NEC 78K0/KD1 Series User Manual page 299

(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 Table 14-3).
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 INTSR6 and INTSRE6 by clearing bit 0 (ISRM6) of asynchronous
serial interface operation mode register 6 (ASIM6) to 0.
1. If ISRM6 is cleared to 0 (INTSR6 and 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
CHAPTER 14 SERIAL INTERFACE UART6
Table 14-3. 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 14-18. Reception Error Interrupt
Preliminary User's Manual U16315EJ1V0UD
Cause
(b) Error during reception
INTSR6
INTSRE6
(b) Error during reception
INTSR6
INTSRE6
Value of ASIS6
04H
02H
01H
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