The reset line on a computer or other digital circuit places the circuit in a well defined initial state. Most microcontrollers have a built-in power-up reset to start the CPU executing code and may also have external resets and watchdog timers to help recover from unexpected events.

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41 views

Factory Reset a HM-10

I had programmed a HM-10 module to act as iBeacon with my Arduino Uno's serial monitor using the following steps: AT+RENEW Restores factory defaults AT+RESET Reboot HM-10 AT Wait for OK ...
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2answers
62 views

Resetting a microcontroller with a button connected to Vcc

I would like to have a way to reset my PIC by removing power from the chip. My hacker self thinks that the simplest way would be to add a resistor between the output of my LDO and Vcc on the PIC, and ...
1
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2answers
50 views

Cannot enter programming mode ATMega328p

I'm using an ATMega328p Xplained Mini development board. I was able to program it using Atmel Studio 7, being new to AVR programming I accidentally set the RSTDISBL fuse to 0 (has a default value of ...
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2answers
40 views

Should the reset pin on MCP23S17 go to a GPIO?

Most example schematics for Arduino, Raspberry Pi etc have the reset pin tied to GND. If number of GPIOs on the MCU wasn't a problem, would it be beneficial to have the reset of the expander ...
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0answers
34 views

MCP23017 with Raspberry Pi sometimes reset

I use MCP23017 with my Raspberry Pi and sometimes MCP23017 resets. MCP23017 is powered from Raspberry 5V and reset pin is also connected to 5V. MCP23017 is connected to 2 x 8-channel relays. Relays ...
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1answer
64 views

how to reset a memory array in verilog?

I have a memory like this: reg [7:0] memory [1023:0] How should I use a for-loop to reset the memory in verilog? Please give me the code. For example if ...
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0answers
53 views

What could explain a microcontroller reset when I suddenly feed a DC-DC converter?

We built a DC-DC Converter using a micro-controller to create and to set the frequency and duty cycle of the PWM signal. When we start supplying the converter from zero and increasing the voltage ...
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1answer
38 views

Minimizing mosfet interactions and overshoots. A case study

I'm back again with another headache of my own creation. It seems I'm constantly learning things the hard way. Straight to the point questions: I've noticed that my reverse voltage protection ...
3
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2answers
185 views

Reset the configuration of FPGA without reprogramming

I am doing an experiment on Xilinx VC709 board. The experiment involves removing and plugging in the DDR3 RAM while the FPGA is running. But every time I plug back the RAM I have to reprogram the ...
1
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1answer
58 views

Arduino PCB issue

I have made few different Arduino board which are programmable only via ISP because the Serial communication is giving me this error: Binary sketch size: 3,026 bytes (of a 30,720 byte maximum) ...
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0answers
74 views

Microcontroller on/off circuit in battery power device

I am using the below circuit to turn ON and OFF my load microcontroller circuit in my battery powered device. The max current draw I'm expecting is around 800mA. My logic is like this. For power up ...
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0answers
28 views

Software reset of NXP LPC2294 ARM7TDMI system from code

Is it possible to perform a software reset of the processor. ? My question closely resembles Is it possible to reset NXP LPC2100 microcontroller from code . However none of the possible answers in the ...
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2answers
385 views

BeagleBone Black reboots periodically

My BeagleBone Black reboots periodically after some random time (> 5hours)? I am totally stucked with ideas, I have my app working for that some random time and system gets reset. BBB works on Debian ...
2
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1answer
80 views

microchip pic18f: What is the difference between a POR/BOR and other resets

I found similar questions on the internet. some answered that all resets re-initialize the SFR. I don't know if this was tested or concluded. I'm so confused because at ...
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2answers
57 views

Inverting 3-to-8 decoder with all-active option

I have a requirement for an inverting 3-to-8 decoder circuit (i.e. all 8 output high except the selected one being low), but with an option to have all the outputs go low. The 74HC137 or 74HC138 is ...
0
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1answer
73 views

Latching push button with electronic reset [closed]

I'm looking for a latching push button switch that can be reset electronically. After much searching I managed to find this post: Resettable mechanical switch? which links to this switch: ...
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0answers
61 views

Reset a chip on any change of signal

Here is some background info on what I am trying to accomplish: When a cable(12V signal) is inserted, the chip should be reset (pulled low) for only 1 second, then return to 3V3. But when the cable ...
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2answers
125 views

Why does touching the capacitor in my buck regulator cause my micrcontroller to start executing code?

