Datasheet

each bit period and reloaded each time a new character is received. If the counter reaches 0, US_CSR.TIMEOUT
rises.
If US_CR.STTT
O is written to ‘1’, the counter clock is stopped until a first character is received.
If US_CR.RETTO is written to ‘1’, the counter starts counting down immediately from the value TO.
Table 46-14. Receiver Timeout Programming
LIN Specification Baud Rate Timeout period US_RTOR.TO
2.0 1,000 bit/s 4 s 4,000
2,400 bit/s 9,600
9,600 bit/s 38,400
19,200 bit/s 76,800
20,000 bit/s 80,000
1.3 – 25,000 t
bit
25,000
46.6.10 LON Mode
The LON mode provides connectivity to the local operating network (LON).
The LON standard covers all seven layers of the OSI (Open Systems Interconnect) reference model from the
physical interfaces such as wired, power line, RF
, and IP to the application layer and all layers in between. It was
designed from the bottom up as a controls communication platform.
The LON mode enables the transmission and reception of Physical Protocol Data Unit (PPDU) frames with minimum
intervention from the microprocessor.
Figure 46-54. LON Protocol Layering
Application & Presentation Layers
Session Layer
Request-response
Transport Layer
Acknowledged and unacknowledged unicast and multicast
Authentification
Server
Transaction Control Sublayer
Common ordering and duplicate detection
Network Layer
Connection-less, domain-wide broadcast, no segmentation,
loop-free topology
, learning routers
Link Layer
Framing, data encoding, CRC checking
MAC Sublayer
Predictive p-persistent CSMA: collision avoidance
optional priority and collision detection
Physical Layer
Multiple-media, medium-specific protocols
Application:
network variable exchange
application-specific TPC, etc.
Network Management:
network management RPC,
diagnostics
Layers 6, 7
Layer 5
Layer 4
Layer 3
Layer 2
Layer 1
Application
Software
USART
in
LON Mode
Transceiver
The USART configured in LON mode is a full-layer 2 implementation including standard timings handling, framing
(transmit and receive PPDU frames), backlog estimation and other features. At the frame encoding/decoding level,
dif
ferential Manchester encoding is used (also known as CDP). When configured in LON mode, there is no
embedded digital line filter, thus the optimal usage is node-to-node communication.
SAM E70/S70/V70/V71 Family
Universal Synchronous Asynchronous Receiver T
ransc...
© 2019 Microchip T
echnology Inc.
Datasheet
DS60001527D-page 1219