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MC33596 Datasheet(PDF) 17 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) 17 Page - Freescale Semiconductor, Inc

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11.2.3.3 HEADER
The HEADER defines the beginning of the message, as it is compared with the HEADER register. Its
length is variable, defined by the HDL[1:0] bits. The complement of the header is also recognized as the
header—in this case, output data is complemented. The header and its complement should not be part of
the ID.
The ID and the header are sent at the same data rate as data.
11.2.3.4 Data and EOM
The data must follow the header, with no delay.
The message is completed with an end-of-message (EOM), consisting of two consecutive NRZ ones or
zeroes (i.e., a Manchester code violation). Even in the case of FSK modulation, data must conclude with
an EOM, and not simply by stopping the RF transmission.
11.2.4 State Machine in Receive Mode When DME=1
When the strobe oscillator is enabled (SOE = 1), the receiver is continuously cycling on/off. The ID must
be recognized for the receiver to stay on. Consequently, the transmitted ID burst must be long enough to
include two consecutive receiver-on cycles.
When the strobe oscillator is not enabled (SOE = 0), these timing constraints must be respected by the
external control applied to pin STROBE.
Figure 11 shows the correct detection of an ID when STROBE is controled internally using the strobe
oscillator (SOE=1) or externally by the MCU (SOE=0).
Figure 10. Complete Transmission with ID Detection
Two different processes are possible, as determined by the values of the SOE bit.
11.2.4.1 Data Manager Enabled and Strobe Oscillator Enabled
Figure 11 shows the state diagram when the data manager and the strobe oscillator are enabled. In this
configuration, the receiver is controlled internally by the strobe oscillator. However, external control via
the STROBE pin is still possible, and overrides the strobe oscillator command.
RF
Signal
Receiver
Status
SPI
Output
Preamble
ID
ID
ID
ID
ID
Header
Data
EOM
Data
On
On Time
Off
Off Time
ID
Detected
On
Off
ID
ID
ID Field
RF
Signal
Receiver
Status
SPI
Output
Preamble
ID
ID
ID
ID
ID
Header
Data
EOM
Data
On
On Time
Off
Off Time
ID
Detected
On
Off
ID
ID
ID Field


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