SAM4L Datasheet, PDF (840/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
31.3 Block Diagram
The main building blocks of the PEVC are:
• Channels: One channel per user, to propagate events and follow-up the user status
• Event Shapers (EVS): Instantiated for some generators, in case synchronisation and/or edge
detection is needed prior to peripheral event propagation
• Input Glitch Filters (IGF): Present specifically for I/O inputs, to filter the incoming signal prior
to going through EVS and Channel
To help distinguish the different signalling stages, following naming conventions are used:
• Generators generate events
• PEVC multiplexes these incoming events
• PEVC outputs triggers to users
Figure 31-2. PEVC Block Diagram
PEVC
Generator
0
PAD_EVT 0
EVS 0
IGF
Generator
...
EVT...
EVS …
Generator
...
EVT...
Generator
j
EVT j
EVS
IGF
Channel 0
TRIG 0
User
RDY 0
0
CLK 0
Channel ...
TRIG...
User
RDY...
...
CLK...
Channel i
TRIG i
User
RDY i
i
CLK i
SEV
CHMX
42023C–SAM–02/2013
RCSYS
CLK_PEVC
The maximum number of generators and Event Shapers supported by the PEVC is 64.
The maximum number of channels and users supported by the PEVC is 32.
EVS and IGF implementation are device-specific.
Refer to the Module Configuration section at the end of this chapter for the device-specific
configuration.
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