EDN, August 2nd, 2001
ROTARY ENCODERS usually provide quadrature pulses that indicate both the amount of rotation and the direction (Figure 1). A microcontroller can calculate the rotation direction and keep track of angular movement. Many microcontrollers' interrupt inputs, such as those on the Zilog Z86C90, can detect only a falling edge. Some with programmable edge detection, such as the Zilog Z86E30, can function with either rising or falling edges but not both. However, for maximum resolution, it is desirable to look at each rising and falling edge. In these cases, you need four inputs to read the encoder. F...
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