ST10F280 datasheet(117/186 Pages) STMICROELECTRONICS

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ST10F280

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Baud Rate Generation

The Baud rate generator is clocked by fCPU/2. The

timer is counting downwards and can be started

or stopped through the global enable Bit SSCEN

in register SSCCON. Register SSCBR is the

dual-function

Baud

Rate

Generator/Reload

enabled, returns the content of the timer. Reading

SSCBR, while the SSC is disabled, returns the

programmed reload value. In this mode the

desired reload value can be written to SSCBR.

Note

Never write to SSCBR, while the SSC is

enabled.

The formulas below calculate the resulting Baud

rate for a given reload value and the required

reload value for a given Baud rate:

(SSCBR) represents the content of the reload

Table 26 lists some possible Baud rates against

the required reload values and the resulting bit

times for a 40MHz CPU clock.

Baud rateSSC =

fCPU

2 x [(SSCBR) + 1]

SSCBR = (

fCPU

2 x Baud rateSSC

) 1

Table 26 : Synchronous Baud Rate and Reload

Values

Baud Rate

Bit Time

Reload Value

Reserved use a

reload value > 0.

---

10M Baud

100ns

0001h

5M Baud

200ns

0003h

2.5M Baud

400ns

0007h

1M Baud

µs

0013h

100K Baud

µs

00C7h

10K Baud

100

µs

07CFh

1K Baud

1ms

4E1Fh

306 Baud

3.26ms

FF4Eh

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