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UPD17708 Datasheet(PDF) 282 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/
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UPD17708 Datasheet(HTML) 282 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
Figure 18-8. Configuration of IF Counter Data Register
Data buffer
DBF3
DBF2
Name
IF counter
data register
Symbol
IFC
Peripheral address
43H
DBF1
DBF0
b3 b2 b1 b0
b6 b5 b4
b10 b9 b8 b7
b13 b12
b15 b14
b11
Peripheral register
0
Transfer data
Valid data
GET can be executed
PUT changes nothing
16
Count value of frequency counter
x
216–1 (FFFFH)
IF counter function
• FMIF count mode of FMIFC pin
Counts rising edge of signal input to
P1C0/FMIFC pin via 1/2 divider
• AMIF count mode of AMIFC pin
Counts rising edge of signal input to
P1C1/AMIFC pin
• AMIF count mode of FMIFC pin
Counts rising edge of signal input to
P1C0/FMIFC pin
External gate counter function
Counts rising edge of internal reference
frequency signal from rising edge to next
rising edge of signal input to
P2A0/FCG0 or P2A1/FCG1 pin
Once the IF counter data register has counted up to FFFFH, it remains at FFFFH until the counter is reset.



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