HD6433935 Hitachi, HD6433935 Datasheet - Page 342
HD6433935
Manufacturer Part Number
HD6433935
Description
8-Bit MICROCONTROLLER
Manufacturer
Hitachi
Datasheet
1.HD6433935.pdf
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the proper FLEX channel, and fully interpreting the code words that are passed to the host from
the FLEX decoder.
TM
Additional Information: Additional Information on the FLEX
protocol decoder chip set and
FLEXstack™ software can be found at the following website:
http://www.hitachi.co.jp/Sicd/English/Products/micom/stack/stack.html.
12.1.2
System Block Diagram
Synthesizer Programming Control
User
Interface
Receiver
Control
Receiver
This LSI
38.4 or 40 kHz clock
S0/IFIN
160 kHz Oscillator
Low Battery
LOBAT
Detector
Figure 12-1 Example Block Diagram Using Internal Demodulator
When configured to use the internal demodulator, the FLEX decoder connects to a receiver
capable of generating a limited (i.e. 1-bit digitized) 455 kHz or 140 kHz IF signal. In this mode,
the FLEX decoder has 7 receiver control lines used for warming up and shutting down a receiver
in stages. The FLEX decoder has the ability to detect a low battery signal during the receiver
control sequences. It interfaces to a host MCU through a standard SPI. It has a 1 minute timer that
offers low power support for a time of day function on the host.
When using the internal demodulator, the oscillator frequency (or external clock) must be 160
kHz. The CLKOUT signal can be programmed to be either a 38.4 kHz signal created by
fractionally dividing the oscillator clock, or a 40 kHz signal creating by dividing the oscillator
clock by 4.
330
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