Manual

84
AT89C5131
4136A–USB–03/03
Figure 38. Internal Baud Rate
• The baud rate for UART is token by formula:
BRG
0
1
/6
BRL
/2
0
1
INT_BRG
SPD
BRR
SMOD1
auto reload counter
overflow
CLK PERIPH
Baud_Rate =
2
SMOD1
x FCLK PERIPH
2 x 2 x 6
(1-SPD)
x 16 x [256 - (BRL)]
(BRL) = 256 -
2
SMOD1
x FCLK PERIPH
2 x 2 x 6
(1-SPD)
x 16 x Baud_Rate