I haven't finalized the layout nor the software yet. I naver take hasty decisions, and this is no time to start... That's why I'm checking up on this *before* I decide. It seems to me that in worst case scenario (following the specs), I can get a minimum speed of 3.65 MHz. That would be equivialent of 9.33 % error or 9.73 us pr bit. start-bit + 8bits = 9*9.73 and that is 87.59 us. Since I do centered sampling I have a maximum of about 50 us to go on if I manage to resynch to the next start-bit. (My rx routine skips almost 50us so that it can regain some lost time if this should be the case...) It puts me in the rather red area called bummer if worst case happens. The other way, with a speed increase, the max deviation is smaller. Kyrre ----- Original Message ----- From: "Richard Prosser" To: Sent: Friday, November 08, 2002 2:52 AM Subject: Re: [PIC]: How is the stability of the 16F628's internaloscillator ? > Is it too late for the software to measure the incoming baud rate > (periodically ?) & adjust as required? > > RP > > > > We're talking about 2-4000 units so I'm a little nervous. > > It's not as much cutting production cost, as it is board space / layout... > Because of some restraints I can only use single sided... This is what > makes the layout a challenge. > > Kyrre > > ----- Original Message ----- > From: "Josh Koffman" > To: > Sent: Friday, November 08, 2002 3:52 AM > Subject: Re: [PIC]: How is the stability of the 16F628's internaloscillator > ? > > > > I agree, it isn't so bad, the problem is that you can never be > > absolutely sure it will work from chip to chip. On a one off for > > personal use it may be fine, but there are many that would refuse to put > > such a device on the market. > > > > Josh > > -- > > A common mistake that people make when trying to design something > > completely foolproof is to underestimate the ingenuity of complete > > fools. > > -Douglas Adams > > > > Kyrre Aalerud wrote: > > > That wasn't so bad? > > > > > > Another chip gave me 1024 at normal temp... > > > They ar probably from same batch, but it seems very good :-) > > > > -- > > http://www.piclist.com hint: To leave the PICList > > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > > > > > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > > -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu