MC33596_09 Datasheet, PDF (20/70 Pages) Freescale Semiconductor, Inc – PLL Tuned UHF Receiver for Data Transfer Applications

Receive Mode
SPI Master
SPI Deselected
STROBE = 0
STROBE = 0
State 20
Standby/LVD
STROBE = 1
State 21
On
Waiting For a Valid ID
ID Detected
STROBE = 1
STROBE = 0
State 22
On
Waiting for a Valid Header
Header Received
EOM Received
and STROBE = 1
State 23
On
Output Data and Clock
Waiting for End of Message
EOM Received
and STROBE = 0
Figure 12. Receive Mode, DME = 1, SOE = 0
• State 20:
The receiver is in standby/LVD mode. For further information, see Section 12, “Standby: LVD
Mode.” A high level applied to STROBE forces the circuit to state 21.
• State 21:
The circuit is waiting for a valid ID. If an ID, or its complement, is detected, the state machine
advances to state 22; if not, the state machine will remain in state 21, as long as STROBE is high.
• State 22:
If a header, or its complement, is detected, the state machine advances to state 23. If not, the state
machine will remain in state 22, as long as STROBE is high.
• State 23:
A header or its complement has been received; data and clock signals are output on the SPI port
until an EOM indicates the end of the data sequence. If the complement of the header has been
MC33596 Data Sheet, Rev. 4
20
Freescale Semiconductor