C167CS datasheet(280/517 Pages) INFINEON

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C167CS

Derivatives

The Asynchronous/Synchronous Serial Interface

User’s Manual

11-14

V2.0, 2000-07

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 register, taken as unsigned 13-bit integers,

<S0BRS> represents the value of bit S0BRS (i.e. ‘0’ or ‘1’), taken as integer.

Table 11-5 gives the limit baudrates depending on the CPU clock frequency and bit

S0BRS.

Table 11-5

ASC0 Synchronous Baudrate Generation

CPU clock

fCPU

S0BRS = ‘0’

S0BRS = ‘1’

Min. Baudrate

Max. Baudrate

Min. Baudrate

Max. Baudrate

16 MHz

244 Baud

2.000 MBaud

162 Baud

1.333 MBaud

20 MHz

305 Baud

2.500 MBaud

203 Baud

1.666 MBaud

25 MHz

381 Baud

3.125 MBaud

254 Baud

2.083 MBaud

33 MHz

504 Baud

4.125 MBaud

336 Baud

2.750 MBaud

BSync =

S0BRL = (

× (2 + <S0BRS>) × B

Sync

fCPU

) – 1

× (2 + <S0BRS>) × (<S0BRL> + 1)

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