RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 669
Sep 22, 2011
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 12-99 outlines a transmission operation of LIN.
Figure 12-99. Transmission Operation of LIN
LIN Bus
Wakeup signal
frame
8 bits
Note 1
55H
transmission
Data
transmission
Data
transmission
Data
transmission
Data
transmission
13-bit SBF
transmission
Note 2
Sync break
field
Sync field Identification
field
Data field Data field Checksum
field
T
X
D2
(output)
INTST2
Note 3
Notes 1. The baud rate is set so as to satisfy the standard of the wakeup signal and data of 00H is transmitted.
2. A sync 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 sync break field is calculated as follows.
(Baud rate of sync break field) = 9/13 × N
By transmitting data of 00H at this baud rate, a sync break field is generated.
3. INTST2 is output upon completion of transmission. INTST2 is also output when SBF transmission is
executed.
Remark The interval between fields is controlled by software.
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