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)
(11) 8-bit transmit data register for LIN-UARTn wait (UFnWTX)
The UFnWTX register is a 16-bit register dedicated to delaying starting transmission until the stop bit of reception
is completed during a LIN communication.
This register is write-only, in 16-bit units. When the UFnWTX register is write in 8-bit units, it can be accessed as
the UFnWTXB register.
The stop bit length of reception when reception is switched to transmission is guaranteed for the UFnWTX register.
See 13.5.11 Transmission start wait function for details.
The UFnTX register value will be read when the UFnWTX register has been read.
Reset input sets this register to 0000H.
Figure 13-11. Format of 8-bit transmit data register for LIN-UARTn wait (UFnWTX)
Address: F024AH, F024BH (UF0WTX), F026AH, F026BH (UF1WTX) After reset: 0000H W
15 14 13 12 11 10 9 8
UFnWTX 0 0 0 0 0 0 0 UFnWTX8
(n = 0, 1) 7 6 5 4 3 2 1 0
UFnWTX7 UFnWTX6 UFnWTX5 UFnWTX4 UFnWTX3 UFnWTX2 UFnWTX1 UFnWTX0
Cautions 1. Writing to the UFnWTX register is prohibited other than when reception is switched to
transmission (such as during transmission).
2. When the UFnWTX register is accessed in 8-bit units (when the UFnWTXB register is
accessed), “0” is written to the UFnWTX8 bit.
3. Writing to the UFnWTX register is prohibited when using the UFnBUF0 to UFnBUF8 registers.
Remark The UFnWTX8 bit is an expansion bit when expansion bits are enabled (UFnEBE = UFnCL = 1).
R01UH0317EJ0004 Rev. 0.04 705
Feb. 22, 2013