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BIT NAME Function
7 - Always clear
6 - Always clear
5 FE Frame error, set if error (FE = ~S2)
4 RXDB Value of RXD pin on BLINK
3 TCLK Internal transmit clock
2 RCLK Internal receive clock
1 PAR Parity or first stop bit (PAR = S1)
0 START Start bit (should be zero)
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