ST10F269ZX datasheet(96/184 Pages) STMICROELECTRONICS

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14 - SERIAL CHANNELS

ST10F269

96/184

Asynchronous Mode Baud rates

For asynchronous operation, the Baud rate

generator provides a clock with 16 times the rate

of the established Baud rate. Every received bit is

sampled at the 7th, 8th and 9th cycle of this clock.

The Baud rate for asynchronous operation of

serial channel ASC0 and the required reload

value for a given Baud rate can be determined by

the following formulas:

(S0BRL) represents the content of the reload

(S0BRS) represents the value of bit S0BRS (‘0’ or

‘1’), taken as integer.

Using the above equation, the maximum Baud

rate can be calculated for any given clock speed.

Baud rate versus reload register value (SOBRS=0

and SOBRS=1) is described in Table 28. and

Table 29

Note: The deviation errors given in the Table 28 are rounded. To avoid deviation errors use a Baud rate

crystal (providing a multiple of the ASC0/SSC sampling frequency).

BAsync =

fCPU

16 x [2 + (S0BRS)] x [(S0BRL) + 1]

S0BRL = (

fCPU

16 x [2 + (S0BRS)] x BAsync

) - 1

Table 28 : Commonly Used Baud Rates by Reload Value and Deviation Errors (PQFP144 devices)

S0BRS = ‘0’, fCPU = 40MHz

S0BRS = ‘1’, fCPU = 40MHz

Baud Rate (Baud)

Deviation Error

Reload Value

(hexa)

Baud Rate (Baud)

Deviation Error

Reload Value

(hexa)

1 250 000

0.0% / 0.0%

0000 / 0000

833 333

0.0% / 0.0%

0000 / 0000

112 000

+1.5% / -7.0%

000A / 000B

112 000

+6.3% / -7.0%

0006 / 0007

56 000

+1.5% / -3.0%

0015 / 0016

56 000

+6.3% / -0.8%

000D / 000E

38 400

+1.7% / -1.4%

001F / 0020

38 400

+3.3% / -1.4%

0014 / 0015

19 200

+0.2% / -1.4%

0040 / 0041

19 200

+0.9% / -1.4%

002A / 002B

9 600

+0.2% / -0.6%

0081 / 0082

9 600

+0.9% / -0.2%

0055 / 0056

4 800

+0.2% / -0.2%

0103 / 0104

4 800

+0.4% / -0.2%

00AC / 00AD

2 400

+0.2% / -0.0%

0207 / 0208

2 400

+0.1% / -0.2%

015A / 015B

1 200

0.1% / 0.0%

0410 / 0411

1 200

+0.1% / -0.1%

02B5 / 02B6

600

0.0% / 0.0%

0822 / 0823

600

+0.1% / -0.0%

056B / 056C

300

0.0% / 0.0%

1045 / 1046

300

0.0% / 0.0%

0AD8 / 0AD9

153

0.0% / 0.0%

1FE8 / 1FE9

102

0.0% / 0.0%

1FE8 / 1FE9

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