AT32UC3C2512C Automotive Atmel Corporation, AT32UC3C2512C Automotive Datasheet - Page 227
AT32UC3C2512C Automotive
Manufacturer Part Number
AT32UC3C2512C Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
2.AT32UC3C0512C_AUTOMOTIVE.pdf
(1312 pages)
3.AT32UC3C0512C_AUTOMOTIVE.pdf
(107 pages)
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14.6
14.6.1
14.6.1.1
14.6.1.2
14.6.1.3
9166C–AVR-08/11
Functional Description
PEVC Channel Operation
Channel Setup
Channel Operation
Software Event
PEVC routes incoming events to users by means of one channel per user. Channels operate in
parallel, allowing multiple users to listen to the same generator.
The Channel Multiplexer Register (CHMXn) is written to allocate a generator to a given channel.
The Event Multiplexer field (EVMX) selects between the different generators, while the Software
Event Multiplexer bit (SMX) selects Software Events.
The channel is then enabled by writing a one to the appropriate bit in the Channel Enable Regis-
ter (CHER). It is disabled by writing a one to the appropriate bit in the Channel Disable Register
(CHDR).
To safely program a channel, user software must:
When the channel is enabled, the user signals its busy/ready state to the channel, to determine
how an incoming event will be handled:
The Busy Register (BUSY) is used to determine the current activity of a channel/user. A busy
status has one of two causes:
A Software Event can be initiated by software writing to the Software Event Register (SEV). This
is intended for application debugging.
The channel must first be programmed by writing a one to the Software Event Multiplexer bit
(SMX) of CHMXn.
Writing a one to the appropriate bit of SEV will then trigger a Software Event on the channel.
• disable the channel by writing a one to CHDR
• program CHMXn
• enable the channel by writing a one to CHER
• If the user is ready, an incoming event is forwarded. The corresponding Trigger Status
• If the user is busy (because of a previous event, or for some other cause), the new event is
• A peripheral event is being relayed by the channel and handled by the user,
• No event relayed, but user is not ready (e.g. not initialized, or handling some other request).
Register (TRISR) flag is set allowing an interrupt to be generated for tracking PEVC
operations.
not forwarded. The corresponding Overrun Status Register (OVSR) flag is set allowing an
interrupt to be generated.
AT32UC3C
227
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