DLAB =1. 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.
DLMSB | The UART1 Divisor Latch MSB Register, along with the U1DLL register, determines the baud rate of the UART1. |
RESERVED | Reserved. Read value is undefined, only zero should be written. |