Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 17 ASYNCHRONOUS SERIAL INTERFACE C (UARTC)
R01UH0042EJ0500 Rev.5.00 Page 741 of 1513
Aug 12, 2011
17.6.2 SBF transmission/reception format
The V850ES/JG3-H and V850ES/JH3-H have an SBF (Sync Break Field) transmission/reception control function to
enable use of the LIN function.
Remark LIN stands for Local Interconnect Network and is a low-speed (1 to 20 kbps) serial communication protocol
intended to aid the cost reduction of an automotive network.
LIN communication is single-master communication, and up to 15 slaves can be connected to one master.
The LIN slaves are used to control the switches, actuators, and sensors, and these are connected to the LIN
master via the LIN network.
Normally, the LIN master is connected to a network such as CAN (Controller Area Network).
In addition, the LIN bus uses a single-wire method and is connected to the nodes via a transceiver that
complies with ISO9141.
In the LIN protocol, the master transmits a frame with baud rate information and the slave receives it and
corrects the baud rate error. Therefore, communication is possible when the baud rate error in the slave is
±15% or less.
Figures 17-8 and 17-9 outline the transmission and reception manipulations of LIN.
Figure 17-8. LIN Transmission Manipulation Outline
LIN
bus
Wake-up
signal
frame
Sync
break
field
Sync
field
Identifier
field
DATA
field
DATA
field
Check
SUM
field
INTUCnT
interrupt
TXDCn (output)
Note 3
8 bits
Note 1
Note 2
13 bits
SBF transmission
Note 4
55H
transmission
Data
transmission
Data
transmission
Data
transmission
Data
transmission
Notes 1. The interval between each field is controlled by software.
2. SBF output is performed by hardware. The output width is the bit length set by the
UCnOPT0.UCnSLS2 to UCnOPT0.UCnSLS0 bits. If even finer output width adjustments are
required, such adjustments can be performed using the UCnCTL2.UCnBRS7 to
UCnCTL2.UCnBRS0 bits.
3. 80H transfer in the 8-bit mode is substituted for the wakeup signal frame.
4. A transmission enable interrupt request signal (INTUCnT) is output at the start of each transmission.
The INTUCnT signal is also output at the start of each SBF transmission.