I have an AC powered microcontroller board. I use a CUI module (VSK-S15-48U) to generate 48V DC from the wall. That 48V gets bucked down to 3.3V to power a micro (atmega328-mmh) and some other ...
0
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1answer
46 views

PIC reset with PWM

I'm using a PIC18F4550 to control a DC motor with PWM. When I use a PWM of above 50% it works well, but when it starts to go below 50% the PIC resets. I have separated supplies for the PIC and the DC ...
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3answers
84 views

Manually triggering a low active pin

I have a microcontroller with an active low reset pin. This pin is connected to a timer that periodically triggers a low edge and resets the microcontroller. What would be the best circuit that would ...
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1answer
217 views

ATTiny45, LED strip, MOSFET, touch interface, but Vcc drops and tiny resets

I've developed a very little board with the ATTiny45 and mosfet (STD35NF06LT4 - http://www.farnell.com/datasheets/1689946.pdf ) to drive a high power LED strip at 24V. I have a 5V dc/dc converter ...
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0answers
88 views

How to reset AVR microcontroller?

I recently assembled my first custom PCB with an ATMega328 and ran into some problems. Is there an easy way to reset the chip to default settings including fuse bits so that I may start fresh? Any ...
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2answers
151 views

Periodically reset microcontroller

I have a tiny embedded system build around a Holtek HT48F06 microcontroller to monitor RFID tags (RDM630). Unfortunately it only detects the arrival, not the removal of a tag. As a workaround, I want ...
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1answer
139 views

RESET(bar) Pin of ATmega16

The datasheet says that an External Reset is generated by a low level on the RESET pin. And after reset all my conditions and values will be set to initial values. I have connected the Reset(bar) pin ...
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3answers
66 views

How do I get my Arduino to reset another board?

Let's say I have another micro controller board. It has a 2 pin header on it. If you momentarily connect those two pins together -- either shorting them out with a jumper cap, or hooking them up to a ...
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2answers
117 views

Soft Power reset by microcontroller

I want to design a circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down and then after a short period of time the power should ...
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2answers
459 views

Why does my DIY Barebones Arduino Due with SAM3x8E overheat on RESET press?

I made my own diy "bare bones" Arduino Due in an embedded application. Basically I was making a portable Bluetooth headphone amplifier for a school project. The point of the MCU was to display battery ...
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1answer
117 views

How to figure out reason for last reset on MSP430?

There are a number of possible causes for a microcontroller to reset itself, for example: brown-out or power-out watchdog timer reset initiated from software (to programmatically enter bootloader, ...
0
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1answer
87 views

How to make a negative flank to a negative pulse from normal state not connected?

I have a reset signal which should be triggered by a falling flank from 5V to 0 volt. This flank should generate a low pulse (5V -> 0V -> 5V). This can be done by just adding a capacitor and a ...
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votes
1answer
347 views

Micro controller reset due to noise, PCB design for noise immunity

After making this PCB, I learnt the importance of ground plane. Besides ground plane, there is considerable amount of theory behind PCB designing which can provide immunity against ESD, surge, EMI, ...
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4answers
1k views

Arduino resetting/hanging due to sparks in ac line

This is the PCB design of the project I have been working on recently (my first pcb design). The idea is to control ac appliances (fans, bulbs etc) without relays. I am using triacs which are ...
0
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2answers
120 views

How does the Roland TR-909 reset circuit work

I'm troubleshooting my Roland TR-909 drum machine, which doesn't power on anymore. All of the voltages come up fine, but the reset line stays low. My suspicion is one or more of the components of the ...
0
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1answer
38 views

Controller Seems to be going into Undefined Exception on Reset

We have developed a board around STR912FAW47 Micro-Controller. During initial testing we tried to bring up the board by loading a simple program for toggling an output port pin. We are using ULINK2 ...
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2answers
94 views

