Contents
Can a MCU talk to more than one UART?
Likewise, the process is duplicated when the MCU wants to talk to device 2. The above approach works well if all UART channels are operating in a master/ slave configuration—the peripheral device will only send data when requested by the MCU acting as the master. So, what if the system needs a combination of both master and slave devices?
Do you need multiple asynchronous channels for one UART?
In another scenario, your application may need multiple asynchronous channels with multiple slave channels. If available, take advantage of the MCU’s asynchronous channel’s handshaking capability with Data Terminal Ready (DTR)/Clear To Send (CTS) signals.
What kind of micro controller is used for UART?
U1 is the PIC24FJ64GA306 micro controller, I chose this chip because it has four UART peripherals and was the cheapest I could find by shopping around on Farnell and microchipdirect. The chip also features several 5V tolerant I/O pins meaning that even though the device will need to be powered at 3.3V it will work as is with 5V systems.
How does a UART talk to a peripheral device?
You can use the DTR/CTS signals to hold the asynchronous channel while the UART gets mapped back to the original pin. Where peripheral devices don’t have handshaking signals, another workaround can be applied.
When do you need a serial UART interface?
Even if the MCU is not talking to another serial device, you’ll need it at-least during the development work to speak to your computer. UART also come in handy for firmware upgrade and enabling/disabling product features during it’s lifetime.
Where to find universal asynchronous receive and transmit ( UART ) interface?
The Universal Asynchronous Receive and Transmit (UART) interface is found on a variety of peripheral devices. Consider, for instance, a microcontrollerbased system with four such peripherals. Ideally, in low-cost embedded applications, y
How does a UART talk to a device?
The control program will then dynamically map a UART in hardware to these four pin sets, based on the application’s need. For example, when the application must communicate with device 1, the program will map hardware UART to the RP1 and RP2 pins.