| 20 Mhz |
| Baud |
UBRR |
% of error |
| 300 |
4166 |
0.0 |
| 600 |
2082 |
0.0 |
| 1200 |
1041 |
0.0 |
| 2400 |
520 |
0.0 |
| 4800 |
259 |
0.2 |
| 9600 |
129 |
0.2 |
| 14400 |
86 |
0.2 |
| 19200 |
64 |
0.2 |
| 28800 |
42 |
0.9 |
| 38400 |
32 |
1.4 |
| 57600 |
21 |
1.4 |
| 76800 |
15 |
1.7 |
| 115200 |
10 |
1.4 |
Lady Ada Rants:
Yes, you could always use the datasheet and a calculator. But this sucks so much less.
http://www.wormfood.net/avrbaudcalc.php
Pair it with a AVR fuse calculator and you’ve solved 99% of your problems!
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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.
View more articles by Gareth Branwyn
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