RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF)
Figure 13-17. Format of LIN-UARTn Buffer Control Register (UFnBUCTL) (2/2)
UFnNO No-response request bit
0 Response for received PID is present.
1 Response for received PID is absent.
The UFnNO bit is used when a PID (PID received by a header) stored into the UFnID register is
excluded in automatic baud rate mode (UFnMD1, UFnMD0 = 11B). After setting the UFnNO bit, the
bit will be cleared automatically when the next BF-SF reception is complete. It can be set only in
automatic baud rate mode (UFnMD1, UFnMD0 = 11B). The UFnNO bit is automatically cleared at
the reception complete timing after the next BF and SF are received.
See 13.7 LIN Communication Automatic Baud Rate Mode for details.
Caution Do not set the UFnTRQ and UFnRRQ bits while the UFnNO bit is “1”.
Simultaneous rewriting is prohibited.
UFnRRQ Reception request bit
0 Storing has been started/no reception request
1 Reception start request/during receive operation in automatic baud rate mode
The UFnRRQ bit is used to request starting of storing data into a buffer. It is cleared when a
reception completion interrupt for the buffer is generated. It can be set only in automatic baud rate
mode (UFnMD1, UFnMD0 = 11B).
See 13.7 LIN Communication Automatic Baud Rate Mode for details.
Caution Do not set the UFnNO and UFnTRQ bits while the UFnRRQ bit is “1”.
Simultaneous rewriting is prohibited.
UFnTRQ Transmission request bit
0 Storing has been started/no transmission request
1 Transmission start request/during transmit operation when using buffer
The UFnTRQ bit is used to request starting of transmitting buffer data. It is cleared when a
transmission interrupt for the data prepared in the buffer is generated. It can be set only in normal
UART mode (UFnMD1, UFnMD0 = 00B) or automatic baud rate mode (UFnMD1, UFnMD0 = 11B).
See 13.6.1 UART buffer mode transmission and 13.7 LIN Communication Automatic Baud
Rate Mode for details.
Caution Do not set the UFnNO and UFnRRQ bits while the UFnTRQ bit is “1”.
Simultaneous rewriting is prohibited.
UFnBUL3 to UFnBUL0 Buffer length bits
0 Transmits or receives 9 bytes.
1 to 9 Transmits or receives number of bytes set.
10 to 15 Transmits or receives 9 bytes.
The UFnBUL3 to UFnBUL0 bits are used to set the number of transmit or receive data in a buffer.
The read value is the pointer of the current buffer. The bits are valid only in normal UART mode
(UFnMD1, UFnMD0 = 00B) or automatic baud rate mode (UFnMD1, UFnMD0 = 11B).
See 13.6.1 UART buffer mode transmission and 13.7 LIN Communication Automatic Baud
Rate Mode for details.
R01UH0317EJ0004 Rev. 0.04 712
Feb. 22, 2013