Questions tagged [reset]

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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How to generate an internal reset from available signals along with external reset in VHDL

I need too generate an internal reset for from the available signals in FPGA. Could anyone please tell me how do i generate this internal reset which should reset after 32 clock cycles. I am coding in ...
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AVRDUDE with Arduino won't reset with simple 2N2222 transistor circuit

I'm trying to use a transistor to make a simple reset circuit between a Raspberry Pi (3.3V) and Arduino Micro (5V.) I'm using the following simple circuit: 2N2222 (base) -> 390 ohm resistor -> ...
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67 views

MAX7221 always hangs on first power on

I have an issue quite similar to this one. The behavior of my MAX7221 is the following: when powering on the board the first time (let's from cold & dark) it turn on all the segments and does not ...
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53 views

JK Flip-Flop 0-9 up/down counter [closed]

I designed a 4-bit JK up/down counter. I want the circuit to be reset to 0 when counting up when it reaches 9, and to be reset to 9 when counting down when it reaches 0. Anyone know how ? I tried a ...
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85 views

Help wiring a pic processor to a FTD chip

I have been trying to wire a PIC18f4620 to a FTD1232 using the MLCR reset. Below is my circuit. When I hit the reset, the short causes the processor and the FTD to lose power and I am unable to ...
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91 views

SDC Constraint for reset synchronizer

I have a reset bridge in VHDL which is based on a multi-FF synchronizer chain as depicted below. This reset bridge is used in various instances throughout my design. I want to properly constrain the ...
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91 views

Arduino spuriously resets with power draw

I have a simple circuit, pictured below, that uses an Arduino to control two large bidirectional motors via 12V relays. Normally this works a treat, but sometimes the Arduino ends up resetting itself. ...
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4answers
142 views

Why is NMI commonly pulled high on many ARM SoC schematics?

I've noticed that "AP-NMI" is pulled high on several ARM SoC schematics, and it is pulled high by the real-time clock (RTC) voltage, which is an always-on power domain (battery backup). Why ...
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155 views

Arduino UNO-CH341 keeps resetting randomly

A brief summary: I work at a small workshop/factory, and we've got a single three-phase compressor for the whole factory, a week ago the compressor controller flat-out died and that left the entire ...
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How do I build and simulate a T Flip-Flop without a reset in SystemVerilog?

The problem I'm facing is closely related to this: https://electronics.stackexchange.com/a/540545/238188 . I found I could not simulate a T Flip-Flop without a reset on Multisim Live. I found that I ...
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69 views

Is it ok to connect a CMOS logic output to a power-on-reset circuit like this?

I am trying to make a power-on reset circuit that can also be manually reset. The reset is active-low. When the capacitor is charging, I'm assuming 5v will be present on pin 10. Would this damage the ...
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262 views

JK Flip-Flop Counter: How to reset a counter?

I currently have a 3-bit asyncronous counter (built using J-K flip flops) that continuously counts up. However, I am struggling to figure out how to reset the counter to 0 when an input (Reset) is ...
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55 views

74HC73 reset on released button

I want to use one button for set and reset. With a hex-inverter (because of falling edge), when I press the button, set works fine, but I need another button to reset the 74HC73. Is there some ...
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130 views

posedge clk vs posedge clk, posedge reset

I'm looking for the difference between: always_ff @(posedge clk) begin and: always_ff @(posedge clk, posedge rst) begin Here's ...
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How to Reset ESP8266-01 with a proximity sensor

I really would appreciate your help. I'm trying to build an external circuit to reset my esp8266-01 when my proximity sensor is triggered. Why am i doing this ? When the ESP wake up from deep sleep (...
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80 views

Could power cycling a modem 24 times a day for over 3 years (>30,000 times) cause the modem to lose its settings? [closed]

Could power cycling a modem 24 times a day with it being on for 10mins at a time for over 3 years (>30,000 times) cause the modem to lose its setting and revert to factory? This modem.
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34 views

In SR latch when apply a pulse to reset latch how the Q is changed?

Here is the initial state of SR latch both reset and set inputs are zero. Here we apply a pulse to the reset input and it shows it changes in this way first - and then - The thing that I don't ...
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Unable to use push button reset in IGLOO Nano FPGA

I have designed a FSM in verilog and I'm trying to realize it in IGLOO nano FPGA (shown in the Fig1. below). The interface verilog code of the FSM is given below: ...
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45 views

Controlling AVR reset via voltage divider

I have an AVR atmega32u4 which is being run on 3.3v. I program it using a avr usbisp, which runs at 5v.. The problem i'm having is driving the reset pin.. I currently have this schematic where ...
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Cold Reset STC125A60S2 PLC Board

I am working on these PLC Board: http://more-suns.com/product/html/?321.html but I cannot contact manufacturer. The fact is to have it programmed I have realized that I can only do it after a cold ...
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120 views

Thunderstorm reseting my micro-controller

I think this is a follow up from my previous question. If not then please ignore it. I have created a very basic (crude) alarm system that uses a reed switch. Luckily there was a thunderstorm and some ...
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255 views

Working of the “Capacitor Reset” block

I am reading this App Note. On page 6, Figure 5, they have provided a circuit which helps with the soft start and input protection circuitry. I am not able to understand the "Capacitor Reset&...
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Atmega328p-pu (arduino bootloader) processor freezes/resets randomly

I have updated the schematic of my project. The board for this was produced and all components are soldered to the board. Now I am trying to make a "n20 gear motor" move using the motor ...
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60 views

NRST Pin pull-up resistor on STM32F303RET6

The datasheet from the STM32F303RET6 shows that a pull-up resistor (a weak one?) is already included in the device itself. Rpu. But my knowledge tells me I have to add one myself in front of NRST, ...
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59 views

Noise that resets a device that I would like to avoid from chip reset pin

History/context: I talk about a 15Mhz noise when drill machine or any kind of machine activation in my network, before, at other post. By the moment neither RC, RL or RLC butterworth low pass filter ...
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65 views

Hold two microcontrollers in reset at turn-off with one DPDT power switch?

I want to use the second switch to ensure that two micros are both held in reset when the switch is off. They use different supplies and one sometimes also resets the other, so I want to use MOSFETs. ...
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52 views

How to use reset pin of ATmega64

I have an Avocent SwitchViewDVI (4SVDVI10) KVM that looks to be run by an ATmega64 microcontroller. Every now and then the KVM locks up and I need to reset the unit by pulling all USB power sources ...
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379 views

Synchronous reset in multi clock FPGA design

I want to start using sync reset inside my FPGA designs, and I'm new to Xilinx FPGA design. Normally I have 5-6 clocks in every design, and the reset is driven from the push button on the board. What ...
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81 views

How do I factory reset a ESP8266MOD

I have a ESP8266MOD, that I tried to flash over the air with mdash from mongoose os. I had originally done the following steps from this turotial https://mongoose-os.com/docs/mongoose-os/quickstart/...
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2answers
129 views

Why are most of the RESET signals in embedded systems active low?

I am hardware design engineer. I had seen lot of board designs since 2015. In my career I have seen that most of the RESET signals are of active low signals. Is there any logical reason behind that? ...
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130 views

Reset and trigger 555 timer with one push button

I want to turn on a LED with a single push button. When the button is pressed, the LED has to be turned on for an X amount of time. But what I also want, is to turn of the LED with the same push ...
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1answer
99 views

CD4043 latch breadboard VS PCB

I am working on a circuit that contains CD4043 R/S latch. The design on the breadboard works and everything is great, as soon as the PCB was manufactured and components were soldered, an issue with ...
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3answers
93 views

Discharge capacitor faster during reset

The part under consideration is UDA1334BTS - the DAC I use in my design. Here's the typical connection diagram: If the circuit is being powered off, and then quickly on, the Vref voltage does not get ...
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70 views

Why is does my board stop responding periodically when the motor is hooked up?

I have built a stand alone Arduino type board. It will run all day long as long as no actuator is hooked to the relays, the voltage on a voltmeter shows when the motor changes direction properly. ...
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156 views

STM32F103CBT7 dev_target_held_under_reset problem

I have a PCB with the STM32F103CBT7 microprocessor. I used the ST-Link V2 with the STM32CubeProgrammer to programm it which I think worked the first time as it connected and and ended programming ...
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3answers
58 views

Impact of a reset pin higher than VDD

The datasheet of a chip describes the circuitry of the reset pin the following way: The reset pin is described as a pull-down. The chip is powered at 1.8V - the recommended/acceptable values are ...
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1answer
135 views

Reset circuit of CP2102N and Atmega328P

I am working on a project where I want to programm the atmega via usb serial connection, just like an arduino. In order to do that, I have wired up both chips as the documentation suggests. The reset ...
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23 views

Restarting ESP8266 NodeMCU in DeepSleep with a signal from HM10 BLE

I'm building a simple project in which I put the ESP8266 NodeMCU board in DeepSleep mode, so I can save some battery since it's powered with 4 AA batteries. What's the problem? I don't want my ESP to ...
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185 views

Why does the voltage value on the RESET pin of my microprocessor not go high?

I am facing an issue that I do not understand. I am using a STM32F030K6T6 microcontroller with a capacitor X7R 0603 100nF 10% 50V connected to the ground, whose the value corresponds to the ...
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72 views

Raspberry Pi: How to connect global_en with gnd on a 5v signal?

On a Raspberry Pi 4, you can perform a hard reset by pulling the global_en pin to low. I want to control this reset by using an external 5v signal. When the signal is high, the reset is performed. I ...
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39 views

Limiting high input voltage on a CMOS input

I have a CMOS IC that has a low level RESET input. I would like to connect it to MCLR pin of my Microchip CPU but this is problematic because programmer/debugger (Microchip ICD) can put there a level, ...
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STM32F103 random reboots

we have made a 2 layer board for a STM32f103, and apparently it works fine but we get a random resets now and then. When that occurs there is a 1 in the Bit 27 PORRSTF: POR/PDR reset flag and Bit 26 ...
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75 views

Should I use an asynchronous or synchronous reset?

I am programming a Microsemi M2Gl005 FPGA and wondering which type of reset I should use. I currently have an asynchronous reset implemented, but I wanted to make sure that the part didn't prefer a ...
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1answer
211 views

Oscillating value of reset pin

I have a custom board STM32WB55CGU6 with a reset pin connected to a pull-up resistor and a capacitor as shown in the schematic and PCB layout below (connected to the reset pin 7): Using an ...
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3answers
160 views

Search for “pinhole” SMT switch (like “reset” switch operated with paperclip)

I search for a small switch, momentary on, SMT mounting type, I can put on my STM32 board for entering DFU. I search for a small switch with only a small hole to put a pin or a paperclip. I thing I ...
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Reason for x86 reset vector being at 0xFFFFFFF0 instead of 0xFFFFFFFF

The top answer to this question on Super User gave an explanation that was satisfactory to me at first as to why the reset vector is not at address 0 (afterwards , I realized that it doesn't why the ...
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1answer
103 views

Does not Reset Handler move along with NVIC vector table?

My board: STM32F407G-DISC1 (based on STM32F407VGT6 microcontroller) See reference manual. (pages around 371 are related) My understandings Each interrupt service routine is located in a memory address,...
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2answers
55 views

Brown-out detection with an external clock ATmega1280

I'm using ATmega1280 with an external clock and I have some questions about the "safe operating area" for preventing EEPROM corruption with BOD. The external clock is: Crystals 14.7456MHz ...
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1answer
58 views

Microcontroller Vol Maximum Voltage compatibility

I am having this microcontroller - S32K142 64 pins - 5V Core voltage I have the below RESET signal connection which is provided by the MCU to the below transistor (which provides RESET to another ...
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1answer
56 views

Continuous Reset generated by LDO to Microcontroller

I have the below schematic Datasheet of the LDO - L4995 -SSO24 package LDO Specification : Input Voltage : 12-16V Output Voltage : 5V Load Current : 100mA Issue : My LDO is generating RESET ...

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