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[SOLVED] Atmega freezes and needs external reset circuit

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alexhugo

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Hi,
I am using ATMEGA48. I have following peoblems:
1- Whatever I do, I must have external reset circuit. I set the BODLEVEL fuses to be 4.3 volts hoping that BOD will reset my microcontroller when VCC starts going up but it doesn't work that way. I even programmed the RSTDISBL fuse but that doesn't help either.
2- I don't know why touching the capacitor (or the reset pin itself) that is used for reset, hangs the micro. I am using 10K resistor and 100u cap for reset circuit. Please don't say that I should not touch the reset signal. I know that but this means that's very sensitive to noise. Isn't it?
3- When micro freezes because of the problem in item 2, watchdog timer doesn't reset the chip. Watchdog timer works in other times. For example when I remove the wdr (watch dog reset) command, or I don't call the place that has wdr, I see that my micro gets reset but freezing because of touching the capacitor of the reset circuit is not reset by watch dog timer.

Thanks in advance
Alex
 

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