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Update reference.rst

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Develo 2020-08-13 16:17:13 -04:00 committed by GitHub
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@ -160,8 +160,9 @@ The ``::setRxBufferSize(size_t size)`` method changes the RX buffer size as need
should be called before ``::begin()``. The size argument should be at least large enough
to hold all data received before reading.
For transmit-only operation, the buffer can be switched off o save RAM by passing mode
SERIAL_TX_ONLY to Serial.begin(). Other modes are SERIAL_RX_ONLY and SERIAL_FULL (the default).
For transmit-only operation, the 256-byte RX buffer can be switched off to save RAM by
passing mode SERIAL_TX_ONLY to Serial.begin(). Other modes are SERIAL_RX_ONLY and
SERIAL_FULL (the default).
Receive is interrupt-driven, but transmit polls and busy-waits. Blocking behavior is as follows:
The ``::write()`` call does not block if the number of bytes fits in the current space available