AVR16EB32 datasheet(14/46 Pages) MICROCHIP

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AVR16EB32 Curiosity Nano

On-Board Debugger

User Guide

DS50003605B - 14

Figure 3-2. CDC Connection

Debugger

CDC TX

CDC RX

Target MCU

USB

Terminal

So ware

Terminal

Send

Terminal

Receive

Target

Receive

Target

Send

UART RX

UART TX

USB

Info: The debugger’s CDC TX pin is connected to a UART RX pin on the target

for receiving characters from the host computer, as shown in the figure above.

Similarly, the debugger’s CDC RX pin is connected to a UART TX pin on the target

for transmitting characters to the host computer.

3.4.2

Operating System Support

On Windows® machines, the CDC will enumerate as

Curiosity Virtual COM Port and appear in the

Ports section of the Windows Device Manager. The COM port number can also be found there.

Info: On older Windows systems, the CDC requires a USB driver. The MPLAB X

IDE installation include this driver.

On Linux® machines, the CDC will enumerate and appear as /dev/ttyACM#.

Info: tty* devices belong to the “dialout” group in Linux, so it may be necessary to

become a member of that group to have permission to access the CDC.

On Mac® machines, the CDC will enumerate and appear as /dev/tty.usbmodem#. Depending on

the terminal program used, it will appear in the available list of modems as usbmodem#.

Info: For all operating systems, use a terminal emulator that supports DTR

signaling. See Signaling.

3.4.3

Limitations

Not all UART features are implemented in the on-board debugger CDC. The constraints are outlined

here:

• Baud rate: Must be in the range of 1200 bps to 500 kbps. Any baud rate outside this range will

be set to the closest limit without warning. Baud rate can be changed on-the-fly.

• Character format: Only 8-bit characters are supported.

• Parity: Can be odd, even, or none.

• Hardware flow control: Not supported.

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