Renesas RL78 Series

RL78/F13, F14 CHAPTER 17 LIN/UART MODULE (RLIN3)
R01UH0368EJ0210 Rev.2.10 1227
Dec 10, 2015
Table 17-19. UART Buffer Transmission Processing in LIN/UART Module (in UART mode)
Step Software processing LIN/UART module processing
(1)
 Sets a baud rate.
 Sets noise filter ON/OFF.
 Sets error detection enable.
 Sets data format.
 Sets an interrupt generation timing to the end of
transmission.
 Clears the LIN/UART module from LIN reset mode.
 Sets the transmit enable bit (UTOE bit) to 1  Waits for a transmission trigger (RTS bit) by software.
(2)
 Sets a UART buffer data length and whether the system
must wait for the start of transmission.
 Sets the transmission data in the UART data buffer 0
register (LUDBn0) and the LIN/UART data buffer m
register (LDBnm).
 Sets the UART buffer transmission start bit (RTS).
 Sets the transmission status flag.
(3)
 Waits for an interrupt request.
 Transmits a start bit (for switching between transmission
and reception in half duplex communication, transmits a
start bit after receiving 1 stop bit. This function is referred to
in 17.5.1 (4) Transmission Start Wait Function).
(4) Transmits the data set in the UART data buffer 0 register
(LUDBn0) and the LIN/UART data buffer m register
(LDBnm).
(5) Transmits a parity bit when parity is used.
(6) Transmits 1 or 2 stop bits
(7) Transmits an inter-byte space (idle).
Repeats steps (3) to (7) until frame count -1 that was set in
the UART buffer data length select bits is reached.
(8) Transmits a start bit.
(9) Transmits the data set in the LIN/UART data buffer m
register (LDBnm).
(10) Transmits a parity bit when parity is used.
(11) Transmits 1 or 2 stop bits.
(12)
 Sets the buffer transmission end flag.
 Clears the UART buffer transmit start (RTS) bit.
 Outputs a transmission interrupt.
 Clears the transmission status flag.
(13)
 Checks the LSTn register and clears flags
 When transmitting data continuously, goes to step (2).
n = 0, 1