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By specifying rts=pin(x) and/or cts=Pin(x) in the constructor. The pad numbers for the UART pins are fix in this case: TX must be at pad 0, RX at pad 1, RTS at pad 2 and CTS at pad 3. repr(uart) shows the pin names for rts and cts, if set. In case of a RX overflow, the rx interrupt will be disabled instead of just discarding the data. That allows RTS to act. If RTS is inactive, still 2 bytes can be buffered in the FIFO. Signed-off-by: robert-hh <robert@hammelrath.com>