半導体集積回路、音響信号処理装置及び操作装置

  • Inventors:
  • Assignees: ヤマハ株式会社
  • Publication Date: June 27, 2012
  • Publication Number: JP-4961788-B2

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the load of a CPU required for scanning the state of a button. <P>SOLUTION: In an integrated circuit 10 having the CPU 11 and the button RAM 35 that can be accessed from the CPU 11, there are provided a scan control section 31 that accesses a button circuit 48 having a plurality of buttons except the CPU 11 for outputting an analog signal for indicating the state of each button periodically and successively; an ADC 32 for converting a signal outputted by the button circuit 48 to digital data; a change width restriction circuit; and an LPF 34. The converted digital data are written to the button RAM 35. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

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