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Reset pin of microcontroller!!

coolbro

Oct 18, 2012
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Oct 18, 2012
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What happen if I dont connect reset pin of microcontroller. Will my microcontroller work properly?
 

CocaCola

Apr 7, 2012
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Apr 7, 2012
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Depends... On some chips if left floating (unconnected) you can get periodic random resets, full out repeated non-stop resetting, or it might work fine... On some chips you can disable it with a fuse when you flash the firmware and use it as a regular I/O pin, on others you can't...
 

Harald Kapp

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Nov 17, 2011
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Just don't do it. Tie the reset pin to a defined level using a pull-up or pull-down resistor.

Beware of disabling the reset pin by programming a fuse or similar. Some chips can no longer be programmed with low voltages (or in system) if the reset pin is disabled.

When in doubt, consult the manual of the µC in question.
 

Zork

Oct 26, 2012
11
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Oct 26, 2012
Messages
11
Hi coolbro, unfortunately not all microcontrollers have a pull-up (or down) reset to drive a stable level to this pin when floating, you have to look on the datasheet of the device, but it isn't a good idea if the ic doesn't have an internal circuit to monitor the voltage on the power supply (brown-out detector).
 
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