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AVR microcontrollers
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=== UPDI === The Unified Program and Debug Interface (UPDI) is a one-wire interface for external programming and on-chip debugging of newer ATtiny and ATmega devices. UPDI chips can be programmed by an Atmel-ICE, a PICkit 4, an Arduino (flashed with jtag2updi),<ref>{{Cite web|url=https://github.com/ElTangas/jtag2updi|title = GitHub - ElTangas/Jtag2updi: UPDI programmer software for Arduino (Targets Tiny AVR-0/1/2, Mega AVR-0 and AVR-DA/DB MCUs)|website = [[GitHub]]|date = 17 December 2021}}</ref> or though a UART (with a {{nowrap|1 kΞ©}} resistor between the TX and RX pins) controlled by Microchip's [[Python (programming language)|Python]] utility pymcuprog.<ref>{{cite web |title=pymcuprog - Python MCU programmer |url=https://github.com/microchip-pic-avr-tools/pymcuprog#serial-port-updi-pyupdi |website=Github |publisher=Microchip PIC&AVR Tools |access-date=18 November 2022 |date=13 November 2022}}</ref>
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