What is reset pin of microcontroller?
During a LVD reset, the RESET pin is held low, thus permitting the MCU to reset other devices. After the device is powered on the supply voltage starts increasing. when the supply voltage reaches around 1.1V, the internal pull-up on the RESET pin is enabled and the core is initial- ized.
How does a reset pin work?
When the processor is reset or powered on, it resets its registers and peripherals to a known good state. Reset Pin is used to connect the microcontroller to the reset circuitry . Generally reset pin takes active low inputs . Main purpose of reset pin is to monitor the power fluctuations supplied to microcontroller .
What causes a processor to run out of power?
Could be caused by any number of external problems, including a damaged regulator or a dip in the upstream supply. Make sure the power rails feeding the processor are stable. May require more cap somewhere, perhaps decoupling cap directly on the processor.
Can a voltage spike on a microcontroller cause reverse current?
Voltage/current spike on any of the microcontroller pins (worst is the oscillator) can cause reverse current and may switch internal register (same as voltage spikes on the supply line). In general, when interfacing to a kind of industrial environment caution needs to be applied (for more see: http://www.ichaus.biz/wp1_mcu_interface ).
What causes an invalid reset code on a computer?
Make sure there’s enough capacitance on the reset pin, possibly as much as 1 uF. ESD coupling into other pins of the processor. Scope probes in particular can act as antennae, couple noise into the chip and cause odd resets. I’ve heard reports of “invalid opcode” reset codes. Bad solder joint/intermittent bridge.
What makes the resets stop in EEPROM code?
Increasing the filter cap on that feedback rail made the resets stop. One could imagine that adding a dV/dt filter across the transistor might have had a similar effect. Watchdog timer. Make sure the watchdog timer is cleared often enough, especially in branches of your code that may take a long time to execute, like EEPROM writes.