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MRF89XA Scheda tecnica(PDF) 73 Page - Microchip Technology

Il numero della parte MRF89XA
Spiegazioni elettronici  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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 2010-2017 Microchip Technology Inc.
Preliminary
DS70000622D-page 73
MRF89XA
3.8
Data Processing
3.8.1
DATA PROCESSING BLOCK
The MRF89XA data processing blocks are as
illustrated in the Figure 3-16. The role of the data
processing block is to interface the data to/from the
modulator/demodulator and the host microcontroller
access points (SPI, Interrupts (IRQ0 and IRQ1), DATA
pins). It also controls all the configuration registers.
The circuit contains several control blocks, which are
described in the following paragraphs.
The MRF89XA implements several data operation
modes, each with their own data path through the data
processing section. Depending on the data operation
mode selected, some control blocks are active while
others remain disabled.
3.8.2
DATA OPERATION MODES
The MRF89XA has three different data operation
modes that can be selected by the user or programmer:
• Continuous mode: Each bit transmitted or
received is accessed in real time at the DATA pin.
This mode may be used if adequate external sig-
nal processing is available.
• Buffered mode: Each byte transmitted or received
is stored in a FIFO and accessed through the SPI
bus. The host microcontroller processing over-
head reduced significantly compared to Continu-
ous mode operation. The packet length is
unlimited.
• Packet mode (recommended): User only pro-
vides/retrieves payload bytes to/from the FIFO.
The packet is automatically built with preamble,
Sync Word, and optional CRC, DC-free encoding,
and the reverse operation is performed in recep-
tion. The host microcontroller processing over-
head is further reduced compared to Buffered
mode. The maximum payload length is limited to
the maximum FIFO limit of 64 bytes.
FIGURE 3-16:
MRF89XA DATA PROCESSING BLOCK DIAGRAM
TABLE 3-4:
DATA OPERATION MODE SELECTION
Data Operation Mode
DMODE1
DMODE0
Register
Continuous
00
FTXRXIREG
Buffered
01
FTXRXIREG
Packet
1x
FTXRXIREG
Control
DATA
CONFIG
SPI
Packet
Handler
SYNC
Recognition
DATA
IRQ0
IRQ1
SDO
SDI
SCK
CSDAT
RX
TX
TX/RX
Data
MRF89XA
FIFO
(+SR)


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