Section number Title Page39.3.2 Transmitter functional description...............................................................................................................73839.3.3 Receiver functional description...................................................................................................................74039.3.4 Additional UART functions.........................................................................................................................74339.3.5 Interrupts and status flags............................................................................................................................745Chapter 40Universal Asynchronous Receiver/Transmitter (UART1 and UART2)40.1 Introduction...................................................................................................................................................................74740.1.1 Features........................................................................................................................................................74740.1.2 Modes of operation......................................................................................................................................74740.1.3 Block diagram..............................................................................................................................................74840.2 Register definition.........................................................................................................................................................75040.2.1 UART Baud Rate Register: High (UARTx_BDH)......................................................................................75140.2.2 UART Baud Rate Register: Low (UARTx_BDL).......................................................................................75140.2.3 UART Control Register 1 (UARTx_C1).....................................................................................................75240.2.4 UART Control Register 2 (UARTx_C2).....................................................................................................75340.2.5 UART Status Register 1 (UARTx_S1)........................................................................................................75540.2.6 UART Status Register 2 (UARTx_S2)........................................................................................................75640.2.7 UART Control Register 3 (UARTx_C3).....................................................................................................75840.2.8 UART Data Register (UARTx_D)...............................................................................................................76040.2.9 UART Control Register 4 (UARTx_C4).....................................................................................................76040.3 Functional description...................................................................................................................................................76140.3.1 Baud rate generation....................................................................................................................................76140.3.2 Transmitter functional description...............................................................................................................76240.3.3 Receiver functional description...................................................................................................................76440.3.4 Interrupts and status flags............................................................................................................................76740.3.5 DMA Operation...........................................................................................................................................768KL25 Sub-Family Reference Manual, Rev. 3, September 201230 Freescale Semiconductor, Inc.
