USB UART click

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  • MIKROE-1203
  • MIKROE-1203
USB UART click  offers a USB to asynchronous serial data (UART) interface, allowing the... more
Product information "USB UART click"

USB UART click offers a USB to asynchronous serial data (UART) interface, allowing the microcontroller based designs to communicate with the personal computer, in a very simple way. It is equipped with the FT232RL, a very popular USB to UART interface IC, used on many MikroElektronika devices - both for its reliability and simplicity. USB UART click is used for whenever there is a need for seamless and effortless interfacing of the UART lines to a personal computer. It can be used with any UART terminal, like the one found in MikroElektronika compilers. 

How does it work?

Like already mentioned, USB UART click carries the FT232RL, a USB to UART interface IC, from FTDI. The entire USB protocol is handled on the IC itself, thus no USB specific firmware programming is required. FTDI provides royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers for all the major OSes, used on personal computers. FT232RL also contains an integrated 1024 Bit internal EEPROM for storing USB VID, PID, serial number, product description strings and CBUS I/O configuration.

The Baud Rate Generator provides a 16x clock input to the UART Controller from the 48MHz reference clock. It consists of a 14-bit pre-scaler and 3 register bits which provide fine tuning of the baud rate - used to divide by a number plus a fraction. This determines the baud rate of the UART, which is programmable from 183 baud to 3 Mbaud. Also, non-standard baud rates are supported. The baud rate is automatically calculated by the FTDI driver, so it is enough to simply forward the desired baud rate to the driver, usually done by selecting the baud rate via the GUI interface of the PC terminal application.

After installing the OS drivers, the device is ready to be used. When plugged in, it will create a virtual COM port. After that, it can be used with the USART Terminal application, included in every mikroE compiler. It can be used for the data exchange between the MCU and the host computer. The USB UART click is equipped with the mini USB connector, allowing easy interfacing with the USB port of the host device.  More information about working with the UART communication, in general, can be found in the Learn article.

This device also features the configurable CBUS pins, which can be used for several different useful functions, as for example - configurable clock out for driving the microcontroller, data LED drive, USB Sleep, PWR status and so on. By default, CBUS3 and CBUS4 pins are configured as Power Enable and Sleep options and are routed to the PWM and CS pins of the mikroBUS™, respectively. More information about configuring the CBUS pins can be found in the FT232RL datasheet.

CBUS3 output pin (PWM pin of the mikroBUS™) will be set to a LOW logic state during the USB suspend mode It can be used to power down external circuitry or be used for similar purposes.

CBUS4 output pin (CS pin of the mikroBUS™) will be set to a LOW logic state after the device has been configured by the USB, then HIGH during the USB suspend mode. This can also be used for the powering down/power saving, by turning unneeded external circuitry.

This device also supports two additional signals - RTS (Request To Send) and CTS (Clear To Send), which can be used when the hardware flow control is required.

USB UART click also features a small low noise LDO, used to provide the logic voltage level reference. The input voltage for the LDO is taken from the USB or the mikroBUS™ 5V rail. The 3.3V rail from the LDO output is routed to the SMD jumper, labeled as the I/O LEVEL. It allows selection of the referent voltage for the logic section of the FT232RL, providing conditions to interface the USB UART click to both 3.3V and 5V MCUs.

The UART communication is indicated by two LEDs, red for TX (sending data in UART to USB direction) and yellow for RX (receiving data in USB to UART direction). These LEDs are used to provide a visual indication if there is any data transfer ongoing.


Type USB
Applications Board is used in RS232 communication with modems, printers, PC applications, and various devices that use UART communication protocol
On-board modules FT232RL USB-to-UART interface module
Key Features The FT232RL contains integrated 1024 bit EEPROM, 128 bytes long receive buffer, 256 bytes long transmit buffer
Key Benefits Configurable CBUS I/0 pins and entire USB protocol handled on the chip.
Input Voltage 3.3V or 5V
Compatibility mikroBUS
Click board size S (28.6 x 25.4 mm)

Pinout Diagram

This table shows how the pinout on USB UART click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
  NC 1 AN PWM 16 PWR Power enable / CBUS3
     Sleep / CBUS4 SLP 2 RST INT 15 RTS Request to send
Clear to send CTS 3 CS RX 14 TX Transmit
  NC 4 SCK TX 13 RX Receive
  NC 5 MISO SCL 12 NC  
  NC 6 MOSI SDA 11 NC  
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

USB UART 4 Click Electrical Specifications

Description Min Typ Max Unit
Logic voltage level 3.3   5.25 V
Operating temperature -40   85 °C

Onboard Settings And Indicators

Label Name Default Description
LD1 RX LED - Data Send (RX) status LED
LD2 TX LED - Data Receive (TX) status LED
LD3 PWR - Power LED indicator
JP1 I/O LEVEL Left Logic voltage level selection: left position 3.3V, right position 5V

Software Support

We provide an example for USB UART click inside all of our compilers. You can navigate to the demo using Project Explorer placed inside the folder named same as your development system.

Examples Description

Example application acts as a simple echo and each character is sent using the available terminal in all MikroElektronika compilers. Also, any other terminal of your choice can be used to write and read the messages.

char uard_rd;
void main()
UART1_Init(9600);               // Initialize UART module at 9600 bps
Delay_ms(100);                  // Wait for UART module to stabilize
while (1)
if (UART1_Data_Ready())
uart_rd = UART1_Read();     // read the received data,
UART1_Write(uart_rd);       // and send data via UART



 mikroBUS™ Standard specification 

 USB UART Click Examples 

 LibStock: mikroSDK 

 FT232R datasheet

 USB UART click schematic

 USB UART click: 2D and 3D files

 Click Boards™ Catalog

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