ST10F296E datasheet(77/346 Pages) STMICROELECTRONICS

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The bootstrap loader

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Figure 11.

Baud rate deviation between the host and ST10F296E

The minimum baud rate (BLow in Figure 11) is determined by the maximum count capacity

of Timer T6, when measuring the zero byte, i.e. it depends on the CPU clock. Using the

maximum T6 count as 216 in the formula, the minimum baud rate can be calculated. The

lowest standard baud rate in this case is 1200 Baud. Baud rates below BLow cause T6 to

overflow. In this case ASC0 cannot be initialized properly.

The maximum baud rate (BHigh in Figure 11) is the highest baud rate where the deviation

does not exceed the limit, i.e. all baud rates between BLow and BHigh are below the deviation

limit. The maximum standard baud rate that fulfills this requirement is 19200 Baud.

Higher baud rates, however, may be used as long as the actual deviation does not exceed

the limit. The baud rate marked ‘I’ in Figure 11 may violate the deviation limit, while the

higher baud rate, marked ‘II’, in Figure 11 stays well below it. This depends on the host

interface.

BLow

2.5%

BHigh

BHOST

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ST10F296E Datasheet(PDF) 77 Page - STMicroelectronics