Atmega328P problems vcc voltage drop

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hello

working on project standalone atmega328p running @ 8mhz (external resonator 0.5%) @ 2.8v. have disabled internal bod , use external voltage supervisor instead pulls reset pin low when vcc goes below 2.6v.

i have rather large cap on input vcc falls slow (0.5v/s) have checked reset pin , clean low when triggered doesn't jump , down.

the problem microcontroller don't seems "shutdown" in setup. seems mess millis() , other things random eeprom writes...

if use same voltage supervisor 2.7v threshold or use internal 2.7v bod problem goes away cannot have threshold set 2.7v close of tolerance 2.8v.

i have tried removing voltage supervisor bod still disabled , noticed around 2.6v same problems.

from understand atmega328p run @ 8mhz down approx 2.5v cutting of @ 2.6v shouldn't problem that.

any thoughts on highly appriciated.

best regards

got me stumped. stuff did seems correct per datasheet.
if no better suggestions come up, try contacting atmel tech support.
http://www.atmel.com/design-support/
select "open support case"


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