MCLR Abbreviation

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Popular abbreviations of MCLR:

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What does MCLR mean?

The full form of MCLR is Master Clear. It is possible to reset the entire device using the Master Clear, often known as the MCLR, capability included in many microcontrollers. This implies that if the MCLR is activated, the device will restart without the need to remove or detach from the power supply.

Functioning of MCLR

Because of its high pull-low resistance and ability to maintain the device in reset mode, the MCLR pin is often used to retain devices in reset mode. The resistor must be connected to Vdd in order for the circuit to function normally during operation.

For devices that are often driven low by brief signals, it is possible to put a tiny capacitor across their MCLR pin and into the ground to prolong their stay in reset mode. Additionally, a typically open momentary switch from MCLR to ground can provide a manual reset method for the device.

The MCLR is a low-level input that is always on and always active. The pin will be active if the voltage at that pin is zero or low in positive logic; in simple words, this implies that the pin’s voltage will be between 0V and 0.8V while the pin is in this range. The bar above the MCLR can indicate active-low input. PIN 4 is where you will find it.

Applications of MCLR 

• Resetting the microcontroller will provide the same benefits as restarting your computer or router: it will offer the device a clean slate to work from. In some cases, troubleshooting, providing external control to the microcontroller, or when the code freezes due to a defect may necessitate this action (or error). Take use of this functionality in the majority of situations.
• In addition to the brown-out reset (BOR), sleep interrupts the watchdog timer (WDT) and other sources.
• This method is invaluable when a device stalls due to a glitch in your code, an always-on battery-connected application, or a device that has gone into ‘sleep’ mode. Use the MCLR instead of disconnecting the power cable.