Getting started with the new ATtiny chips - Electronics-Lab.com
ATTINY814-SSNR Microchip Technology | Mouser Deutschland
A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
ATTINY814 | Microchip Technology
ATTINY814-SSNR | Microchip Tech | Microcontroller Units (MCUs/MPUs/SOCs) | JLCPCB