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UPD17015GS Datasheet(PDF) 63 Page - NEC |
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UPD17015GS Datasheet(HTML) 63 Page - NEC |
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63 / 120 page  63 µPD17015 PLLR 0 0 0 1 0 1 0 0 0 1 0 0 0 1 1 0 14 4 6 PLLMD 1 1 1 0 HF, 5 kHz 11.6.3 Pulse Swallow Method (VHF) (1) Selection of division method The pulse swallow method is selected by setting the PLLMD0 or PLLMD1 flag of the PLL mode selection register. (2) Pins to be used The VCOH pin becomes available when the pulse swallow method is selected. (3) Reference frequency fr setting The reference frequency is set by the PLLRFCK0 or PLLRFCK1 flag of the PLL mode selection register. (4) Division value N computation method Division value N is computed as follows: N = fVCOH fr fVCOH : VCOH pin input frequency fr : Reference frequency (5) PLL data setting example The data to be set to receive a SW band broadcast station is shown below. Receiving frequency : 25.50 MHz (SW band) Reference frequency : 5 kHz Intermediate frequency : +450 kHz Division value N is: N = fVCOL = 25500 + 450 = 5190 (decimal) fr 5 = 1446H (hexadecimal) Data is written into the PLL data and PLL mode selection registers as follows: |
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