C8051F521A-IM 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F521A-IM

8/4/2 kB ISP Flash MCU Family

Silicon Laboratories 

C8051F52x/F53x

17.2.4. Baud Rate Calculations—Automatic Mode

If the LIN peripheral is configured for slave mode, only the prescaler and divider need to be calculated:

prescaler

=

ln

S----Y----S---C----L----K--

4000000



---1----

ln2

–

1

divider

=

----------------S----Y---S----C----L----K------------------

2prescaler + 1  20000

The following example calculates the values of these variables for a 24 MHz system clock:

prescaler = ln

2----4---5---0--0---0---0----0-

4000000



---1----

ln2

–

1

=

1.615



1

divider

=

-------2---4---5---0---0---0---0---0--------

21 + 1  20000

=

306.25  306

Table 17.3 presents some typical values of system clock and baud rate along with their factors.

Table 17.3. Autobaud Parameters Examples

System Clock (MHz)

25

24.5

24

22.1184

16

12.25

12

11.0592

8

Prescaler

1

1

1

1

1

0

0

0

0

Divider

312

306

300

276

200

306

300

276

200

168

Rev. 1.4

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