platform-teensy-gcc10/boards/teensy2.json

{
  "build": {
    "core": "teensy",
    "extra_flags": "-DARDUINO_ARCH_AVR -DARDUINO_TEENSY2",
    "f_cpu": "16000000L",
    "mcu": "atmega32u4"
  },
  "frameworks": [
    "arduino"
  ],
  "name": "Teensy 2.0",
  "upload": {
    "maximum_ram_size": 2560,
    "maximum_size": 32256,
    "protocol": "teensy-gui",
    "protocols": [
      "teensy-cli",
      "teensy-gui"
    ]
  },
  "url": "https://www.pjrc.com/store/teensy.html",
  "vendor": "Teensy"
}