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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32 views

Step Generator Reset Circuit Alternatives

I'm working (slowly) on a project to build a curve tracer based largely on the Heathkit original (Heathkit Catelogue - IT-1121) and I've come up against an issue in the step generating circuit. The ...
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1answer
72 views

PIC reset on power off

Attached is the block diagram of my circuit. Input is 230 VAC. A SMPS module converts it to 14 VDC. The on board regulator then converts it further to 3.3 V. I have observed that many times when I ...
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2answers
59 views

555 timer bistable circuit problem: default flip-flop state is 'ON' on power reset

The following circuit is a controller for a water pump. It turns the pump on when the reservoir water level drops below the 'L' probe and turns it off when the level reaches the 'H' probe. This ...
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3answers
128 views

Is power cycle reset different from reset pin reset?

I am using custom built arduino uno for a home automation project. Sometimes, the arduino locks up due to electrical noise or sparks in the ac lines. More details here. I tried conducting some ...
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1answer
108 views

How do you restart the MSP430 Launchpad programmatically with Energia?

Can anybody tell me what Energia method I can call to programatically reset the MSP430 Launchpad. Under certain circumstances, I need it to power down and back up again. It needs to shut down power ...
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1answer
35 views

D flip-flop using basic gates + Clear

I'm using Logisim to make basic circuits and they have in-built things such as Counter and D Flip-Flop. The D Flip-Flop looks like this: It however doesn't show how it's made up of the basic gates (...
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1answer
22 views

PIC24 Reset Issue

I am working with the PIC24FV16KM202. I am encountering resets while implementing Dispatch, which is a serial protocol that I'm working on that grew out of a project. The example that I'm working on ...
0
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1answer
154 views

Best way to control power with MCU gpio pin

This is my circuit. An MCU gpio pin should control the power of another IC. Because the component requires more current than the gpio pin can drive, an N-Channel MOSFET is used. This is IC has no ...
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1answer
123 views

Digital Logic Reset [closed]

Question Too broad apparently.
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2answers
292 views

Do I need to reset my FPGA design after startup?

I usually initialize state registers of my FSMs by specifying an initial value in my VHDL code, so that, I do not require a reset pulse after startup of the configured FPGA. The following example ...
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votes
3answers
113 views

Designing a factory reset switch

I want to add a factory reset onto a PCB design I am working on. Basically, I want it to be a switch (or combination of) that will never be "accidentally" closed and therefore accidentally factory ...
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3answers
508 views

How to protect Reset pin of MCU from ESD strikes?

We have been designing ESD protection circuits for MCU exposed pins. Here comes the reset pin protection: The pin is connected with a ESD suppressor at the connector. The pin is connected in serial ...
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votes
2answers
1k views

Should all traps always be defined?

I've seen two cases now with dsPIC 30F4013 where the controller was resetting due to an undefined trap. Why these traps were getting raised in the first place is still a mystery, but that's not my ...
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3answers
153 views

Purpose of capacitor for MCU reset pin

I know why we need a pull-up resistor on the reset lines, but what is the reason for a capacitor parallel to the reset button? I saw it on Texas Instrument's schematic for MSP430F5529 launchpad.
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2answers
111 views

Would a reset IC be enough for many power supplies?

Could you please let me know how many reset ICs I'd need for my board? I'm designing a camera using the IMX225LQR Image Sensor. This sensor requires 3 different input voltages: 1.2v, 1.8v and 3.3v ...
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vote
1answer
53 views

SD Card Reset Issue

I've got an issue where I'm playing around with the SPI commands to get SD card comms working but it seems that if I send something the card doesn't like I get in a condition where it can't reset. ...
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1answer
486 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 AT+...
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2answers
100 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 ...
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2answers
139 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 1)...
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2answers
81 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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votes
1answer
259 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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1answer
40 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
votes
2answers
323 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 FPGA....
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1answer
65 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
99 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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votes
2answers
502 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
142 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 http://microchip.wikidot.com/...
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3answers
71 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 ...
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1answer
144 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: http://...
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2answers
140 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
63 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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votes
3answers
86 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 ...
1
vote
1answer
291 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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2answers
199 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
211 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 ...
1
vote
3answers
85 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 ...
1
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2answers
145 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
820 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 ...
1
vote
1answer
200 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
votes
1answer
135 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 pull-...
3
votes
1answer
482 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, ...
15
votes
5answers
2k 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
votes
2answers
192 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
votes
1answer
43 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 ...
1
vote
2answers
116 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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votes
2answers
86 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
votes
1answer
131 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 ...
0
votes
1answer
832 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 ...
0
votes
2answers
111 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 wire,...
0
votes
0answers
136 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: ...