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UPD17015GS Datasheet(PDF) 51 Page - NEC

Part # UPD17015GS
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

UPD17015GS Datasheet(HTML) 51 Page - NEC

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µPD17015
11.2
INPUT SWITCHING BLOCK AND PROGRAMMABLE DIVIDER
11.2.1
Configuration
Fig. 11-2 shows the configuration of the input switching block and programmable divider.
The input switching block consists of the VCOH and VCOL pins and their input amplifiers.
The programmable divider consists of a two-modulus prescaler, swallow counter, programmable counter, and
division method selection switches.
Fig. 11-2 Input Switching Block and Programmable Divider
DBF
16
4
12
VCOH
VCOL
VHF
HF
MF
MF
HF
VHF
PSC
VHF
HF
MF
f
N
PLLMD0 flag
PLLMD1 flag
2-4 decoder
PLL data register
12 bits
4 bits
2-modulus
prescaler
1/16, 1/17
Swallow
counter
(4 bits)
Programmable
counter (12 bits)
To
-DET
φ
PLL disable signal



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