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UPD17015 Datasheet(PDF) 64 Page - NEC

Part # UPD17015
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR PORTABLE RADIOS
PDF  120 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17015 Datasheet(HTML) 64 Page - NEC

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µPD17015
(5) PLL data setting example
The data to be set to receive an FM band broadcast station is shown below.
Receiving frequency
: 100.0 MHz (FM band)
Reference frequency
: 25 kHz
Intermediate frequency : +10.7 kHz
Division value N is:
N =
fVCOH
=
100.0 + 10.7
= 4428 (decimal)
fr
0.025
= 114CH (hexadecimal)
Data is written into the PLL data and PLL mode selection registers as follows:
PLLR
0 0 0 1
0 0 0 1
0 1 0 0
1 1 0 0
11
4
C
11.7
STATE AT RESET
11.7.1
At Power-On Reset
Since the PLL mode selection register is initialized to 0000B, the PLL disabled state is set.
11.7.2
At Clock-Stop
The PLL disabled state is set at the time the CE pin drops to low level.
11.7.3
At CE Reset
(1) CE reset caused by clock stop
Since clock-stop initializes the PLL mode selection register to 0000B, the PLL disabled state is set.
(2) CE reset when clock not stopped
Since the PLL mode selection register retains its previous state, the previous state is set when the CE pin rises
to high level.
11.7.4
During the Halt State
If the CE pin is high level, the set state is held.
PLLMD
1 0 1 1
VHF, 25 kHz



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