MC96FR116C
November, 2018 Rev.1.8
127
11.9 UART
11.9.1 Overview
The universal asynchronous serial receiver and transmitter (UART) is a highly flexible serial
communication device. The main features are listed below.
- Full Duplex Operation (Independent Serial Receive and Transmit Registers)
- Baud Rate Generator
- Supports Serial Frames with 5, 6, 7, 8, or 9 Data Bits and 1 or 2 Stop Bits
- Odd or Even Parity Generation and Parity Check Supported by Hardware
- Data Overrun Detection
- Framing Error Detection
- Three Separate Interrupts on TX Complete, TX Data Register Empty and RX Complete
UART has baud rate generator, transmitter and receiver. The baud rate generator for asynchronous
operation. The Transmitter consists of a single write buffer, a serial shift register, parity generator and
control logic for handling different serial frame formats.
The write buffer allows continuous transfer of
data without any delay between frames. The receiver is the most complex part of the UART module
due to its clock and data recovery units. The recovery unit is used for asynchronous data reception. In
addition to the recovery unit, the receiver includes a parity checker, a shift register, a two-level receive
FIFO(UDATA) and control logic. The receiver supports the same frame formats as the transmitter and
can detect frame error, data overrun and parity errors.
