UPD78F0411GA-GAM-AX Datasheet, PDF (339/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 14 SERIAL INTERFACE UART6
LIN Bus
Figure 14-2. LIN Reception Operation
Wakeup
signal frame
Sync
break field
Sync field
Identifier Data field Data field Checksum
field
field
RXD6
(input)
Disable
13-bit
SBF reception
<2>
Enable
SF
reception
ID
Data
Data
Data
reception reception reception reception
<5>
<3>
Reception interrupt
(INTSR6)
<1>
Edge detection
(INTP0)
Capture timer
Disable
<4>
Enable
Reception processing is as follows.
<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. Start 16-bit timer/event counter
00 by the SBF reception end interrupt servicing and measure the bit interval (pulse width) of the sync field
(see 6.4.8 Pulse width measurement operation). 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 interval of the sync 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.
Figure 14-3 shows the port configuration for LIN reception operation.
The wakeup signal transmitted from the LIN master is received by detecting the edge of the external interrupt
(INTP0). The length of the sync 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 source 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.
User’s Manual U18698EJ1V0UD
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