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 13-5. Format of LIN-UARTn Option Register 1 (UFnOPT1) (2/3)
UFnEBC Expansion bit data comparison enable bit
0 No comparison
(INTLRn or INTLSn is always generated upon completion of data reception.)
1 Compares UFnRX register and UFnID register when the level selected for the UFnEBL
bit has been detected as the expansion bit.
(INTLSn is generated only when the UFnRX register and UFnID register have
matched.)
The UFnEBC bit is used to enable comparison between the received data and the UFnID register
when the expansion bit has been enabled (UFnCL = UFnEBE = 1).
Remark The UFnEBC bit becomes valid only if UFnCL = UFnEBE = 1. See 13.8.2 Expansion bit
mode reception (no data comparison) and 13.8.3 Expansion bit mode reception
(with data comparison) for details.
UFnIPCS ID parity check select bit
0 No automatic ID parity check
(Calculating the parity of the PID by using software and checking are required.)
1 Automatic ID parity check
The UFnIPCS bit is used to select how to handle automatic checking of the parity bit of the
received PID, when in automatic baud rate mode (UFnMD1, UFnMD0 = 11B).
If UFnIPCS is “1”, the parity bit is checked when the PID received in LIN communication is stored
into the UFnID register. When an incorrect result has been detected, an ID parity error flag
(UFnIPE) will be set and a status interrupt request signal (INTLSn) will be generated.
Remark The UFnIPCS bit becomes valid only in the automatic baud rate mode (UFnMD1,
UFnMD0 = 11B). See 13.7.3 ID parity check function for details.
UFnACE Automatic checksum enable bit
0 Disables automatic checksum calculation.
Response transmission: Checksum must be calculated by using software and set to a
buffer.
Response reception: Checksum must be calculated from the data stored into the
buffer by using software, and compared and checked with the
checksum obtained via communication.
1 Enables automatic checksum calculation.
Response transmission: Checksum is automatically calculated from the data set to a
buffer and is automatically appended at the end of response
transmission.
Response reception: Checksum is automatically calculated from the data stored
into the buffer and is automatically compared and checked
with the checksum obtained via communication.
The UFnACE bit is used to select how to handle automatic checksum calculation during response
transmission and response reception, when in automatic baud rate mode (UFnMD1, UFnMD0 =
11B).
When response reception is performed while UFnACE is “1”, the checksum received in LIN
communication will be checked when it is stored into a receive buffer. When an incorrect result
has been detected, a checksum error flag (UFnCSE) will be set and a status interrupt request
signal (INTLSn) will be generated.
Remark The UFnACE bit becomes valid only in the automatic baud rate mode (UFnMD1, UFnMD0
= 11B). See 13.7.4 Automatic checksum function for details.
R01UH0317EJ0004 Rev. 0.04 692
Feb. 22, 2013