mc33696fje/r2 Freescale Semiconductor, Inc, mc33696fje/r2 Datasheet - Page 21

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

12.3 Message Protocol
When the strobe oscillator is enabled (SOE = 1), the receiver is continuously on/off cycling. 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.
12.4 Receiver Startup Delay
As shown in
Freescale Semiconductor
Receiver
Receiver
Output
Output
Status
Signal
Signal
Status
SPI
SPI
RF
RF
Figure
On Time
On Time
It is possible to build a tone to form the detection sequence by programming
the ID register with a full sequence of ones or zeroes. In this case, the header
(or its complement) must not be found in this tone (i.e., it must not be a full
sequence of ones or zeroes).
On
On
P+ID
P+ID
12, a settling time is required when entering the on state.
=
P+ID
Figure 11. Complete Telegram with Tone Detection
Preamble
Figure 10. Complete Telegram with ID Detection
Off Time
Off Time
P+ID
Off
Off
ID
MC33696 Data Sheet, Rev. 9
Tone
P+ID
NOTE
P+ID
Detected
Detected
ID
ID
P+ID
P+Header
P+Header
=
On
Header
On
Preamble
Communication Protocol
Data
Data
Data
Data
Header
EOM
EOM
Off
Off
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