Chapter 3: Programming the Peripherals

not go to a continuous level, but is the free running frequency of DCO-R. Since DCO-R is used, program CMR1.DRSS1 and CMR.DRSS0 bits as shown in Table 3-3to select the reference source for the DCO-R circuit

SEC/FSC Configuration

The SEC/FSC signal of the QuadFALC is connected to CPM and is used for the TDM frame synchronization clock (8 KHz synchronization pulse generated by one of the four DCO-R). It must be configured as an FSC output by setting GPC1.CSFP1 to 1. Bit GPC1.CSFP0 allows selecting the active level (low or high). When using the pairing feature, FSC source must match an active channel as for RCLK1: the source is selected with GPC1.FSS1 and GPC1.FSS0 bits.

See Boot Firmware sources: TST\C\QFALC.C Function gvQFalcSetPortSyncSrc.

4538 Hardware Reference Manual

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