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12. TC0/1 – 16-bit Timer/Counter Type 0 and 1
12.1
Features
12.2
Overview
8210C–AVR–09/11
•
16-bit timer/counter
•
32-bit timer/counter support by cascading two timer/counters
•
Up to four compare or capture (CC) channels
– Four CC channels for timer/counters of type 0
– Two CC channels for timer/counters of type 1
•
Double buffered timer period setting
•
Double buffered capture or compare channels
•
Waveform generation:
– Frequency generation
– Single-slope pulse width modulation
– Dual-slope pulse width modulation
•
Input capture:
– Input capture with noise cancelling
– Frequency capture
– Pulse width capture
– 32-bit input capture
•
Timer overflow and error interrupts/events
•
One compare match or input capture interrupt/event per CC channel
•
Can be used with event system for:
– Quadrature decoding
– Count and direction control
– Capture
•
High-resolution extension
– Increases frequency and waveform resolution by 4x (2-bit) or 8x (3-bit)
•
Advanced waveform extension:
– Low- and high-side output with programmable dead-time insertion (DTI)
– Event controlled fault protection for safe disabling of drivers
Atmel AVR XMEGA devices have a set of flexible, 16-bit timer/counters (TC). Their capabilities
include accurate program execution timing, frequency and waveform generation, and input cap-
ture with time and frequency measurement of digital signals. Two timer/counters can be
cascaded to create a 32-bit timer/counter with optional 32-bit capture.
A timer/counter consists of a base counter and a set of compare or capture (CC) channels. The
base counter can be used to count clock cycles or events. It has direction control and period set-
ting that can be used for timing. The CC channels can be used together with the base counter to
do compare match control, frequency generation, and pulse width waveform modulation, as well
as various input capture operations. A timer/counter can be configured for either capture or com-
pare functions, but cannot perform both at the same time.
A timer/counter can be clocked and timed from the peripheral clock with optional prescaling or
from the event system. The event system can also be used for direction control and capture trig-
ger or to synchronize operations.
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
Atmel AVR XMEGA D
134
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