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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Small RP2040 Reset Circuit

I'm working on designing a very small (approximately 1 sq inch) dev board based on the RP2040. I plan on including a small momentary pushbutton (or at least a header that can be easily bridged) to ...
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AVR's reset button has to be pressed *sometimes* for it to work

I am working on an ATmega328p on a breadboard setup which I have and use for all microcontrollers projects I work on. I am doing nothing but outputting a PWM signal on an LED. The PWM is fine, but the ...
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59 views

AVR reset pin capacitor causes chip to enter bootloader on powerup

I have a circuit using an ATmega32U4 and am using the Arduino Leonardo/Micro Caterina bootloader (the one that comes with arduinoIDE v1.8.13). The problem I am having is on power-up (via USB ...
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56 views

Understanding SAR ADC Control Logic

I am trying to understand how SAR control logic works before I use it in a design. I have read a few papers that design SAR ADCs but they don't go into detail on the control logic; they only show the ...
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2answers
282 views

Single chip power good IC?

It seems like there should be a million chips for this, but for the life of me can't find any. I'm looking for a small (SOT23 or similar size if possible) IC that provides an active high when the ...
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105 views

vhdl reset synchronizer [duplicate]

I have a question regarding reset synchronizing. If I have a reset_synchronizer.vhd file like this: ...
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3answers
75 views

How can a momentary switch be wired to only work after being held X seconds?

I have a few electronics projects in progress and would like to include a switch to reset by providing a short disconnect from power (be it from the wall or a battery) and on boot copy the original ...
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1answer
36 views

Reset when battery powered device receives USB power

Device (microcontroller) is powered by battery or USB, through load sharing circuit. When no USB, operates on battery. When USB applied, USB powered. I want device to reset once when USB power ...
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1answer
60 views

Serial DTR reset on custom Arduino-based board not working properly

I have a custom atMega328 board that's essentially an Arduino Nano with a few circuits doing some custom interfacing. Nothing super crazy. However I'm running into an issue with the RESET line, which ...
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218 views

Why is this power-on reset generator Verilog module getting optimized out?

I am trying to write a Verilog module that generates a power-on reset signal for a few clock cycles. I am synthesizing using Lattice iCEcube2 + Synplify Pro targeting an iCE40 HX1K on the Nandland Go ...
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62 views

What function does this resistor/capacitor arrangement provide in this reset circuitry

I have been trying to decipher what the arrangement of the resistor and capacitor does in the circuit below, but I am at a loss to explain it. Can someone explain to me what it is doing? The circuit ...
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114 views

The function setup () executes after ATmega328P wake up from the sleep mode

I am using ATmega328P in deep-sleep mode in Arduino IDE. For wake up I am using PCINT. I can see it is working but setup () also executes after wakeup. Is it ...
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TMS320F28375Dpzps JTAG Communication Problem?

At the moment I am trying to run the TMS320F28375Dpzps . I use Jtag as TMS320-XDS100v3_UM-336636 and the program Code Composer to communicate with the Micrcontroller. The JTAG (picture: JTAG) and the ...
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177 views

STM32F103C8T6 Bluepill - core held in reset error

"Core is held in reset" - the error stm32 st-link utility tool throws when I try to erase my STM32F1 blue chip. Is my board damaged or something? In Settings Window - Under STM32 Target ...
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70 views

HAL_Delay fails after flashing code

My code runs differently if reset vs. power-cycle. My board has a status LED. My program flashes an LED on and off. When I flash my code via my STLink V2 and hit my reset button, the light turns on, ...
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74 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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1answer
168 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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1answer
86 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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1answer
315 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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3answers
128 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
174 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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1answer
290 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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1answer
201 views

How do I build and simulate a T Flip-Flop without a reset in SystemVerilog?

I found that I could not get a T Flip-Flop without a reset to simulate in SystemVerilog, but I could get a JK Flip-Flop without a reset to simulate. This is because I can set a JK Flip-Flop to a known ...
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2answers
85 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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3answers
1k 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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1answer
61 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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4answers
567 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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37 views

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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1answer
82 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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1answer
55 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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1answer
61 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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34 views

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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1answer
121 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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3answers
269 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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54 views

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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1answer
101 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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1answer
79 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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1answer
85 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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1answer
78 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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4answers
609 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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1answer
166 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
152 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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1answer
241 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
129 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
118 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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0answers
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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0answers
258 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
60 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
210 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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0answers
24 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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