DIY ATmega4809 HV UPDI Programmer - Dlloydev/jtag2updi GitHub Wiki

Introduction

The firmware here supports using MCUs in the ATmega4809 Product Family as a HV UPDI programmer. This includes the ATmega4809, ATmega4808, ATmega3209, ATmega3208, ATmega1609, ATmega1608, ATmega809 and ATmega808 devices. Just use a breakout board or development board for the host MCU. If you use any 5V USB serial adapter or IC with an RTS or DTR signal, an auto reset circuit and use a bootloader option in megaTinyCore, you'll be able to use the HV programmer like a regular Arduino board to upload sketches to the target or update the programmer's firmware.

Pinout Diagrams

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Pinout Description

Pin Name Type Description
PA0 TX Output Serial communication to USB serial IC
PA1 RX Input Serial communication to USB serial IC
PA2 Power Switch Output Enable for power switch controlling target power cycle, active high
PA3 UPDI target Bidirectional Target UPDI programming
PA6 LED2/HVLED Output Used to indicate NVM version or UPDI enable 12V pulse
PA7 LED BUILTIN Output Active during programming and pulses upon release of reset
PC0 CPP/HV Enable Output Charge pump power, normally low, high during HV UPDI enable pulse
PC1 CP1 charge pump Output Charge pump Clock 1, 413kHz during UPDI enable
PC2 CP2 charge pump Output Charge pump Clock 2, 413kHz during UPDI enable
PC3 CPS charge pump Output Charge pump shutdown, normally high, low during UPDI enable pulse
PD0-PD5 VTG Output Provides target power and power cycle
PD6 VTG Input Senses target voltage for overload detection, 8-bit ADC
PD7 Mode Input Mode selection, 8-bit ADC
PF6 RESET Input Reset input, pullup enabled, active low

Schematic

No full schematic provided as you may want to create your own custom board or prototype. Refer to the schematics and datasheets provided with your chosen components. See the DIY ATtiny HV UPDI programmer page for additional circuit examples.

Firmware Installation:

  1. Install megaCoreX (follow their installation instructions)

  2. In Arduino "Tools", select the board settings as shown:

ATmega4809setup

  1. Connect a UPDI programmer to the Firmware Header and install the auto-reset capacitor.

  2. Run "Burn Bootloader"

  3. Get the HV Programmer Firmware

    ● Click on the green "Clone or download" button, then select "Download ZIP".

    ● Unzip this file in a folder on your PC, then open the sketch "jtag2.updi.ino" into the Arduino IDE.

    ● Select Sketch > Upload using Programmer, then disconnect the auto-reset capacitor.

You can now use the HV UPDI Programmer to "Burn Bootloader" or to "Upload using Programmer" to the target MCU using the serial port. Make sure to choose the appropriate board, chip and port setting for the target device.

ATmega4809 HV UPDI Programmer (Breadboard)

ATmega4809breadboard

1. Target Header
  • Pins top to bottom are UPDI target, GND, T5V (PORTD with power cycle)
  • Need to remove auto-reset capacitor.
2. Opto Isolator
3. Target Header
  • Pins left to right are UPDI target, 5V (USB), GND
  • Need to remove auto-reset capacitor.
4. 12V Charge Pump IC
5. LED Indicators
  • Top LED: LED_BUILTIN (Programing Activity and Target OVL Status)
  • Bottom LED: HV Pulse
6. UPDI target HV protection diode
  • Schottky (1N5817)
7. Firmware Header
  • Pins left to right are UPDI, 5V (USB), GND
  • Need to install auto-reset capacitor
8. Mode
  • Jumper 1-2 = PCHV mode (shown)
  • Jumper 2-3 = HV mode
  • Jumper removed = UPDI mode
9. Auto Reset Capacitor
10. CH340 Serial Module

Pins 1-5 (top to bottom) are:

  1. DTR
  2. RX
  3. TX
  4. 5V
  5. 3.3V
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