C167CS datasheet(317/517 Pages) INFINEON

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C167CS

Derivatives

The Bootstrap Loader

User’s Manual

15-7

V2.0, 2000-07

Figure 15-3

Baudrate Deviation between Host and C167CS

The minimum baudrate (BLow in Figure 15-3) is determined by the maximum count

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

The minimum baudrate is obtained by using the maximum T6 count 216 in the baudrate

formula. Baudrates below BLow would cause T6 to overflow. In this case ASC0 cannot

be initialized properly and the communication with the external host is likely to fail.

The maximum baudrate (BHigh in Figure 15-3) is the highest baudrate where the

deviation still does not exceed the limit, i.e. all baudrates between BLow and BHigh are

below the deviation limit. BHigh marks the baudrate up to which communication with the

external host will work properly without additional tests or investigations.

Higher baudrates, however, may be used as long as the actual deviation does not

exceed the indicated limit. A certain baudrate (marked I) in Figure 15-3) may e.g. violate

the deviation limit, while an even higher baudrate (marked II) in Figure 15-3) stays very

well below it. Any baudrate can be used for the bootstrap loader provided that the

following three prerequisites are fulfilled:

• the baudrate is within the specified operating range for the ASC0

• the external host is able to use this baudrate

• the computed deviation error is below the limit.

Table 15-2

Bootstrap Loader Baudrate Ranges

fCPU [MHz]

BMAX

312,500

375,000

500,000

625,000

781,250 1,031,250

BHigh

9,600

19,200

38,400

BSTDmin

600

1,200

BLow

344

412

550

687

859

1,133

MCA02260

2.5%

Low

BHigh

ΙΙ

BHost

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