NEC 78K0 User Manual page 288

(f) Reception error
Three types of errors may occur during reception: a parity error, framing error, or overrun error. If the error
flag of asynchronous serial interface reception error status register 6 (ASIS6) is set as a result of data
reception, a reception error interrupt request (INTSR6/INTSRE6) is generated.
Which error has occurred during reception can be identified by reading the contents of ASIS6 in the reception
error interrupt servicing (INTSR6/INTSRE6) (refer to Figure 13-6).
The contents of ASIS6 are reset to 0 when ASIS6 is read.
Reception Error
Parity error
Framing error
Overrun error
The error interrupt can be separated into reception completion interrupt (INTSR6) and error interrupt
(INTSRE6) by clearing bit 0 (ISRM6) of asynchronous serial interface operation mode register 6 (ASIM6) to
0.
1. If ISRM6 is cleared to 0 (reception completion interrupt (INTSR6) and error interrupt (INTSRE6) are
separated)
(a) No error during reception
INTSR6
INTSRE6
2. If ISRM6 is set to 1 (error interrupt is included in INTSR6)
(a) No error during reception
INTSR6
INTSRE6
288
CHAPTER 13 SERIAL INTERFACE UART6
Table 13-3. Cause of Reception Error
The parity specified for transmission does not match the parity of the
receive data.
Stop bit is not detected.
Reception of the next data is completed before data is read from
receive buffer register 6 (RXB6).
Figure 13-20. Reception Error Interrupt
User's Manual U16227EJ2V0UD
Cause
(b) Error during reception
INTSR6
INTSRE6
(b) Error during reception
INTSR6
INTSRE6