Reset IC Buffer manually

I have a buffer which I want to reset. The EN pin is connected to a pull upp resistor while the Reset pin is connected to pull down resistor. What should I do to reset the buffer manually? Should i ...
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2answers
73 views

Why is Reset Low True [duplicate]

What is the main reason that reset nets are low true? Is this so that any noise on the GND doesn't reset your system? If it was high true than couldn't you save the little leakage current that is ...
3
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1answer
103 views

PIC pin state change reset the PIC

I am trying to collect data from analog sensors (temperature and relative humidity) with a PIC microcontroller (PIC18F14K50). In order to save battery, the supply voltage of the sensors is turned ON ...
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1answer
592 views

Power on reset circuit for microcontrollers

In this schematic, there is a reset circuit with two pushbuttons: The button marked "warm reset" sends an active low signal to one microcontroller, while the button marked "cold reset" sends a ...
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2answers
96 views

Reset pin (15) behaviour of 4026 counter

I'm trying to play with CD4026BE counter and I'm unable to solve the problem with reset pin (15 according to datasheets and numerous examples). In my case, if pin 15 (reset) is grounded with the ...
0
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0answers
99 views

program resets after ISR for TIMER 2 on pic24F

I am trying to configure the timer2, but every time that an interrupt occurs, the microcontroller goes to the ISR and then starts the main() function again. This are the functions: ...
0
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2answers
418 views

ARM Cortex reset button and debug interface (SWD)

I am designing a circuit using the EFM32ZG222 MCU (an ARM Cortex M0+) and I need to use the SWD interface (with a 10-pin Cortex Debug Connector) along with a reset button. I found a schematic that ...
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1answer
308 views

Connecting Open-Drain inputs or outputs together with one resistor

I had a couple of quick questions. I am designing a board using 10 IO expanders which I'll use as inputs. Each has an !INT pin which is open drain and pulled high to 5v through a resistor. Can I ...
2
votes
3answers
241 views

Reset of a JK flip flop pulse indicator

I've made a circuit with 74HC109 JK flip flops. The purpose is to catch a pulse from two signals and for about 20 seconds keep the stored value (of which pulse came first). My problem is I need to ...
0
votes
1answer
160 views

reset microcontroller

i use dspic micro and ir2104 to drive half bridge mosfet i use 12 volt , 150 watt switching power supply and lm2576 3.3 for dspic. when the mosfet load is 10 watt no problem but when the load is 50 ...
4
votes
4answers
268 views

How often do AVR's actually glitch and need a watch-dog reset in the real-world?

Have you ever seen an otherwise happy AVR spontaneously glitch and require a reset? Assuming: a nice stead power supply that stays inside the specified range a correctly sized decoupling cap ...
2
votes
2answers
518 views

PIC18F44K22: Can't use MCLR/RE3 pin as input. MCU resets when RE3 is held down

I'm trying to use the 4-bit wide PORTE on a PIC18F44K22 MCU. This port contains the RE3/MCLR pin which can be configured as a reset pin or as an input pin by setting/clearing the MCLRE bit on ...
4
votes
2answers
371 views

ATTiny project resets when plugging in phone

Project I'm not very experienced with electronics and microcontroller-programming yet. I recently (accidentally) bought a couple of ATTiny13A microcontrollers, assuming I could program them using ...
2
votes
2answers
952 views

ATTiny85. How do I use the reset pin as an analog input or digital output?

According to this datasheet, the ATTiny85 has 6 I/O pins if we include the reset pin. I used five of them to charlieplex 18 LEDs and I need another one to use as analog input. Would it be possible to ...
2
votes
1answer
168 views

Reset I2C slave chip when master goes away

I have a board with a transformer and a MCP23017. This board is connected to another board via 4 wires which bring over power (+5V, GND) and I2C bus for an ATmega328P acting as the master. The ATmega ...
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votes
1answer
3k views

What is reset, preset and clear in a counter circuit?

I know this is a basic question. But I want to know the use of Reset, Preset and Clear in a Counter circuit. How do I use them? An example would be appreciated.
0
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1answer
135 views

Preventing Reset during ESD

I would like to design a RC filter to prevent reset to a SoC during a ESD strike. Assuming the reset net is by default low. And the reset comes from a separate board which connects to the main board ...