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Chapter 3 Jumpers and Switches
© Fujitsu Semiconductor Europe GmbH
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FMEMCU-UG-960031-13
3.10 LIN / UART
There are two identical circuit blocks for LIN or RS232 connections. Each of the two D-Sub
connectors can be configured as LIN or RS232 interface. DTS or RTS can be selected as
reset source, and RTS and CTS can be connected by a jumper, since some terminals and
Flash programming tools need this connection. Pin 1 (Vs) of X5 and X9 can be connected to
the voltage input of the board by jumpers in order to supply the LIN bus.
3.10.1 LIN-UART 0 (JP: 19, 21, 23, 25, 27, 28, 29, 31)
Jumper
Setting
Description
JP21
(RXD)
1-2
SIN0 is connected to RS232 transceiver
2-3
SIN0 is connected to LIN transceiver
JP25
(TXD)
1-2
SOT0 is connected to RS232 transceiver
2-3
SOT0 is connected to LIN transceiver
JP27
(RS232/LIN)
1-2
X5 pin 2 is connected to RS232 transceiver
2-3
X5 pin 2 is connected to LIN transceiver
JP19
(RTS-CTS)
Closed
RTS and CTS of X5 are connected
Open
RTS and CTS of X5 are not connected
JP23
(DTR/RTS)
1-2
DTR signal (pin 6 of X5) is used as reset source
2-3
RTS signal (pin 7 of X5) is used as reset source
JP29
(LIN enable)
Closed
LIN transceiver is enabled
Open
LIN transceiver is disabled
JP31
(LIN master)
Closed
LIN-UART0 is LIN Master
Open
LIN-UART0 is LIN Slave
JP28
(LIN Vbat)
Closed
LIN bus (X5 pin 1) is powered by the board
Open
LIN bus (X5 pin 1) is not powered by the board
Table 3-9: UART0 Settings
