TDA5230 Datasheet, PDF (50/186 Pages) Infineon Technologies AG – Universal Low Power ASK/FSK Single Conversion Multi-Channel Image-Reject Receiver

TDA523x
Functional Description
2.4.5.8 Run Mode Self Polling
The chip enters Run Mode Self Polling after a successful fulfillment of a wake up
criterion in Self Polling Mode.
The following steps are performed automatically, depending on register settings
• Modulation switching (see Chapter 2.4.5.6 Automatic Modulation Switching)
• Wait for valid TSI (see Chapter 2.4.13 Frame Synchronization)
• Initialize FIFO (see Chapter 2.4.15 Data FIFO) and write data to FIFO
• Scan for MID’s (see Chapter 2.4.14 Message-ID Scanning)
Depending on the interrupt masking, the host micro controller is alerted when
• a data frame has started,
• an MID has been found, (if enabled) or
• EOM (End of Message) has been detected.
See also Chapter 2.4.17 Interrupt Generation Unit
Run Mode Self Polling is left, when synchronization is lost and the Time Out Timer
(TOTIM) has elapsed, and when the mode is switched to SLEEP or Run Mode Slave by
the host microcontroller.
As long as the chip is in Run Mode Self Polling, incoming data frames, even without
additional wake up patterns, can be received and stored.
The data FIFO can be either initialized and cleared at
• Cycle Start, that means whenever Run Mode Self Polling is entered or
• Frame Start, when a TSI has been successfully identified.
Further information about the data FIFO is found in the Chapter 2.4.15 Data FIFO.
Data Sheet
46
Version 4.0, 2007-06-01