CHAPTER 12 SERIAL INTERFACE UART6
Preliminary User’s Manual U16846EJ1V0UD
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Figure 12-2. LIN Reception Operation
Sleep
bus
13 bits
Note 2
SF
reception
ID
reception
Data
reception
Data
reception
Data
reception
Note 5
Note 3
Note 1
Note 4
Wakeup
signal frame
Synchronous
break field
Synchronous
field
Indent
field
Data field
Data field
Checksum
field
RX6
SBF
reception
Reception interrupt
(INTSR6)
Edge detection
(INTP0)
Capture timer
Disable
Enable
Disable
Enable
Notes 1. The wakeup signal is detected at the edge of the pin, and enables UART6 and sets the SBF reception
mode.
2. Reception continues until the STOP bit is detected. When an SBF with low-level data of 11 bits or
more has been detected, it is assumed that SBF reception has been completed correctly, and an
interrupt signal is output. If an SBF with low-level data of less than 11 bits has been detected, it is
assumed that an SBF reception error has occurred. The interrupt signal is not output and the SBF
reception mode is restored.
3. If SBF reception has been completed correctly, an interrupt signal is output. This SBF reception
completion interrupt enables the capture timer. Detection of errors OVE6, PE6, and FE6 is
suppressed, and error detection processing of UART communication and data transfer of the shift
register and RXB6 is not performed. The shift register holds the reset value FFH.
4. Calculate the baud rate error from the bit length of the synchronous field, disable UART6 after SF
reception, and then re-set baud rate generator control register 6 (BRGC6).
5. Distinguish the checksum field by software. Also perform processing by software to initialize UART6
after reception of the checksum field and to set the SBF reception mode again.
To perform a LIN receive operation, use a configuration like the one shown in Figure 12-3.
The wakeup signal transmitted from the LIN master is received by detecting the edge of the external interrupt
(INTP0). The length of the synchronous field transmitted from the LIN master can be measured using the external
event capture operation of 16-bit timer/event counter 00, and the baud rate error can be calculated.
The input signal of the reception port input (RxD6) can be input to the external interrupt (INTP0) and 16-bit
timer/event counter 00 by port input switch control (ISC0/ISC1), without connecting RxD6 and INTP0/TI000 externally.