EFM32WG Datasheet, PDF (491/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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18 UART - Universal Asynchronous Receiver/
Transmitter
0123 4
DMA
controller
RAM
EFM3 2
UART
RX
TX
18.1 Introduction
What?
Quick Facts
The UART is capable of high-speed
asynchronous serial communication.
Why?
Serial communication is frequently used in
embedded systems and the UART allows
efficient communication with a wide range of
external devices.
How?
The UART has a wide selection of operating
modes, frame formats and baud rates. The
multi-processor mode allows the UART
to remain idle when not addressed. Triple
buffering and DMA support makes high data-
rates possible with minimal CPU intervention
and it is possible to transmit and receive large
frames while the MCU remains in EM1.
The Universal Asynchronous serial Receiver and Transmitter (UART) is a very flexible serial I/O module.
It supports full- and half-duplex asynchronous UART communication.
18.2 Features
• Full duplex and half duplex
• Separate TX / RX enable
• Separate receive / transmit 2-level buffers, with additional separate shift registers
• Programmable baud rate, generated as an fractional division from the peripheral clock (HFPERCLK)
• Max bit-rate
• UART standard mode, peripheral clock rate / 16
• UART FAST mode, peripheral clock rate / 8
• Asynchronous mode supports
• Majority vote baud-reception
• False start-bit detection
• Break generation/detection
• Multi-processor mode
• Configurable number of data bits, 4-16 (plus the parity bit, if enabled)
• HW parity bit generation and check
• Configurable number of stop bits in asynchronous mode: 0.5, 1, 1.5, 2
• HW collision detection
• Multi-processor mode
• Separate interrupt vectors for receive and transmit interrupts
• Loopback mode
• Half duplex communication
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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