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A UART (Universal Asynchronous Receiver Transmitter) is a piece of logic that sends and receives data on a serial port.

3
votes
Nothing, they're just bytes. Why your device produces them and how your terminal emulator interprets them is implementation-specific, but they don't mean anything in a general sense.
answered Sep 4 '15 by Ignacio Vazquez-Abrams
2
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There is no pin change interrupt available on PH1, hence you cannot use SoftwareSerial. You will need to resort to a polled software UART instead. …
answered Aug 31 '14 by Ignacio Vazquez-Abrams
31
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Length/impedance matching is used with multiple signals, differential or single-ended, that must arrive at the same point at the same time. Since UART signals are both asynchronous and in opposite …
answered May 22 '16 by Ignacio Vazquez-Abrams
4
votes
From DS39708, "dsPIC33/PIC24 Family Reference Manual, UART", section 3.0, "UART BAUD RATE GENERATOR": …
answered Dec 17 '14 by Ignacio Vazquez-Abrams
2
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"USART" is... a poor choice for an answer. Transmitting data over the PSTN requires adaptive MOdulation and DEModulation, which are the jobs of a modem. A USART can be used to transmit the data to the …
answered Oct 22 '16 by Ignacio Vazquez-Abrams
2
votes
Is it expected that USART tx/rx gets disturbed by SLEEP_MODE_ADC? Absolutely. Both the USART and timers use clkIO for operation, and this is disabled in ADC Noise Reduction mode. Doe …
answered May 4 '15 by Ignacio Vazquez-Abrams
3
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My question is then, if I am in the middle of transmitting a byte OUT of this data register, how do I prevent an interrupt triggered by a byte coming IN from causing me to lose data? You don't. T …
answered Nov 15 '16 by Ignacio Vazquez-Abrams
4
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Can someone confirm that I can use the USART pins to communicate with a UART module just by using the RX and TX pins? This is correct, provided you configure the USART to operate in asynchronous …
answered Nov 6 '13 by Ignacio Vazquez-Abrams
1
vote
While communications is digital, baud rate is equal to bit rate. Only when the communications is modulated to analog can 1 baud encode more than 1 bit as per the constellation diagram. For buses tran …
answered Jan 30 '16 by Ignacio Vazquez-Abrams
3
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The module does require you to use the UART protocol in order to use it. It is possible to emulate a UART signal via bit banging, but this requires more from the MCU in order to make it work. AVR304 … describes the most efficient way to do this. Fortunately, the USI found in most tinyAVR devices, including the ATtinyX5, can be used as part of a half-duplex UART connection, alleviating some of the load. This is covered in AVR307. …
answered Aug 26 '15 by Ignacio Vazquez-Abrams
4
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AVR274 describes a single-wire, half-duplex software UART. AVR304 describes a half-duplex, interrupt-driven software UART, and AVR305 describes a polled alternative. AVR307 describes implementing a … half-duplex UART using a USI. All code associated with each app note can be downloaded from Atmel's website. …
answered May 24 '15 by Ignacio Vazquez-Abrams
0
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That cable does not provide a UART connection. Instead it connects the USB port directly to the TRRS plug. This is not what you want. Buy or make a real USB-to-UART bridge cable instead. …
answered Dec 21 '14 by Ignacio Vazquez-Abrams