XMEGAD datasheet(46/309 Pages) ATMEL

46 / 309 page

8210B–AVR–04/10

XMEGA D

Events can be manually generated by writing to the STROBE and DATA registers.

5.3.1

Signaling Events

Signaling events are the most basic type of events. A signaling event does not contain any infor-

mation 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' is to be

understood as a signaling event.

5.3.2

Data Events

Data events differ from signaling events in that they contain additional information that event

users can decode to decide event actions based on the receiver information.

The Event Routing Network can route all events to all event users. Event users that are only

meant for using signaling events have limited decode capabilities and cannot fully utilize data.

How event users decode data events is shown in Table 5-1 on page 46.

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.

5.3.3

Manually Generating Events

Events can be generated manually by writing the DATA and STROBE register. This can be done

from software, and by accessing the registers directly during on-chip debugging. The DATA reg-

ister 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 chan-

nel n. It is possible to generate events on several channels at the same time by writing to several

bit locations at once.

Manually generated events last for one clock cycle and will overwrite events from other event

during that clock cycle. When manually generating events, event channels where no events are

entered will let other events through.

Table 5-1 on page 46 shows the different events, how they can be manually generated and how

they are decoded.

5.4

Event Routing Network

The Event Routing Network routes events between peripherals. It consists of eight multiplexers

(CHnMUX), where events from all event sources are routed into all multiplexers. The multiplex-

ers select which event is routed back as input to all peripherals. The output from a multiplexer is

referred to as an Event Channel. For each peripheral it is selectable if and how incoming events

should trigger event actions. Details on these are described in the datasheet for each peripheral.

The Event Routing Network is shown on Figure 5-3 on page 47.

Table 5-1.

Manually Generated Events and decoding of events

STROBE

DATA

Data Event User

Signaling Event User

No Event

Data Event 01

No Event

Data Event 02

Signaling Event

Data Event 03

Signaling Event

XMEGAD Datasheet(PDF) 46 Page - ATMEL Corporation

XMEGAD Datasheet(HTML) 46 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL