Your comments and suggestions are welcomed. Actioning the MCLR will be certainly more practical than unplugging the power cord. This function is TREMENDOUSLY useful when using a device that freezes because a bug in your code or if you use an always-on battery connected application or a device that has gone to ‘sleep' mode even a device that has to restart their duty. Other sources for resetting the microcontroller includes: brown-out reset (BOR), sleep interrupt, watchdog timer (WDT), etc. Consider this a useful feature for most cases. You may need to do this for debugging purposes, give an external control to the microcontroller or if the code freezes because of a bug (or error). Resetting the microcontroller will have the same benefits as starting over your computer or router: it gives a fresh start for the device. A diode in antiparallel to the resistor will help to quickly discharge the capacitor when the power source is turned off.Īnother recommendation, but far less used, is a resistor connected to the MCLR pin. If your microcontroller controls sensible circuitry, then the capacitor is a must. The resistor value shouldn't be higher that 40KΩ, but any value between 1KΩ and 10KΩ will be fine.Īdd a capacitor in parallel to the pushbutton to reduce bumping. Recommended Circuit Diagramįor most cases, a simple resistor and a push button in series will suffice (I really mean it).
You can identify active low input by the bar above the MCLR. This means that the pin will be activated when the voltage at that pin will be a zero or low in positive logic in English this means when the pin is between 0V and 0.8V.
Each time the MCLR is actioned, the microcontroller will stop wherever it was and it will start over again at the mentioned vector. When the device in turned on, the firmware starts at the RESET vector, at address 0x0000.
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