CanHobby presents the first in a line of development/break-out boards for the new MicroChip AVR128 series of 8-bit AVR microcontrollers. This board uses the AVR128DB28 which is the most capable of the MicroChip 8-bit MCUs available in a through-hole package. The board can be used like a "Nano" for recreation and development. The MCU is socketed to allow moving the MCU with finalized firmware to a production board or a breadboard for connection to external components.

The AVR128DB28 comes in a 28-pin DIP package exactly like the well known ATmega328P of "UNO" fame. It will run at 1.8-5.5V at all frequencies.

It features:

• 128 MBytes of flash memory, 16 KBytes of SRAM and 512 Bytes of EEPROM.

• 1 - 24MHz operation from an accurate on-board oscillator. It can easily be overclocked to 36MHz or even 48MHz using an external crystal.

• 21 GPIO pins are available, many of which offer software selectable 5V/3V3 operation on a per pin or per port basis.

Most of the GPIO pins also offer alternative peripheral function including but not limited to:

• 3 x UARTs
• 2 x SPI buses
• 2 x I2C
• 4 x 16-bit timers
• 1 x 12-bit timer
• 1 x Real-Time Counter (RTC)
• 9 x 12-bit differential ADCs
• 1 x 10-bit DAC plus many other features.. see the PDF

Please Note: the -C rev. 1.1 board has no layout errors - no jumpers required. the -F board has a PCB layout error. A jumper needs to be soldered in for proper operation of the Reset line and to allow uploading via serial.

I normally ship with the OptiBoot bootloader installed set for 24 MHz operation. If you would like no Bootloader or a different frequency, or other variation, just let me know.

If you need to be able to reload the bootloader I am working on a mod to my USB-UART for ESP to allow programming the UPDI interface on this board. In the meantime I could help you to jury rig a CP2102 or FTDI programmer - quite easy - just need 1 or 2 resistors and a diode..

The board is easily programmable via the Arduino IDE - Spencer Konde (Dr. Azzy) has written a fine boards package called DXcore. It installs via the IDE boards manager and works very well with IDE version 1.8.13 and above.

http://drazzy.com/package_drazzy.com_index.json

In addition this board offers a female header for connecting a CP2102 or FTDI USB-UART board. There are solder pads on the bottom to enable the 5 on-board LEDs - Power and GPIO 4 thru 8. The -C board allows selection of 5V or 3V3 operation. There is also the option to select Vcc2 for dual voltage domain operation.

The unassembled version includes the PCB, MCU, 28-pin socket, 6-pin female header for the USB-UART and the male header pins..