ATTiny212/214/412/416 Parts - added to compiler with demo programs.

[Anobium]

Added AVRDX tinyAVR® 1-series parts as follows:

ATtiny212
ATtiny214
ATtiny412
ATtiny414
ATtiny416

These are AVRDX parts and therefore you will require the latest GCSTUDIO build. You may need to sort the libraries but the core compiler works for these AVRDX parts.

The XNANO board I used required the UPDI programming method. This is part of the GCSTUDIO installation ( since 2021 ) but you will to ensure you have the latest USE.INI or add an entry into your own USE.INI as follows, and, select ATMEL mEDBG using UPDI as the programmer.

[tool = atprogram2]
desc = ATMEL mEDBG using UPDI
type = programmer
useif = 
progconfig = 
command = %atmelATPROGRAMdir%\ATprogram.exe
params = -t mEDBG -i UPDI -d AT%ChipModel%  chiperase program  -f "%FileName%"
workingdir = %atmelATPROGRAMdir%\

For demonstration programs see GitHub https://github.com/GreatCowBASIC/Demonstration_Sources/tree/main/TestSolutions/AVRDX_implementation/tiny416

Enjoy these new chips.

[Derek]

Thanks Anobium. You have worked hard in supporting these microcontrollers.

I see you programmed these AVR series 0 microcontrollers (that require UPDI programming) using the XNANO board.

I'm asking for suggestions to locate a programmer to program both series 0 & series 1 AVR chips in boards that do not contain a USB connector? ie only a programming pin header is loaded onto the board. I see the Pickit5 is one option. Emulation is not a hard requirement.

To remain flexible, the programmer should support the high-voltage pulse on the UPDI pin to enable programming if the pin has previously been configured as a GPIO or RESET pin.

[HackInBlack]

only PICKit4 or 5 are microchip High-voltage UPDI capable programmers acording to this:-
https://developerhelp.microchip.com/xwiki/bin/view/software-tools/programmers-and-debuggers/avr-updi-info/ (slightly out of date!)
pinouts here:-

[Anobium]

I am not sure, I can ask Stuart Bury to look into this and then he can design and build one.

Are we certain that none of the existing Programmers like USBTiny will not meet this specification?

[Anobium]

My research.

🔧 UPDI Programmers with 12V Support

I am avoiding Microchip's programmers, so to program AVR Series 0 & 1 chips via UPDI—including recovery when the UPDI pin has been reassigned (GPIO/RESET)—these are some options:

1. Kanda AVR UPDI Programmer

• PC-based tool supporting UPDI, ISP, TPI, and JTAG.
• Built-in 12V pulse generator—no need for extra circuits.
• Suitable for recovering disabled UPDI pins.

2. LeoNerd’s UPDI Programmer (Tindie)

• USB programmer built on the CP2105 chip.
• Manual switch for 12V pulse injection.
• Dual UARTs—great if you need serial debug alongside programming.
• Works well with ATtiny/ATmega Series 0 & 1.

3. jtag2updi (DIY Arduino Programmer)

• Use an Arduino Nano or Uno.
• Does not support 12V by default, but can be modified with a MOSFET/zener setup to handle it.
• Ideal if you are comfortable with a bit of soldering and scripting.

✅ Bonus: XNANO Board Reference

Already using the XNANO board?

It can be adapted to handle UPDI cases with a high-voltage pulse circuit (MOSFET + zener or 555-based).
Details here → ATtiny416 Xplained Nano – Microchip

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⚡ 12V Pulse Injector for UPDI Recovery

Use this circuit to apply a brief 12V pulse to the UPDI pin when it has been reconfigured as GPIO or RESET. It is ideal for unlocking AVR Series 0/1 devices before programming.

🧰 Components

• 1 × N-channel MOSFET (e.g. 2N7000 or IRLZ44N)
• 1 × 12V Zener diode (1W)
• 1 × 10kΩ resistor (pull-down for gate)
• 1 × 100nF capacitor (optional – pulse shaping)
• 1 × Trigger (manual pushbutton or GPIO pin)
• 1 × 12V power supply (DC-DC converter or charge pump)

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🔗 Basic Schematic

                +12V
                  |
               [Zener Diode]
                  |
UPDI Line o-------+--------+--------> To Programmer
                           |
                        [Drain]
                       [MOSFET]
                        [Source]
                           |
                          GND

Gate: Connected to GPIO or button, pulled low with 10kΩ resistor

📷 Diagram reference: See the schematic and discussion on the Arduino Forum – UPDI Enable Sequence by 12V Programming.

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💡 Usage Notes

• Pulse duration: 100µs to 1ms is typically sufficient.
• Trigger can be manual (pushbutton) or automated (GPIO).
• After the pulse, the UPDI line returns to normal and programming can proceed.
• Can be added inline with jtag2updi or XNANO setups.