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what happen if we give continues low voltage to reset pin ATMEGA32 will it spoil ?

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haroon_tech

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hi,

i am designing a development board , in that instead of switch(for reset) i used jumper/connector., so what we have to normally give is high to low pulse to reset(the controller) pin this is done if we used switch, but i am using jumper /connector ..
if we place the jumper/ connector in place of switch then it will ground for more time.what switch not....then it will give more low pulses to reset pin...
weather this means using jumper/connector in place of switch will harm to ic ...or not?
 

Most likely not, as long as there is a 30kΩ to 60kΩ pull up resister in place. The pin will be pulled low for greater that the minimum time require, therefore Reset should be successful.

BigDog
 

any thing you may use no harm to microcontroller
 

Nothing will happen. The microcontroller will stay in "reset" and will not carry out any function. Since the ATMEGA32 has an internal pull-up on the Reset pin, no harm will be done. According to the datasheet, R(Rst) - the reset pin pull-up resistor has a value that lies between 30kΩ and 60kΩ.

Most likely not, as long as there is a 30kΩ to 60kΩ pull up resister in place. The pin will be pulled low for greater that the minimum time require, therefore Reset should be successful.

BigDog

The pull-up isn't required. Most AVRs including ATMEGA32 have internal pull-up on the reset pin. According to the datasheet, R(Rst) - the reset pin pull-up resistor has a value that lies between 30kΩ and 60kΩ.

Hope this helps.
Tahmid.
 
The pull-up isn't required. Most AVRs including ATMEGA32 have internal pull-up on the reset pin. According to the datasheet, R(Rst) - the reset pin pull-up resistor has a value that lies between 30kΩ and 60kΩ.

It depends on how they have it wired Tahmid.

If they have the Reset Pin tied to directly VCC, which many people do regardless of the internal pull up resistor. They will experience a short if they jumper it to ground without an external pull up resistor in place.
 

Yes, that obviously. So, to clarify, there is no need to connect the Reset pin to Vcc directly or with a resistor. You can just leave it like that as there is an internal pull-up, and reset action will be done if the Reset pin is brought to ground.
 

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