R8CSLASH20 datasheet(373/501 Pages) RENESAS

373 / 501 page

R8C/20 Group, R8C/21 Group

17. Hardware LIN

Rev.2.00 Aug 27, 2008

Page 357 of 458

REJ09B0250-0200

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 register

← 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

statu s flag , sto p th e

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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