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C161 Datasheet(PDF) 203 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 203 Page - Infineon Technologies AG |
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203 / 400 page  &3, 7KH*HQHUDO 3XUSRVH 7LPHU8QLWV User’s Manual 10-11 1999-08 The maximum input frequency which is allowed in incremental interface mode is f CPU/16. To ensure that a transition of any input signal is correctly recognized, its level should be held high or low for at least 8 f CPU cycles before it changes. In Incremental Interface Mode the count direction is automatically derived from the sequence in which the input signals change, which corresponds to the rotation direction of the connected sensor. The table below summarizes the possible combinations. The figures below give examples of T3’s operation, visualizing count signal generation and direction control. It also shows how input jitter is compensated which might occur if the sensor rests near to one of its switching points. Figure 10-8 Evaluation of the Incremental Encoder Signals Table 10-5 GPT1 Core Timer T3 (Incremental Interface Mode) Count Direction Level on respective other input T3IN Input T3EUD Input Rising Falling Rising Falling High Down Up Up Down Low Up Down Down Up T3IN T3EUD Contents of T3 Forward Forward Backward Jitter Jitter Note: This example shows the timer behaviour assuming that T3 counts upon any transition on any input, i.e. T3I = ’011 B’. |
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