Joy-it Joy it Microcontroller TEENSY 4.0 Development Board

Teensy 4.0 offers support for dynamic clock scaling. Unlike other microcontrollers, where changing the clock frequency can cause incorrect baud rates and other issues, the Teensy 4.0 hardware and Teensyduino's software support for Arduino timing functions are designed to allow dynamic speed changes. Serial baud rates, audio streaming sample rates, and Arduino functions like delay() and millis(), as well as Teensyduino extensions like IntervalTimer and elapsedMillis, continue to work correctly even when the CPU changes speed. Teensy 4.0 also features a power-off function. By connecting a push button to the On/Off pin, the 3.3V supply can be completely turned off by holding the button for 5 seconds and turned back on with a short press. If a coin cell is connected to VBAT, the RTC of the Teensy 4.0 will continue to keep track of the date and time even when the device is powered off.