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The UART receiver functional block diagram is shown in Fig. 10-5. The heart of the receiver is the receive shift register UxRSR where a serial sequence is converted to a parallel word (9-bit word). After sampling the UxRX pin for the STOP bit, the received data in UxRSR are transferred to the receive FIFO buffer, if it is empty.
Fig. 10-5 UART receiver functional block diagram.
program Uart_Test dim text, delimiter as string dim test as word main: Uart1_Init(9600) 'Initialization of UART module on 9600Kbps delimiter = "stop" 'Delimiter is word "stop" while TRUE if Uart1_Data_Ready() = 1 then 'If data are received Uart1_Read_Text(text, delimiter) 'Only if STOP is received Uart1_Write_Text(text) 'Message is returned (echo) end if wend end.