ST10F280_12 datasheet(153/239 Pages) STMICROELECTRONICS

tên linh kiện	ST10F280

Giải thích chi tiết về linh kiện	16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM

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ST10F280

Serial channels

Doc ID 8673 Rev. 3

153/239

Figure 58.

Synchronous serial channel SSC block diagram

14.2.1

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 register. Reading SSCBR, while

the SSC is 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 register, taken as unsigned 16 Bit integer.

Table 30 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

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