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UPD17708 Datasheet(PDF) 291 Page - NEC |
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UPD17708 Datasheet(HTML) 291 Page - NEC |
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291 / 356 page  291 µPD17704, 17705, 17707, 17708, 17709 19.4 Output Waveform of BEEP The duty factor of the BEEP output waveform is 50%. Example f = 3 kHz f = 1 kHz f = 200 Hz f: output frequency of BEEP 166.7 s 166.7 s 500 s 2.5 ms 2.5 ms 500 s µ µ µ µ 19.5 Status at Reset 19.5.1 At power-ON reset The P1D0/BEEP0 and P1D1/BEEP1 pins are set in the general-purpose input port mode. 19.5.2 At WDT&SP reset The P1D0/BEEP0 and P1D1/BEEP1 pins are set in the general-purpose input port mode. 19.5.3 On execution of clock stop instruction The P1D0/BEEP0 and P1D1/BEEP1 pins are set in the general-purpose I/O port mode, and retain the previous input or output status. 19.5.4 At CE reset The P1D0/BEEP0 and P1D1/BEEP1 pins are set in the general-purpose I/O port mode, and retain the previous input or output status. 19.5.5 In halt status The previous status is retained. |
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