Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 202)

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7647A–AVR–02/08

ATmega32/64/M1/C1

17. LIN / UART - Local Interconnect Network Controller or UART

The LIN (Local Interconnect Network) is a serial communications protocol which efficiently sup-

ports the control of mechatronics nodes in distributed automotive applications. The main

properties of the LIN bus are:

•

Single master with multiple slaves concept

• Low cost silicon implementation based on common UART/SCI interface

• Self synchronization in slave node

• Deterministic signal transmission with signal propagation time computable in advance

• Low cost single-wire implementation

• Speed up to 20 Kbit/s.

LIN provides a cost efficient bus communication where the bandwidth and versatility of CAN are

not required. The specification of the line driver/receiver needs to match the ISO9141 NRZ-

standard.

If LIN is not required, the controller alternatively can be programmed as Universal Asynchronous

serial Receiver and Transmitter (UART).

17.1 LIN Features

• Hardware Implementation of LIN 2.1 (LIN 1.3 Compatibility)

• Small, CPU Efficient and Independent Master/Slave Routines Based on “LIN Work Flow Concept”

of LIN 2.1 Specification

• Automatic LIN Header Handling and Filtering of Irrelevant LIN Frames

• Automatic LIN Response Handling

• Extended LIN Error Detection and Signaling

• Hardware Frame Time-out Detection

• “Break-in-data” Support Capability

• Automatic Re-synchronization to Ensure Proper Frame Integrity

• Fully Flexible Extended Frames Support Capabilities

17.2 UART Features

• Full Duplex Operation (Independent Serial Receive and Transmit Processes)

• Asynchronous Operation

• High Resolution Baud Rate Generator

• Hardware Support of 8 Data Bits, Odd/Even/No Parity Bit, 1 Stop Bit Frames

• Data Over-Run and Framing Error Detection

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 202