AN1687 データシートの表示（PDF） - Motorola => Freescale
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AN1687 Datasheet PDF : 12 Pages
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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
AN1687
DIGITAL ENCODING DESCRIPTION
As mentioned above, it is necessary to encode the raw
RS–232 data prior to RF transmission since the incoming
data stream can, and usually will, contain a DC component
and has no pre–defined minimum frequency component.
Figure 5 is a block diagram of the digital encoder/decoder
section, and Figure 6 shows a possible implementation of the
encoder.
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DB25
P2
Figure 5. Encoder/Decoder Block Diagram
(Baseset Shown)
Translator
MCU
Parallel-Serial/
Encoder
ETXD
TXD
ERXD
RXD
ERTS
RTS
ECTS
CTS
TXD
D(0-7)
RXD
I
RTS
D/C
CTS
NTXA
TXR
CK
D(0-7)
DOUT
TXD
I
D/C
NTXA
TXR
CK
To RF
Transceiver
Baseband
DCK
ENB
DATA
NRXA
RXR
FE
16XCK
Serial-Parallel/
Decoder
DETI
DIN
RCD
I
D/C
NRXA
RXR
FE
CK
MOTOROLA SEMICONDUCTOR APPLICATION INFORMATION
5
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