FX929A Datasheet, PDF (33/44 Pages) CML Microcircuits – 4-Level FSK Modem Data Pump

4-Level FSK Modem Data Pump
FX929A
Figures 16a and 16b illustrate the host µC routines needed to receive a single Frame consisting of Symbol and
Frame Sync patterns, a Station ID block, a Header block, any number of Intermediate blocks and one Last
block. It is assumed that the Rx Interrupt Service Routine (Figure 16b) is called whenever the FX929A's IRQN
output line goes low.
Figure 16a Receive Frame Example Flowchart, Main Program
Note that the RESET command in Figure 16a and the practice of disabling the FX929A's IRQN output when not
needed are not essential but can eliminate problems during debugging and if errors occur in operation.
Note also that the CRC bit should be set appropriately whenever a byte is written to the Command Register.
© 1996 Consumer Microcircuits Limited
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D/929A/4