Atmel AVR AT90S8515-4 Dokumentacja Pobierz pdf (Strona 57)

AT90S8515

0841G–09/01

BAUD Rate Generator The baud rate generator is a frequency divider that generates baud rates according to

the following equation:

• BAUD = Baud rate

• f

= Crystal Clock frequency

• UBRR = Contents of the UART Baud Rate register, UBRR (0 - 255)

For standard crystal frequencies, the most commonly used baud rates can be generated

by using the UBRR settings in Table 17. UBRR values that yield an actual baud rate dif-

fering less than 2% from the target baud rate are boldface in the table. However, using

baud rates that have more than 1% error is not recommended. High error ratings give

less noise immunity.

BAUD

16(UBRR 1)+

-------------------------------------=

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 111 112

Brak uwag

Atmel AVR AT90S8515-4 Dokumentacja Strona 57