ATtiny167-ESSZ datasheet(164/282 Pages) ATMEL

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164

7728D–AVR–07/09

ATtiny87/ATtiny167

15.3.3

Data Transport

Two types of data may be transported in a frame; signals or diagnostic messages.

• Signals

Signals are scalar values or byte arrays that are packed into the data field of a frame. A

signal is always present at the same position in the data field for all frames with the same

identifier.

• Diagnostic messages

Diagnostic messages are transported in frames with two reserved identifiers. The

interpretation of the data field depends on the data field itself as well as the state of the

communicating nodes.

15.3.4

Schedule Table

The master task (in the master node) transmits frame headers based on a schedule table. The

schedule table specifies the identifiers for each header and the interval between the start of a

frame and the start of the following frame. The master application may use different schedule

tables and select among them.

15.3.5

Compatibility with LIN 1.3

LIN 2.1 is a super-set of LIN 1.3.

A LIN 2.1 master node can handle clusters consisting of both LIN 1.3 slaves and/or LIN 2.1

slaves. The master will then avoid requesting the new LIN 2.1 features from a LIN 1.3 slave:

• Enhanced checksum,

• Re-configuration and diagnostics,

• Automatic baud rate detection,

• "Response error" status monitoring.

LIN 2.1 slave nodes can not operate with a LIN 1.3 master node (e.g. the LIN1.3 master does

not support the enhanced checksum).

The LIN 2.1 physical layer is backwards compatible with the LIN1.3 physical layer. But not the

other way around. The LIN 2.1 physical layer sets greater requirements, i.e. a master node

using the LIN 2.1 physical layer can operate in a LIN 1.3 cluster.

15.4

LIN / UART Controller

The LIN/UART controller is divided in three main functions:

• Tx LIN Header function,

• Rx LIN Header function,

• LIN Response function.

These functions mainly use two services:

•Rx service,

•Tx service.

Because these two services are basically UART services, the controller is also able to switch

into an UART function.

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