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17 UART - Universal Asynchronous Receiver/
Transmitter
Quick Facts
What?
0 1 2 3
4
The UART is capable of high-speed
asynchronous serial communication.
Why?
Serial communication is frequently used in
DMA
controller
RAM
UART
RX
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
EFM32
TX
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.
17.1 Introduction
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.
17.2 Features
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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, 8-9 (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
2011-04-12 - d0001_Rev1.10
217
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