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HT98R068-1 Datenblatt(PDF) 73 Page - Holtek Semiconductor Inc

Teilenummer HT98R068-1
Bauteilbeschribung  Two Way Radio 8-Bit MCU
Download  116 Pages
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Hersteller  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT98R068-1 Datenblatt(HTML) 73 Page - Holtek Semiconductor Inc

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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
detector will remain active if the LVDEN bit is high. After enabling the Low Voltage Detector, a
time delay tLVDS should be allowed for the circuitry to stabilise before reading the LVDO bit. Note
also that as the VDD voltage may rise and fall rather slowly, at the voltage nears that of VLVD, there
may be multiple bit LVDO transitions.
VD D
V LV D
LV DE N
LV DO
t LV DS
LVD Operation
Audio Processor
The device includes an audio processor function for processing of signals received on the RF carrier.
Aimed specifically at low cost radio communication products the audio processor section contains
all the transmitter and receiver functions required to process the necessary in-band audio signals
such as compression, expansion, scrambling and de-scrambling.
Audio Receiver
The following diagram shows the main functional blocks of the receiver audio processor.
Audio Filters
De-Emphasis
Expander
De-Scrambler
LPF-270
P�og�ammed/Use�
Defined CTCSS Decode�
HPF-300
P�og�ammed/Use�
Defined ��-�it DCS Decode�
DTMF
Decoders
Selective Call
Decoders
A�dio_
o�t
De-m�x
De-m�x
In Band Decode�s
Tone Sq�elch Decode�s
Receive ��nctions
Audio Filters
De-Emphasis
Expander
De-Scrambler
LPF-270
P�og�ammed/Use�
Defined CTCSS Decode�
HPF-300
P�og�ammed/Use�
Defined ��-�it DCS Decode�
DTMF
Decoders
Selective Call
Decoders
A�dio_
o�t
De-m�x
De-m�x
In Band Decode�s
Tone Sq�elch Decode�s
Receive ��nctions
Receiver Block Diagram


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