Differences

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--- glossary:glossary_u [2021/03/21 00:14] – [USB] Expand the definition tgerbic
+++ glossary:glossary_u [2021/09/24 02:59] (current) – Added the actual USI entry on the glossary_u page Wayne
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-=====UART=====
+=====UART or USART=====
 **U**niversal **A**synchronous **R**eceiver / **T**ransmitter
+**U**niversal **A**synchronous / **S**ynchronous **R**eceiver / **T**ransmitter
+A UART is a logic IC that typically converts parallel data to an asynchronous (async) serial stream or its reverse. Some UARTs also incorporate data buffers, serial clock circuits and control line logic/signals.  The most common type of UARTs people are familiar with have been used in personal computers as asynchronous serial ports for MODEMs, printers and terminals.
+In addition to the UART, there is a similar IC called a USART. This IC also includes additional circuitry to support synchronous (sync) serial communications.
+The terms async and sync serial differ in the way they are transmitted. Sync serial has the transmitter and receiver clocked at exactly the same rate so it is clear where every bit of data is located in the serial stream.
+Async serial differs in that the transmitter and receiver only need to be close in clock speed and the receiver samples the incoming data stream to determine where the start of the serial data occurs and where the data bits are.
 ===== Unregulated power supply =====
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 \\ [[http://www.usb.org|http://www.usb.org]]
+===== USI =====
+The Universal Serial Interface is a multi purpose hardware resource which provide the basic hardware for various serial communications and is faster and more reliable than implementing it in software.. A little more information of it's use in MERG is at: [[arduino:spi|Arduino Use of SPI and USI]]