RL78/F13, F14 CHAPTER 17 LIN/UART MODULE (RLIN3)
R01UH0368EJ0210 Rev.2.10 1243
Dec 10, 2015
17.5.5 Error Status
In UART mode, the LIN/UART module can detect four types of errors and two types of statuses. The condition of these error
statuses can be checked by means of the corresponding bits in the LESTn register.
Table 17-27 lists applicable error status types.
Table 17-27.
Types of Error Statuses in UART Mode
Status Error detection condition Communication
Enable/disable
detection
Corresponding
bit
Bit error The transmitted data and the data monitored
on the receive pin do not match
Note 1
Continues until the
transmission of the set
transmission data is finished.
O BER flag in
LESTn register
Overrun error After received data is stored in the LURDRn
register, another data item is received before
the data is read.
(In this case, no data is stored in the
LURDRn register).
―
(Reception is finished by the
time this error is detected)
O OER flag in
LESTn register
Framing error When the first stop bit at the first bit is low in
the reception processing.
―
(Reception is finished by the
time this error is detected)
O FER flag in
LESTn register
Parity error The received parity value fails to match the
parity value calculated from the received
data
Continues until the data
reception is finished.
×
Note 2
UPER flag in
LESTn register
Expansion bit
detection
The value of the received expansion bit
matches the value of the UEBDL bit in the
LUORn1 register.
― O EXBT flag in
LESTn register
ID match The value of the received expansion bit
matches the value of the UEBDL bit in the
LUORn1 register and the 8-bit received data
excluding the expansion bit matches the
value of the LIDBn register.
― O IDMT flag in
LESTn register
Notes 1. If data is transmitted from the UART buffer, a bit error is also detected in the space between UART frames
(inter-byte space).
2. Setting the UPS[1:0] bits in the LBFCn register to 10b (0 parity) disables the checking of parity bit values. In
this case, no parity error is generated.
Caution The error status is cleared when cleared by software or after transition to LIN reset mode.
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