ST10F280_12 datasheet(149/239 Pages) STMICROELECTRONICS

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ST10F280

Serial channels

Doc ID 8673 Rev. 3

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14.1.1

ASCO in asynchronous mode

In asynchronous mode, 8 or 9-bit data transfer, parity generation and the number of stop bit

can be selected. Parity framing and overrun error detection is provided to increase the

reliability of data transfers. Transmission and reception of data is double-buffered. Full-

duplex communication up to 1.25M Bauds (at 40MHz of fCPU) is supported in this mode.

Figure 56.

Asynchronous mode of serial channel ASC0

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 register, taken as unsigned 13 Bit integer,

(S0BRS) represents the value of Bit S0BRS (‘0’ or ‘1’), taken as integer.

BAsync =

fCPU

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

S0BRL = (

fCPU

16 x [2 + (S0BRS)] x BAsync

) 1

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