Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  12   SERIAL  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

536  

Jul 04, 2013 

LIN stands for Local Interconnect Network and is a low-speed (1 to 20 kbps) serial communication protocol designed to 

reduce the cost of an automobile network. 

Communication of LIN is single-master communication and up to 15 slaves can be connected to one master. 

The slaves are used to control switches, actuators, and sensors, which are connected to the master via LIN. 

Usually, the master is connected to a network such as CAN (Controller Area Network). 

A LIN bus is a single-wire bus to which nodes are connected via transceiver conforming to ISO9141. 

According to the protocol of LIN, the master transmits a frame by attaching baud rate information to it.  A slave receives 

this frame and corrects a baud rate error from the master.  If the baud rate error of a slave is within 

±15%, communication 

can be established. 

Figure 12-97 outlines a master transmission operation of LIN. 

 

 

LIN Bus

Wakeup signal

frame

8 bits

55H

transmission

Data

transmission

Data

transmission

Data

transmission

Data

transmission

13-bit BF

transmission

Break field

Sync field

Identification

field

Data field

Data field

Checksum

field

T

X

D2

(output)

INTST2

 

 

Notes  1.   Set the baud rate in accordance with the wakeup signal regulations and transmit data of 80H. 

 

2.   A break field is defined to have a width of 13 bits and output a low level.  Where the baud rate for main 

transfer is N [bps], therefore, the baud rate of the break field is calculated as follows. 

 

 

  (Baud rate of break field) = 9/13 

× N     

 

 

By transmitting data of 00H at this baud rate, a break field is generated. 

 

3.   INTST2 is output upon completion of transmission.  INTST2 is also output at BF transmission. 

 

Remark  The interval between fields is controlled by software. 

 

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