R28 datasheet(338/473 Pages) RENESAS

338 / 473 page

R8C/28 Group, R8C/29 Group

17. Hardware LIN

Rev.2.10

Sep 26, 2008

Page 319 of 441

REJ09B0279-0210

Figure 17.6

Example of Header Field Transmission Flowchart (2)

Timer RA Set the timer to start counting

TSTART bit in TRACR register

← 1

Timer RA Read the count status flag

TCSTF flag in TRACR register

Hardware LIN Read the Synch Break detection flag

SBDCT flag in LINST register

Timer RA Set the timer to stop counting

TSTART bit in TRACR register

← 0

Timer RA Read the count status flag

TCSTF flag in TRACR register

UART0 Communication via UART0

TE bit in U0C1 register

← 1

U0TB register

← 0055h

The timer RA interrupt may be used

to terminate generation of Synch

Break.

One to two cycles of the CPU clock

are required after Synch Break

generation completes before the

SBDCT flag is set to 1.

Transmit the ID field.

TCSTF = 1 ?

SBDCT = 1 ?

YES

TCSTF = 0 ?

YES

UART0 Communication via UART0

U0TB register

← ID field

YES

If registers TRAPRE and TRA for timer

RA do not need to be read or the

changed after writing 0 to the TSTART

bit, the procedure for reading TCSTF

flag = 0 can be omitted.

Zero to one cycle of the timer RA count

source is required after timer RA stops

counting before the TCSTF flag is set

to 0.

Transmit the Synch Field.

After timer RA Synch Break is

generated, the timer should be made

to stop counting.

If registers TRAPRE and TRA for

timer RA do not need to be read or

the register settings do not need to be

changed after writing 1 to the

TSTART bit, the procedure for reading

TCSTF flag = 1 can be omitted.

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.

Timer RA generates Synch Break.

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