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UPD17708 Datasheet(PDF) 211 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 211 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
15.5 Clock Generation Block
The clock generation block outputs a basic clock to set the duty factor of each output signal.
Two output frequencies, 1.125 MHz and 112.5 kHz, can be selected.
15.6 D/A Converter Output Wave
(1) shows the relationship between the duty factor and output wave.
(2) shows the output wave of each pin. Each output pin has a phase different from the others.
(1) Duty and output wave
(a) With 8-bit counter and 4.4 kHz selected
(b) With 8-bit counter and 440 Hz selected
222 ns
x = 0
x = 1
x = 2
x = 255
667 ns
888 ns
888 ns
227.56
s
µ
2.22 s
x = 0
x = 1
x = 2
x = 255
6.67 s
8.88 s
8.88 s
2.2756 ms
µ
µµ
µ



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