Motorola MPC823e Reference Manual page 592

Communication Processor Module
R2CS—Receive Clock Source for SCC2
This field is ignored when the SCC2 is connected to the time-slot assigner (SC2 = 1).
000 = SCC2 receive clock is BRG1.
001 = SCC2 receive clock is BRG2.
010 = SCC2 receive clock is BRG3.
011 = SCC2 receive clock is BRG4.
100 = SCC2 receive clock is CLK1.
101 = SCC2 receive clock is CLK2 .
110 = SCC2 receive clock is CLK3 .
111 = SCC2 receive clock is CLK4 .
T2CS—Transmit Clock Source for SCC3
This field is ignored when SCC3 is connected to the time-slot assigner (SC3 = 1).
000 = SCC3 transmit clock is BRG1.
001 = SCC3 transmit clock is BRG2.
010 = SCC3 transmit clock is BRG3.
011 = SCC3 transmit clock is BRG4.
100 = SCC3 transmit clock is CLK1.
101 = SCC3 transmit clock is CLK2.
110 = SCC3 transmit clock is CLK3.
111 = SCC3 transmit clock is CLK4.
Bits 24–25—Reserved
These bits are reserved and must be set to 0.
R1CS—Clock Source for the USB
000 = USB clock is BRG1.
001 = USB clock is BRG2.
010 = USB clock is BRG3.
011 = USB clock is BRG4.
100 = USB clock is CLK1.
101 = USB clock is CLK2.
110 = USB clock is CLK3.
111 = USB clock is CLK4.
Bits 29–31—Reserved
These bits are reserved and must be set to 0.
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