AVR-Chat

Putting a capacitor and resistor on the reset line is archaic and doesn't do
anything to improve the performance of the AVR chip.  Period.  It comes from
the "classic" AVR days - and even then it was useless.  You need a proper
external reset chip for those processors.  Any of the mega or tiny series
processors has a built in BOD circuit which (IMHO) renders all the external
doodads pointless.

My recommendation: take off the R-C, enable the BOD (that is separate from
setting the voltage), and set your fuses for the maximum delay (64ms).

-----Original Message-----
...
>
>         I'm having a weird problem with a Mega8 running on the
>internal clock oscilator at 1 MHz. The internal Power-on Reset
>seems not to be working.
>         Every time I power up the circuit, I have to manually reset
>the Mega8. The power at the Vcc pin rises from 0 to +5V in 4mS.
>The RESET pin has a 22k to +5V and 4.7uF to GND.
>         Have tried several fuses combinations but no luck.
>         Am I missing something?
>
>         Thanks.
>         Mark Jordan