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Renesas Singapore - Knowledgebase

Time Between Writing to SCI TDR Register and Transmission Start

Last Updated:06/08/2017


How long does it take to start a transmission after writing the TDR register of the SCI?


When writing the TDR register by asynchronous operation (UART) or a clock synchronization operation, a delay occurs between writing to the register and data transmission, depending on the timing when writing to the TDR register. The delay is up to 1 bit of a communication clock cycle, generated within the SCI by the bit rate setting.
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