MC33696MOD868EV Freescale Semiconductor, MC33696MOD868EV Datasheet - Page 16

• Manufacturer Part Number: MC33696MOD868EV
• Description: MCU, MPU & DSP Development Tools MC33696 (ECHO) RF C EVAL
• Manufacturer: Freescale Semiconductor

Specifications of MC33696MOD868EV

• Processor To Be Evaluated: MC9S08RG60
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Receive Mode
DME = 0: The data manager is disabled. The SPI is deselected. Raw data is sent directly on the MOSI line,
while SCLK remains at the low level.
Manchester coding is defined as follows: data is sent during the first half-bit; and the complement of the
data is sent during the second half-bit. The signal average value is constant.
Clock recovery can be extracted from the data stream itself. To achieve correct clock recovery,
Manchester-coded data must have a duty cycle between 47% and 53%.
12.2.3 Frame Format
A complete telegram includes the following sequences: a preamble, an identifier (ID), a header, the
message, and an end-of-message (EOM).
These bit sequences are described below.
12.2.3.1 Preamble
A preamble is required before the first ID detected. It enables:
No preamble is needed in case of several IDs are sent as shown in
than two IDs. The first ID will have the same function as the preamble, and the second ID will have the
same function as the single ID.
For both cases, the preamble content must be defined carefully, to ensure that it will not be decoded as the
ID or the header.
16
— In the case of OOK modulation, the AGC to settle, and the data slicer reference voltage to
— In the case of FSK modulation, the data slicer reference voltage to settle
— The data manager to start clock recovery
PREAMBLE
PREAMBLE
...
...
settle if DSREF = 1
ID ID
ID ID
Figure 9
Figure 8. Example of Frame with Several IDs, No Preamble Needed
defines the different preamble in OOK and FSK modulation.
ID
ID
ID
ID
0
Figure 6. Example of Manchester Coding
ID ID ID HEADER
ID ID ID HEADER
ID ID ID HEADER
ID ID ID HEADER
Figure 7. Example of Frame Format
1
MC33696 Data Sheet, Rev. 12
0
0
1
1
0
ORIGINAL
DATA
MANCHESTER
CODED DATA
DATA …………
DATA …………
Figure
DATA …………
DATA …………
8. The ID field must be greater
Freescale Semiconductor
EOM
EOM