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Read a byte from the receive buffer. If the buffer is empty, 0 is returned. Writes the lower 14-bits of the UART's prescalar value that determines baud rate : If bit 7 = 1 :: bits 6:0 = upper 7-bits of the 14-bit prescalar value : If bit 7 = 0 :: bits 6:0 = lower 7-bits of the 14-bit prescalar value The UART's baud rate is determined by the prescalar according to this formula: : prescalar = Fsys / baudrate ; Fsys = system clock from {{NextRegNo|$11}} Eg: If the system is HDMI, nextreg 0x11 indicates that Fsys = 27000000. The prescalar for a baud rate of 115200 is 27000000 / 115200 = 234.
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