UART module

UARTBit Time and Baud Rate• The bit time (units of time) is the time from the start of oneserial data bit value to the start of another.• The inverse of the bit time is the baud rate (units of frequency,Hz – however the units are normally omitted).• RS-232 baud rates are integer multiples and sub-multiples of9600 (Hz).Synchronization Point• RS-232 idles at a logic 1.• A frame always starts with either an idle-to-start-bit or a stopbit-to-start-bittransition.• Either way, the frame always starts with a logic 1 to logic 0transition.• The UART looks for 1→0 for the start of the first frame and thenlooks for 1→0 after 9.5BT for the start of each subsequentframe.