R8C/20 Group, R8C/21 Group 17. Hardware LIN
Rev.2.00 Aug 27, 2008 Page 356 of 458
REJ09B0250-0200
17.4.3 Bus Collision Detection Function
The bus collision detection function can be used when UART0 is enabled for transmission (TE bit in the U0C1
register = 1).
Figure 17.11 shows a Typical Operation when a Bus Collision is Detected.
Figure 17.11 Typical Operation when a Bus Collision is Detected
TXD0 pin
1
0
RXD0 pin
1
0
Transfer clock
1
0
LINE bit in the
LINCR register
1
0
TE bit in the U0C1
register
1
0
BCDCT flag in the
LINST register
1
0
IR bit in the TRAIC
register
1
0
Cleared to 0 upon
acceptance of interrupt
request or by a program
Set by writing 1 to
the B2CLR bit in the
LINST register
Set to 1 by a program
Set to 1 by a program
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