R8C2K datasheet(362/471 Pages) RENESAS

362 / 471 page

R8C/2K Group, R8C/2L Group

18. Hardware LIN

Rev.1.10

Dec 21, 2007

Page 345 of 450

REJ09B0406-0110

18.4.4

Hardware LIN End Processing

Figure 18.12 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 18.12

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

← 1

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 1.

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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