# USART ## Usage USART peripherals typically have a register setting which can select either synchronous ([SPI](/electronics/general/spi.md)) or asynchronous ([UART](/electronics/general/uart.md)) mode. This makes these peripherals very flexible. However, switching back and forth between the two is not recommended, due to initialization timing glitches which may confuse connected devices. ### Teams Contributed to this Article: * [BLRS](https://purduesigbots.com/) (Purdue SIGBots) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://wiki.purduesigbots.com/electronics/general/usart.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.