Datasheet

37
XMEGA A3U [DATASHEET]
Atmel-8386D-AVR-ATxmega64A3U-128A3U-192A3U-256A3U–03/2014
19. Hi-Res – High Resolution Extension
19.1 Features
 Increases waveform generator resolution up to 8x (three bits)
 Supports frequency, single-slope PWM, and dual-slope PWM generation
 Supports the AWeX when this is used for the same timer/counter
19.2 Overview
The high-resolution (hi-res) extension can be used to increase the resolution of the waveform generation output from a
timer/counter by four or eight. It can be used for a timer/counter doing frequency, single-slope PWM, or dual-slope PWM
generation. It can also be used with the AWeX if this is used for the same timer/counter.
The hi-res extension uses the peripheral 4x clock (Clk
PER4
). The system clock prescalers must be configured so the
peripheral 4x clock frequency is four times higher than the peripheral and CPU clock frequency when the hi-res extension
is enabled.
There are four hi-res extensions that each can be enabled for each timer/counters pair on PORTC, PORTD, PORTE and
PORTF. The notation of these are HIRESC, HIRESD, HIRESE and HIRESF, respectively.