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ST10R272L - GENERAL PURPOSE TIMER UNITS each transition on one or both of the external input pins which gives 2-fold or 4-fold resolution to the encoder input. T3R T3IN edge detect T3 Up/Down T3IR T3OUT T3OTL T3OE T3EUD phase detect XOR MUX T3UD Figure 73 Core timer T3 in incremental interface mode Bitfield T3I in the T3CON control register selects the triggering transitions (see table below). In this mode, the sequence of the transitions of the two input signals is evaluated, and generates count pulses as well as the direction signal. So, T3 is modified automatically according to the speed and the direction of the incremental encoder, its contents therefore always represent the encoder’s current position. T3I Triggering Edge for Counter Increment/Decrement 000 None. Counter stops 001 Any transition (rising or falling edge) on T3IN 010 Any transition (rising or falling edge) on T3EUD 011 Any transition (rising or falling edge) on T3 input (T3IN or T3EUD) 1XX Reserved. Do not use this combination Table 34 GPT1 core timer T3 (incremental interface mode) input edge selection 198/320
