I use an ATMega328AU a lot usually with the 8MHz internal RC oscillator
Now I know what brown out detection is, I know what it does i.e it holds the processor in a reset state if the voltage drops below the threshold
I am reading this
Which seems to recommend external circuitry but I am not clear if this is essential?
My first question is
Can I just use the BOD fuse set to the relevant value and not need any circuitry except the standard pull up on reset with a 0.1uF cap to ground?
if this is fine then I wonder why anyone would bother with external circuitry? what does it bring?
Now my main question is what level should I go for if I am running at 5VDC 8MHz
I have seen a graph somewhere displaying the safe operating area based on clock speed and voltagebut I can't find it at the minute!, I havent looked very hard yet
Looking at the fuses I have three options
I am sure the 4.3V would be fine but what happens if I choose 1.8V? or 2.7?
What do the freaks use?