LEUART - Low Energy Universal Asynchronous Receiver Transmitter

Quick Facts

What?

The LEUART™ is available in Energy Mode 0 to Energy Mode 2 and provides full UART communication using a low frequency 32 kHz clock. The Low Energy UART has special features for communication without CPU intervention.

Why?

allows UART communication can be performed in low energy modes, using only a few µA during active communication and sub-µA when waiting for incoming data.

How?

A low frequency clock signal allows communication with less energy. Using DMA, the LEUART can transmit and receive data with minimal Cortex-M3 CPU intervention. Special UART frames can be configured help control the data flow, further automating data transmission.

Features

The unique LEUART, Low Energy UART, is a UART that allows two-way UART communications on a strict power budget. Only a 32.768 kHz clock is needed to allow UART communication up to 9600 baud/s. The LEUART includes all necessary hardware support to make asynchronous serial communication possible with a minimum of software intervention and energy consumption.

• Low energy asynchronous serial communications
• Full/Half duplex asynchronous UART communication
• Separate TX/RX enable and double buffered transmit buffer and receive buffer
• Programmable baud rate, generated as a fractional division of the 32.768 kHz clock
• Configurable number of data- and stop bits
• Capable of sleep-mode wakeup on received frame
• Supports transmission and reception in EM0, EM1 and EM2
• IrDA modulator (pulse generator, pulse extender)
• Multi-processor mode
• Loopback modes