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XMEGA A [MANUAL]

8077I–AVR–11/2012

Figure 6-2.

Example of event source, generator, user, and action.

Events can also be generated manually in software.

6.3.1

Signaling Events

Signaling events are the most basic type of event. A signaling event does not contain any information apart from the

indication of a change in a peripheral. Most peripherals can only generate and use signaling events. Unless otherwise

stated, all occurrences of the word ”event” are to be understood as meaning signaling events.

6.3.2

Data Events

Data events differ from signaling events in that they contain information that event users can decode to decide event

actions based on the receiver information.

Although the event routing network can route all events to all event users, those that are only meant to use signaling

events do not have decoding capabilities needed to utilize data events. How event users decode data events is shown in

Table 6-1 on page 70.

Event users that can utilize data events can also use signaling events. This is configurable, and is described in the

datasheet module for each peripheral.

6.3.3

Peripheral Clock Events

Each event channel includes a peripheral clock prescaler with a range from 1 (no prescaling) to 32768. This enables

configurable periodic event generation based on the peripheral clock. It is possible to periodically trigger events in a

peripheral or to periodically trigger synchronized events in several peripherals. Since each event channel include a

prescaler, different peripherals can receive triggers with different intervals.

6.3.4

Software Events

Events can be generated from software by writing the DATA and STROBE registers. The DATA register must be written

first, since writing the STROBE register triggers the operation. The DATA and STROBE registers contain one bit for each

event channel. Bit n corresponds to event channel n. It is possible to generate events on several channels at the same

time by writing to several bit locations at once.

Software-generated events last for one clock cycle and will overwrite events from other event generators on that event

channel during that clock cycle.

Table 6-1 on page 70 shows the different events, how they can be manually generated, and how they are decoded.

Event

Routing

Network

Compare Match

Over-/Underflow

Error

Timer/Counter

Channel Sweep

Single

Conversion

ADC

Event Generator

Event Source

Event User

Event Action

Event Action Selection

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