shifter := Cat(io.in.bits, Bits(0, 1))
counter := Mux1H((0 until uartStopBits).map(i =>
(io.nstop === UInt(i)) -> UInt(n + i + 1)))
shifter := Cat(io.in.bits, Bits(0, 1))
counter := Mux1H((0 until uartStopBits).map(i =>
(io.nstop === UInt(i)) -> UInt(n + i + 1)))