USART Baud Rate 0 Register Low
| Bit7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| (UBBR0[7:0]) UBBR0L | |||||||
| AccessR/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W |
| Reset0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
USART Baud Rate 0
UBBR0H and UBBR0L are combined into UBBR0. It means UBBR0L[7:0] is UBBR0[7:0]. This is a 12-bit register which contains the USART baud rate. The UBBR0H contains the four most significant bits and the UBBR0L contains the eight least significant bits of the USART baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud rate is changed. Writing UBRR0L will trigger an immediate update of the baud rate prescaler.