Divisor Latch MSB. Most significant byte of the baud rate divisor value. The full divisor is used to generate a baud rate from the fractional rate divider (DLAB = 1).
| DLMSB | Divisor latch MSB. The USART Divisor Latch MSB Register, along with the DLL register, determines the baud rate of the USART. |
| RESERVED | Reserved |