advanced Waveform Extension” on page
38 for more details.
The high-resolution (hi-res) extension can be used to increase the waveform output resolution by four or eight times
by using an internal clock source running up to four times faster than the peripheral clock. See “Hi-Res – High
Resolution Extension” on page 39 for more details.
Figure 16-1. Overview of a Timer/Counter and closely related peripherals.
PORTC and PORTD each has one Timer/Counter 0 and one Timer/Counter1. PORTE has one Timer/Conter0.
Notation of these are TCC0 (Time/Counter C0), TCC1, TCD0, TCD1 and TCE0, respectively.
AWeX
Compare/Capture Channel D
Compare/Capture Channel C
Compare/Capture Channel B
Compare/Capture Channel A
Waveform
Generation
Buffer
Comparator
Hi-Res
Fault
Protection
Capture
Control
Base Counter
Counter
Control Logic
Timer Period
Prescaler
Dead-Time
Insertion
Pattern
Generation
clk
PER4
PORT
Event
System
clk
PER
Timer/Counter