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Will input from the second key onward be detected?

Latest Updated:03/01/2005

Question:

(Interrupts)   Key-input interrupt occurs at the falling edge of an input signal. If a signal is inserted after a falling edge (as if "L" output continues), will input from the second key onwards be detected? [2005/03/01]

Answer:

No. If the signal described above is used, input from the second key onwards will not be detected because the signal level is not changed when the signal keeps "L" level. The valid waveform for the key-input interrupt is the falling edge from "H" level to "L" level. (#104776)
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