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VR4102 Datasheet(PDF) 426 Page - NEC |
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VR4102 Datasheet(HTML) 426 Page - NEC |
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426 / 701 page  CHAPTER 21 KIU (KEYBOARD INTERFACE UNIT) 426 • Key scan stop When the SCANSTP bit is set to “1”, the key scan sequencer stops. However, if this bit is set to “1” during a key scan operation, the key scan sequencer stops after the current set of key data is received. • Key scan start When the SCANSTART bit is set to “1”, the key scan sequencer starts regardless of key contact detection. • Key scan auto stop setting When the ATSTOP bit is set to “1”, the key scan sequencer stops automatically when the data remains all zeros for the number of key scan times specified by STOPREP. • Key auto scan setting When the ATSCAN bit is set to “1”, the key scan operation automatically starts after key contact is detected. |
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