ST10F276E datasheet(64/235 Pages) STMICROELECTRONICS

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ST10F276E

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The error coming from the measurement of the 29 bit is:

e1 = 6 / [PT0]

It is maximal for the smallest BRP value and the smallest number of ticks in PT0. Therefore:

e1 Max = 1.29%

To improve precision, the aim is to have the smallest BRP so that the time quantum is the

smallest possible. Thus, an error on the calculation of time quanta in a bit time is minimal.

In order to do so, the value of PT0 is divided into ranges of 1450 ticks. In the algorithm, PT0

is divided by 1451 and the result is BRP.

The calculated BRP value is then used to divide PT0 in order to have the value of (1 +

Tseg1 + Tseg2). A table is made to set the values for Tseg1 and Tseg2 according to the

value of (1 + Tseg1 + Tseg2). These values of Tseg1 and Tseg2 are chosen in order to

reach a sample point between 70% and 80% of the bit time.

During the calculation of (1 + Tseg1 + Tseg2), an error e2 can be introduced by the division.

This error is of 1 time quantum maximum.

To compensate for any possible error on bit rate, the (Re)Synchronization Jump Width is

fixed to 2 time quanta.

Table 32.

BRP and PT0 values

BRP

PT0_min

PT0_max

Comments

464

1450

1451

2900

2901

4350

4351

5800

5801

7250

7251

8700

20416

63800

20880

65250

21344

66700

Possible timer overflow

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