R28 datasheet(344/473 Pages) RENESAS

344 / 473 page

R8C/28 Group, R8C/29 Group

17. Hardware LIN

Rev.2.10

Sep 26, 2008

Page 325 of 441

REJ09B0279-0210

17.4.4

Hardware LIN End Processing

Figure 17.12 shows an Example of Hardware LIN Communication Completion Flowchart.

Use the following timing for hardware LIN end processing:

• If the hardware bus collision detection function is used

Perform hardware LIN end processing after checksum transmission completes.

• If the bus collision detection function is not used

Perform hardware LIN end processing after header field transmission and reception complete.

Figure 17.12

Example of Hardware LIN Communication Completion Flowchart

Hardware LIN

Clear the status flags

(Bus collision detection, Synch Break

detection, Synch Field measurement)

Bits B2CLR, B1CLR, B0CLR in the LINST

← 0

Timer RA

Read the count status flag

TCSTF flag in TRACR register

UART0 Complete transmission via UART0

When the bus collision

detection function is not used,

end processing for the UART0

transmission is not required.

TCSTF = 0 ?

YES

Set the timer to stop counting.

Zero to one cycle of the timer

RA count source is required

after timer RA starts counting

before the TCSTF flag is set to

After clearing hardware LIN

status flag, stop the hardware

LIN operation.

Timer RA

Set the timer to stop counting

TSTART bit in TRACR register

← 0

Hardware LIN

Set the LIN operation to stop

LINE bit in the LINCR register

← 0

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