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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Preventing inadvertent feeding of an external watchdog

Most internal watchdog timers found on microcontrollers contain mechanisms to prevent an inadvertent feed, usually requiring the write of a specific key-value to the feed register, although some ...
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2answers
2k views

Ripple counter, reset problem (J-K flip flop counter)

I am trying to simulate a decade counter using a ripple counter 4 bits and a NAND gate to reset the 4 J-K flip-flops when it reaches 10 (1010). The thing is it does not reset but goes to 4 (0100) due ...
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3answers
76 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
68 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
75 views

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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99 views

STM32F103 timer behaves differently after hardware reset instead of st-flash reset

I'm learning to program the STM32F103C8 Cortex-M3 (on a BluePill board) and was playing around with the general purpose timers (TIM2 to TIM5) because I wanted to time some routines. In my simple ...
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3answers
164 views

Arduino nano resetting after solenoid valve fires

I'm trying to control small, plastic 12V solenoid valves with an Arduino nano. I have an Arduino nano hooked up to a Sainsmart 4-Channel 5V Relay Module, and finally connected to the solenoid valves, ...
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1answer
68 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
70 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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2answers
74 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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0answers
29 views

One-way JK flip-flop using 74xx109

I want to design a flip flop circuit that effectively has one input and one output, as well as a reset trigger, along with clock and power, using a 74ACT109 JK flip flop. Basically, the output and ...
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0answers
44 views

Board is getting reset when I lower the temperature in Thermal Chamber

I have a board which I put in the thermal chamber. I increase the temperature inside the thermal chamber to 85degC. Soak it for 2 hours and note some readings. Then, when I change the temperature to ...
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0answers
109 views

esp8266 reset - power consumption

I am working on project with esp8266 UC powered with 3.7v lithium ion battery, where the reset pin is pulled low to keep it OFF. I would like to know if my battery were to be consumed with this ...
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1answer
79 views

circuit that disconnects a connection

I'm designing a circuit that will disconnect a connection when 5 consecutive square wave pulses are missing. If less than 5 consecutive pulses are missing then I want to reset the counting process. <...
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2answers
171 views

What is a dc reset?

I read this sentence from a book: "MR is a dc reset". It said about master reset leg in a counter IC. I have been searching but found nothing related to this terminology. I wonder what a dc reset is?...
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0answers
96 views

Can I use JTAG Boundary Scan if SRST is not available

I am attempting to integrate JTAG Boundary Scan onto an existing ARM9 board using SAM-ICE as the JTAG Emulator. One unfortunate oversight is that CPU/System Reset (...
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0answers
639 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
77 views

Stellaris Launchpad: Register to store value that can be read after soft-reset

I am working with an LM4F120 Stellaris Launchpad. In my firmware I want to trigger a soft-reset but only once. When the firmware gets out of reset it should read from a register to see wheterh the sot-...
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1answer
40 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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0answers
46 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
57 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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0answers
21 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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0answers
66 views

STM32F4 read protection cause MCU hang

I've faced a problem using read protection on STM32F412. When read protection enabled from Level 0 to Level 1 MCU hangs and does not recover after the reset with reset the pin, only after a power ...
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0answers
59 views

Handling of reset with multi bit clock domain crossing

I have an SoC design with two clock domains, each with it's own asynchronous reset (which roughly means asynchronous assertion of reset and synchronous de-assertion). I am trying to pass a 64 bit ...
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0answers
26 views

AT91SAM7S512 Oscillator, GPIO, & Reset questions

I just need some clarification of my circuit Oscillator: So for my circuit I want to be able to program it via USB, the datasheet gets a bit confusing to me tho. If I read the datasheet correctly I ...
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1answer
84 views

STM32F072C8T7 needs hardware reset upon power on to work!

When the device is connected to the ST_LINK, after firmware upload, it works perfectly fine. When I remove the ST_Link and then turn OFF and ON my device, it does not work, unless I initiate a hard ...
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114 views

What is the proper way to reset attiny85?

I have 3 attiny85 on my pcb. And I want to have software controlled reset for them. A separate STM32F0 microcontroller is responsible for the reset. I have two states from the STM32F0 to pull up and ...
0
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1answer
181 views

Atmega328pb microncontroller hangs

I've been working on a project with Atmega328PB microcontroller using both the UARTs for communication. The controller runs fine for a long time but all of a sudden it does not respond at all. It ...
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0answers
82 views

Cortex SWD pins disabled

I am trying to flash an Ambiq Apollo via SWD. The problem is that my debugger is unable to connect to the board. Initially, i though that the SWD pins would simply be remapped by software on the MCU....
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188 views

Microcontroller resets with motor driver (L293D)

I am making a simple robot with 2 BO motors driven by L293D on ATmega328P (took out from Arduino Uno). The robot when tested on Uno works fine. But when I put it on the board that I have designed (as ...
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0answers
64 views

Cannot read from RAM in Vhdl

Hi for some image processing purposes, I must read 12-bit color data of a pixel from Ram and display it on screen through VGA cable. However, my code does not read from Ram and all I see on the ...
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287 views

Holding Reset State Low longer with hardware 555 Timer

I have a 555 one shot timer circuit in which the Trigger and Reset pins are tied together in attempt to reset the timer every time the timer is triggered so that the one shot really extends for the ...
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3answers
516 views

4024 cmos counter not resetting

In my project, this section is faulty. I'm doing a bit-banging operation with shift registers and I'm trying to make shift register data reset after 15 bits are shifted out from the micro controller. ...
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0answers
305 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: ...
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1answer
1k views

How to reset an integrator ONLY with RLC and op-amps?

I am trying to reset an integration circuit that is designed like above -- but obviously with another resistor attached to the op-amp positive input side as well. I have used 4.7k\$\Omega\$ resistors ...
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1answer
222 views

Unable to turn off / reset SRAM 23LC1024

I'm trying to reset an external SRAM 23LC1024 (turn it off and turn it on again) which connected to my Arduino Mega 2560. I need to do that because I want to profile the SRAM in an attempt to ...