BGDM=0, RXDESEL=0, ABCSE=0, BRME=0, ABCS=0, NFEN=0
Serial Extended Mode Register
| Reserved | This bit is read as 0. The write value should be 0. |
| Reserved | This bit is read as 0. The write value should be 0. |
| BRME | Bit Modulation Enable 0 (0): Bit rate modulation function is disabled. 1 (1): Bit rate modulation function is enabled. |
| ABCSE | Asynchronous Mode Extended Base Clock Select1 (Valid only in asynchronous mode and SCR.CKE[1]=0) 0 (0): Clock cycles for 1-bit period is decided with combination between BGDM and ABCS in SEMR. 1 (1): Baud rate is 6 base clock cycles for 1-bit period and the clock of a double frequency is output from the baud rate generator. |
| ABCS | Asynchronous Mode Base Clock Select (Valid only in asynchronous mode) 0 (0): Selects 16 base clock cycles for 1-bit period. 1 (1): Selects 8 base clock cycles for 1-bit period. |
| NFEN | Digital Noise Filter Function Enable (The NFEN bit should be 0 without simple I2C mode and asynchronous mode.) In asynchronous mode, for RXDn input only. In simple I2C mode, for RXDn/TxDn input. 0 (0): Noise cancellation function for the RXDn/TXDn input signal is disabled. 1 (1): Noise cancellation function for the RXDn/TXDn input signal is enabled. |
| BGDM | Baud Rate Generator Double-Speed Mode Select (Only valid the CKE[1] bit in SCR is 0 in asynchronous mode). 0 (0): Baud rate generator outputs the clock with normal frequency. 1 (1): Baud rate generator outputs the clock with doubled frequency. |
| RXDESEL | Asynchronous Start Bit Edge Detection Select (Valid only in asynchronous mode) 0 (0): The low level on the RXDn pin is detected as the start bit. 1 (1): A falling edge on the RXDn pin is detected as the start bit. |