UART : Protocol Summary

In asynchronous transmission, each byte (character) is packed between start and stop bits.

• Start bit is always 1 bit, the value of the start bit is always 0
• Stop bit can be 1 or 2 bits, the value of the stop bit is always 1

E.g.

Transmitting ASCII 'A' = 0100 0001

One Frame:

11 0100 0001 0

Stop bit "A" Start bit

configuration parameters

• Baudrate: Connection speed expressed in bits per second
• Stop Bit :Number of stop bits transmitted, can be one or two
• Parity: Indicates the parity mode, whether odd or even. Used for error checking.
• Mode: Specifies whether RX or TX mode is enabled or disabled.
• Word Length: Specifies the number of data bits transmitted or received. Can be 8-bits or 9-bits.
• Hardware Flow Control: Specifies whether Hardware Flow Control is enabled or disabled.