NEC 78K0 Series User Manual page 374

(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 (INTSR6/INTSRE6) servicing (see Figure 15-6).
The contents of ASIS6 are cleared to 0 when ASIS6 is read.
Reception Error
Parity error
Framing error
Overrun error
The reception 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
374
CHAPTER 15 SERIAL INTERFACE UART6
Table 15-3. 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 15-20. Reception Error Interrupt
Preliminary User's Manual U17260EJ3V1UD
Cause
(b) Error during reception
INTSR6
INTSRE6
(b) Error during reception
INTSR6
INTSRE6