RL78/F13, F14 CHAPTER 17 LIN/UART MODULE (RLIN3)
R01UH0368EJ0210 Rev.2.10 1133
Dec 10, 2015
RFT bit (response field communication direction select bit)
The RFT bits set the direction of the response field/wake-up signal communication.
With 0 set, reception is performed in the response field. In LIN wake-up mode, wake-up reception is performed (low width
of the input signal is counted).
With 1 set, transmission is performed in the response field. In LIN wake-up mode, wake-up transmission is performed.
Set this bit when the FTS bit in the LTRCn register is 0 (frame transmission or wake-up transmission/reception is halted).
When response data of 9 bytes or more is to be transmitted or received, do not change the RFT bit setting after the first data
group through the last data group.
CSM bit (checksum select bit)
The CSM bit sets the checksum mode.
With 0 set, classic checksum mode is selected.
With 1 set, enhanced checksum mode is selected.
When the timeout error is used (the FTERE bit in the LEDEn register is 1), the specific timeout time depends on the setting
of this bit. For details of the bit error, refer to 17.4.6 Error Status.
Set this bit when the FTS bit in the LTRCn register is 0 (frame transmission or wake-up transmission/reception is halted).
When response of 9 bytes or more is to be transmitted or received, do not change the CSM bit setting after the first data
group through the last data group.
During communication of response data of 9 bytes or more, only the last data group (the LSS bit is 0) includes the checksum,
and no other groups (the LSS bit is 1) include the checksum.
FSM bit (frame separate mode select bit)
The FSM bit sets the response communication mode.
With 0 set, frame separate mode is not selected. In this case, after header transmission is started (the FTS bit in the LTRCn
register is 1), response is transmitted/received without the RTS bit in the LTRCn register being set.
With 1 set, frame separate mode is selected. If the RTS bit in the LTRCn register is set to 1 during header transmission,
response is transmitted after successful header transmission.
For response reception (the RFT bit is 0), set the FSM bit to 0.
When causing a transition to LIN self-test mode, set this bit to 0 before transition.
For details of frame separate mode, refer to 17.4.3 (1) (a) Frame Separate Mode.
Set this bit when the FTS bit in the LTRCn register is 0 (frame transmission or wake-up transmission/reception is halted).
When response data of 9 bytes or more is to be transmitted or received, set the FSM bit to 1.
LSS bit (transmission/reception continuation select bit)
The LSS bit shows that the next data group to be transmitted or received is not the last one when response data of 9 bytes
or more is to be transmitted or received.
With 0 set, data and checksum are transmitted or received because the next data group to be transmitted or received is the
last one.
With 1 set, only data is transmitted or received, and the checksum is not included because the next data group to be
transmitted or received is not the last one.
Set the LSS bit only when the FSM bit is 1 (frame separate mode) and response data of 9 bytes or more is to be transmitted
or received.
Set this bit while the RTS bit in the LTRCn register is 0 (response transmission/reception stopped).
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