CHAPTER 10 SERIAL INTERFACE FUNCTION
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(3) Asynchronous serial interface status register 1 (ASIS1)
The ASIS1 register is a register that is configured of a UART1 transmission status flag (SOT1), reception
status flag (SIR1), a bit (RB8) indicating the 9th bit when extension bit addition is enabled, and 3-bit error
flags (PE1, FE1, OVE1) that indicate the error status at reception end.
The status flag that indicates reception errors always indicates the most recent error status. In other words, if
the same error occurs several times before receive data is read, this flag holds only the status of the error
that occurred last.
Each time the ASIS1 register is read after a reception completion interrupt (INTSR1), read the reception
buffer (RXB1 or RXBL1). The error flag is cleared when the reception buffer (RXB1 or RXBL1) is read.
Also, clear the error flag by reading the reception buffer (RXB1 or RXBL1) when a reception error occurs.
This register is read-only, in 8-bit or 1-bit units.