RL78/D1A User's Manual: Hardware - Renesas

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RL78/D1A CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF)
13.5.10 Status interrupt generation sources
Status interrupt generation sources include parity errors, framing errors, overrun errors, data consistency errors which
occur only during LIN communication, successful BF reception, ID parity errors, checksum errors, and response
preparation errors which occur only in automatic baud rate mode, and ID matches and expansion bit detections which
occur only when expansion bits are enabled. When these sources are detected, a status interrupt request signal (INTLSn)
is generated. The type of a generation source can be referenced by using the status register (UFnSTR). The content of
processing is determined by referencing the UFnSTR register in the status interrupt servicing routine.
Status flags must be cleared by writing “1” to the corresponding bits (excluding the UFnTSF and UFnRSF bits of the
UFnSTC register) by using software.
The status interrupt generation timing and status flag change timing differ, depending on the mode setting and
generation source.
Table 13-3. Status Interrupt Generation Sources
Status Flag Generation Source Description
UFnPE Parity error The parity calculation result of receive data and the value of the
received parity bit do not match.
UFnFE Framing error No stop bit is detected.
(A low level is detected at a stop bit position.)
UFnOVE Overrun error The next data reception is completed before the receive data
transferred to the receive data register is read.
UFnDCE Data consistency error The data consistency check selection bit (UFnDCS) is set, and the
values of transmit data and receive data do not match during data
transmission. Transmission operation and reception operation are
out of synchronization.
UFnBSF Successful BF reception A new BF is successfully received when in BF reception enable
mode during communication (UFnMD1, UFnMD0 = 10B). (This
occurs also when the master transmits a BF.)
UFnIPE ID parity error Either parity bit of the received PID includes an error.
UFnCSE Checksum error The result of comparing the checksum received during response
reception and the automatically calculated result is illegal.
UFnRPE Response preparation Response preparation could not be performed before reception of
error
the first byte by a response was completed.
UFnIDM ID match When the following conditions are satisfied:
- Comparison of expansion bit data is enabled (UFnEBC = 1).
- The expansion bit is at the level set by using the expansion bit
detection level selection bit (UFnEBL).
- The received data matches the value of the UFnID register.
UFnEBD Expansion bit detection The level set by using the expansion bit detection level select bit
(UFnEBL) is detected at a receive data expansion bit.
Remark n = 0, 1
R01UH0317EJ0004 Rev. 0.04 745
Feb. 22, 2013