|ARM Technical Support Knowledge Articles|
Applies to: PL011 UART
The Stick Parity Select (SPS) bit is used to set either a permanent '1' or a permanent '0' as parity when transmitting or receiving data, depending on the state of the Parity Enable (PEN, bit) and Even Parity Select (EPS, bit) bits in the same register. Its purpose is to typically indicate the first byte of a package. In some situations, this could be an address byte, for example when broadcasting data in a multi-drop RS-485 network. In such a network, only the addressed UART would respond to the data, the others would ignore the broadcast.
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