Joy-it Micro Controller

Teensy 4.0 provides support for dynamic clock scaling. Unlike other microcontrollers where changing the clock rate causes incorrect baud rates and other problems, Teensy 4.0 hardware and Teensyduino's software support for Arduino timing functions are designed to allow dynamic ...Teensy 4.0 provides support for dynamic clock scaling. Unlike other microcontrollers where changing the clock rate causes incorrect baud rates and other problems, 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 such as delay() and millis(), as well as Teensyduino extensions such as IntervalTimer and elapsedMillis, will still work correctly when the CPU changes speed. Teensy 4.0 also provides a power off function. By connecting a pushbutton to the On/Off pin, the 3.3V supply can be turned off completely by holding the pushbutton for 5 seconds and turned on again by a short button press.

When a coin cell battery is connected to VBAT, the Teensy 4.0's RTC will continue to keep track of the date and time even when the unit is turned off.