XC886/888CLM
Serial Interfaces
User’s Manual
12-18
V1.3, 2010-02
Serial Interfaces, V 1.0
When
f
PCLK
=24 MHz, the baud rate range between 1.4 kHz to 333.3 kHz can be
detected. In order to increase the detection accuracy of the baud rate, the following
examples serve as a guide to select BGSEL value:
•
If the baud rate falls in the range of 1.4 kHz to 2.8 kHz, selected BGSEL value is
“11
B
”.
•
If the baud rate falls in the range of 2.8 kHz to 5.5 kHz, selected BGSEL value is
“10
B
”.
•
If the baud rate falls in the range of 5.5 kHz to 11 kHz, selected BGSEL value is “01
B
”.
•
If the baud rate falls in the range of 11 kHz to 333.3 kHz, selected BGSEL value is
“00
B
”. If the baud rate is 20kHz, the possible values of BGSEL that can be selected
are "00
B
", ”01
B
”, "10
B
", and "11
B
". However, it is advisable to select "00
B
" for better
detection accuracy.
The baud rate can also be detected when the system is in the slow-down mode. For
detection of the standard LIN baud rate, the required minimum
f
PCLK
is 2 MHz, for which
the baud rate range that can be detected is between 0.12 kHz to 27.7 kHz.
Register BG contains the 8-bit reload value for the baud rate timer.
BG
Baud Rate Timer/Reload Register
Reset Value: 00
H
7
6
5
4
3
2
1
0
BR_VALUE
rwh
Field
Bits
Type Description
BR_VALUE
[7:0]
rwh
Baud rate Timer/Reload Value
Reading returns the 8-bit content of the baud rate
timer; writing loads the baud rate timer/reload value.
Note: BG should only be written if R = 0.
*
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