ST10F269ZX datasheet(99/184 Pages) STMICROELECTRONICS

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ST10F269

14 - SERIAL CHANNELS

99/184

Synchronous Mode Baud Rates

For

synchronous

operation,

the

Baud

rate

generator provides a clock with 4 times the rate of

the established Baud rate. The Baud rate for

synchronous operation of serial channel ASC0

can be determined by the following formula:

(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 clock speed as

given in Table 30.and Table 31

Note: The deviation errors given in the Table 30 are rounded. To avoid deviation errors use a Baud rate

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

BSync =

S0BRL = (

fCPU

4 x [2 + (S0BRS)] x BSync

) - 1

fCPU

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

Table 30 : 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)

5 000 000

0.0% / 0.0%

0000 / 0000

3 333 333

0.0% / 0.0%

0000 / 0000

112 000

+1.5% / -0.8%

002B / 002C

112 000

+2.6% / -0.8%

001C / 001D

56 000

+0.3% / -0.8%

0058 / 0059

56 000

+0.9% / -0.8%

003A / 003B

38 400

+0.2% / -0.6%

0081 / 0082

38 400

+0.9% / -0.2%

0055 / 0056

19 200

+0.2% / -0.2%

0103 / 0104

19 200

+0.4% / -0.2%

00AC / 00AD

9 600

+0.2% / -0.0%

0207 / 0208

9 600

+0.1% / -0.2%

015A / 015B

4 800

+0.1% / -0.0%

0410 / 0411

4 800

+0.1% / -0.1%

02B5 / 02B6

2 400

0.0% / 0.0%

0822 / 0823

2 400

+0.1% / -0.0%

056B / 056C

1 200

0.0% / 0.0%

1045 / 1046

1 200

0.0% / 0.0%

0AD8 / 0AD9

900

0.0% / 0.0%

15B2 / 15B3

600

0.0% / 0.0%

15B2 / 15B3

612

0.0% / 0.0%

1FE8 / 1FE9

407

0.0% / 0.0%

1FFD / 1FFE

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