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ML9092-03 Datasheet(PDF) 50 Page - List of Unclassifed Manufacturers |
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ML9092-03 Datasheet(HTML) 50 Page - List of Unclassifed Manufacturers |
50 / 66 page FEDL9092-01 LAPIS Semiconductor ML9092-01/02/03/04 50/66 Functional Description of the Rotary Encoder Switch As shown in Figure 3, the rotary encoder switch circuit is made up of phase detection circuit, an interrupt generation circuit, an up/down counter and a parallel-in/serial-out register. Phase detection circuit UP DOWN B A Up/down counter Parallel in/serial out shift register Interrupt generation circuit To KREQ Output data Q4 Q3 Q2 Q1 Figure 3 Rotary Encoder Switch Circuit 1) Phase Detection and Interrupt Generation Circuits 1-1) Clockwise Rotation When the A and B signals are input as shown in Figure 4, the phase detection circuit outputs the UP signal after the chattering absorption period. At this time, the KREQ output goes to a high level, so that this signal can be used as the interrupt signal. The KREQ signal maintains a high level until the rotary encoder read instruction is executed. UP (internal signal) B A KREQ Chattering absorption period Figure 4 Input/Output Timing for Clockwise Rotation |
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