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how to use Index Track in quadrature encoder mode

Question asked by Janvi on Dec 26, 2012
Latest reply on Jan 1, 2013 by iqbal.m.asif
have 2 timer channels (CH1+CH2) setup in quadrature encoder mode and all things work fine. The encoder (Avago HEDS 5540) has a third index channel with very narrow pulse per revolution. Is ist possible to use this signal for timer Reset or Prelaod event ? What input pin is required ? (ETR?) The CH1/2 input Frequency is above 100khz and software interrupt delay seems too slow