UPD17015GS datasheet(62/120 Pages) NEC

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µPD17015

(4) Division value N computation method

Division value N is computed as follows:

N =

fVCOL

: VCOL pin input frequency

: Reference frequency

(5) PLL data setting example

The method of setting the data to receive a MF band broadcast station is shown below.

Receiving frequency

: 1422 kHz (MW band)

Reference frequency

: 3 kHz

Intermediate frequency : +450 kHz

Division value N is:

N =

fVCOL

1422 + 450

= 624 (decimal)

= 270H (hexadecimal)

Data is written to the PLL data register and PLL mode selection register as follows:

11.6.2

Pulse Swallow Method (HF)

(1) Selection of the division method

The pulse swallow method is selected by the PLLMD0 or PLLMD1 flag of the PLL mode selection register.

(2) Pins to be used

The VCOL pin becomes available when the pulse swallow method is selected.

(3) Reference frequency fr setting

The reference frequency is set with the PLLRFCK0 or PLLRFCK1 flag of the PLL mode selection register.

(4) Division value N computation

Division value N is computed as follows:

N =

fVCOL

: VCOL pin input frequency

: Reference frequency

PLLR

0 0 1 0

0 1 1 1

0 0 0 0

Any value

PLLMD

0 1 0 1

MF, 3 kHz

UPD17015GS Datasheet(PDF) 62 Page - NEC

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