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%00110 = NCO frequency This mode overrides OUT to control the pin output state. X[15:0] establishes a base period in clock cycles which forms the empirical high and low times. Y[31:0] will be added into Z[31:0] at each base period. The pin output will reflect Z. IN will be raised whenever Z overflows. During reset (DIR=0), IN is low, the output is low, and Z is set to zero.