Hi,

i have a circuit that must be operated about 3.6 v. the first version for
simplicity was done at 5v and its works ok, but when i down the supply to
3.6 v, things go wrong.

the program show 3 pairs of digits in a two 7 segment, comun catode led
display, using 2 port for column scanning and 7 bits of a port for the 7
segment. what is show is saved in 6 bytes, showing first the first two, then
the next two, next the last two and finally a pause in off. when i lower the
supply, it not advance to the next pair of two segment, but still does the
column scanning showing the two digits alternating.

at 4.3 v it works fine, and the device is windowed. the BOR is disabled. the
xtal is 3.579 Mhz, coupled with 22 pf capacitor. I assume that the device is
working, because is showing alternating the first two digits, but it is
perhaps reseting and starting again and again.

what is wrong?, any help will be appreciated.

sorry for my bad english.

Rodrigo Valladares P.

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