AVR-Chat

--- In AVR-Chat@yahoogroups.com, John Samperi <samperi@...> wrote:

> Even if the BOD is disabled? ...

Actually, yes.  In the MCUs I use, and the ATtiny25, the reset function 
is separate from and in addition to BOD.  You can see this depicted in 
the data sheet (Figure 9-1 in the 12/06 revision).  Separate sections 
describe the POR (Section 9.3) and BOD (9.5) functions.

So, yes, I have shipped product intentionally without BOD enabled.  
There have been no reports of power-up failures.  What does happen 
occasionally, however, is that if power is applied and then removed 
almost immediately (or bounces on the way down) you can lose fuses or 
even Flash data.  *This* is why BOD is so important, not to ensure a 
good power-up reset.

So, I would say that the OP should follow your advice with regard to 
enabling BOD and making sure the reset line is not an antenna but can 
otherwise trust the ATtiny to reset itself on power-up without an 
external RC or reset chip.

Graham.