Function description: Incremental counter inputs
a) Single mode
In single mode, if trace A of the incremental encoder signal is on "high", the system counts with each
rising edge of trace B.
b) Double mode
In double mode, the system counts with each rising and falling edge of trace B.
c) Quadruple mode
In quadruple mode, the system counts with each rising and falling edge of traces A and B.
d) Direct mode
In direct mode, the system counts with each falling edge of trace A, with input B serving as a gate
input. The system counts only if trace B is on "high".
Moreover, in direct mode, the direction of counting can be programmed through software.
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Fig. 3-5: Incremental counter: Single mode
Fig. 3-6: Incremental counter: Double mode
Fig. 3-7: Incremental counter: Quadruple mode
Fig. 3-8: Incremental counter: Direct mode
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MSX-E1701
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