Fujitsu FR81S User Manual

CHAPTER 40: MULTI-FUNCTION SERIAL INTERFACE

7. Operation of LIN Interface (v2.1)

FUJITSU SEMICONDUCTOR LIMITED

CHAPTER : MULTI-FUNCTION SERIAL INTERFACE

FUJITSU SEMICONDUCTOR CONFIDENTIAL

315

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Slave operation

Figure 7-73 Example of a Flowchart in LIN Communication Slave Mode

(Automatic baud rate can be adjusted (SACSR:AUTE=1), without Using FIFO)

start

Initial setting：

Sets the operating mode to 3 and sets it

to slave operation.

TXE=1,TIE=0,RXE=0,RIE=1

AUTE=1,LBIE=1,SFDE=1

RXE=0

LBD=1

(LIN Break field detect)

LBD=0

RXE=1

SFD=0

RDRF=1

Reception interrupt

ID Field 受信*1

Data Field

reception ?

Data 1 reception *1

RDRF=1

Transmission interrupt

RDRF=1

Reception interrupt

Data N reception *1

Transmission Data 1 setting：TDR=Data1

TIE=1

Transmission Data 2setting：TDR=Data2

TDRE=1

Transmission interrupt

RDRF=1

Reception interrupt

Data 1 reception *1

TDRE=1

Transmission reception

Transmission Data N setting：

TDR=DataN

RDRF=1

Reception interrupt

Data N reception *1

Error ?

Error handling * 2

No(transmission)

Yes(reception)

Yes

Sleep mode ?

Yes

Wake-Up

reception ?

Wake-Up

transmission ?

Wake-Up code

transmission

Yes

*1：if an error occurs, handle the error.

*2：when the FRE and ORE bits are “1”, write “1” to the

SSR:REC bit and clear the error flag.

(Note)

Detect and properly handle errors in each process

Yes

SFD=1
（

SyncFiled reception）

MB91520 Series

MN705-00010-1v0-E

1628