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MC33596 Datasheet(PDF) 14 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 14 Page - Freescale Semiconductor, Inc

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MC33596 Data Sheet, Rev. 4
Receive Mode
Freescale Semiconductor
14
Figure 5. Typical Transfer in Receive mode with Data Manager
11.2.1 Data Manager Functions
In receive mode, Manchester coded data can be processed internally by the data manager. After decoding,
the data is available on the digital interface, in SPI format. This minimizes the load on the MCU.
The data manager, when enabled (DME = 1), has five purposes:
First ID detection: the received data are compared with the identifier stored in the ID register.
Then the HEADER recognition: the received data is compared with the data stored in the
HEADER register.
Clock recovery: the clock is recovered during reception of the preamble and is computed from the
shortest received pulse. While this signal is being received, the recovered clock is constantly
updated to the data rate of the incoming signal.
Output data and recovered clock on digital interface: see Figure 5.
End-of-message detection: an EOM consists of two consecutive NRZ ones or zeroes.
Table 6 details some MC33596 features versus DME values.
11.2.2 Manchester Coding Description
The MC33596 data manager is able to decode Manchester-coded messages. For other codings, the data
manager should be disabled (DME=0) for raw data to be available on MOSI.
Table 6.
the MC33596 Features versus DME
DME
Digital Interface Use
Data Format
Output
0
SPI deselected, received data
are directly sent to MOSI
when CONFB = 1
Bit stream
No clock
MOSI
1
SPI master, data sent on
MOSI with clock on SCLK
when CONFB = 1
Data bytes
Recovered clock
MOSI
SCLK
SEB
STROBE
1
0
SCLK
(Output)
MOSI
(Output)
Recovered Clock Updated to Incoming Signal Data Rate
D6 D5 D4 D3 D 2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
0
1
0
CONFB 1
0
D7
D6 D 5 D4 D3 D2 D1
D7
D0
*Refer to
(Section 10) SEB
STROBE
1
0
SCLK
(Output)
MOSI
(Output)
Recovered Clock Updated to Incoming Signal Data Rate
D6 D5 D4 D3 D 2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
1
0
1
0
1
0
CONFB 1
0
D7
D6 D 5 D4 D3 D2 D1
D7
D0
*Refer to
(Section 10)


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