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68
XMEGA A [MANUAL]
8077I–AVR–11/2012
Figure 6-1.
Event system overview and connected peripherals.
The event routing network consists of eight software-configurable multiplexers that control how events are routed and
used. These are called event channels, and allow for up to eight parallel event configurations and routings. The
maximum routing latency is two peripheral clock cycles. The event system works in both active mode and idle sleep
mode.
6.3
Events
In the context of the event system, an indication that a change of state within a peripheral has occurred is called an
event. There are two main types of events: signaling events and data events. Signaling events only indicate a change of
state while data events contain additional information about the event.
The peripheral from which the event originates is called the event generator. Within each peripheral (for example, a
timer/counter), there can be several event sources, such as a timer compare match or timer overflow. The peripheral
using the event is called the event user, and the action that is triggered is called the event action.
DAC
Timer /
Counters
ADC
Real Time
Counter
Port pins
CPU /
Software
DMA
Controller
IRCOM
Event Routing Network
Event
System
Controller
clkPER
Prescaler
AC
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