mc33696fje/r2 Freescale Semiconductor, Inc, mc33696fje/r2 Datasheet - Page 22

• Manufacturer Part Number: mc33696fje/r2
• Description: Mc33696 Pll Tuned Uhf Transceiver
• Manufacturer: Freescale Semiconductor, Inc

Data Manager
13
In receive mode, Manchester coded data can be processed internally by the data manager. After decoding,
the data are output on the digital interface, in SPI format. This minimizes the load on the MCU.
The data manager, when enabled (DME = 1), has five purposes:
Table 8
14
In receive mode, on/off sequencing can be controlled internally, or managed externally by the MCU
through the input pin STROBE.
If the internal timer is selected (SOE = 1),
22
Receiver
Status
Signal
•
•
•
•
•
•
•
RF
ID detection: The received identifier is compared with the identifier stored in the ID register.
Header recognition: The received header is compared with the one stored in the HEADER
register.
Clock recovery: The clock is recovered during reception of the preamble and is computed from
the shortest received pulse. During the reception of the telegram, the recovered clock is constantly
updated to the data rate of the incoming signal.
Output data and recovered clock on digital interface: See
End-of-message detection: An EOM consists of two consecutive NRZ ones or zeroes.
Off time is clocked by the strobe oscillator,
On time is clocked by the crystal oscillator, enabling accurate control of the on time and,
therefore, the current consumption of the whole system.
details some MC33696 features versus DME values.
Data Manager
Receiver On/Off Control
Off
DME
0
1
On
Table 8.
Digital Interface Use
when CONFB = 1
SPI deselected
Figure 12. Receiver Usable Window
SPI master
the
MC33696 Data Sheet, Rev. 9
MC33696 Features versus DME
ID
Off
ID
Recovered clock
Data Format
Data bytes
Bit stream
ID
No clock
Section 15.2, “Receive
Settling
Time
ID
Detected
Output
ID
SCLK
MOSI
MOSI
—
ID
ID
Freescale Semiconductor
Mode.”
ID
On
ID