Motorola MPC8260 User Manual

MOTOROLA

Chapter  15.  CPM Multiplexing  

15-17

The CMX SMC clock route register (CMXSMR) deÞnes the connection of the SMCs to the
TSA and to the clock sources from the bank of clocks.

21Ð23 TS3CS

Transmit SCC3 clock source (NMSI mode). Ignored if SCC3 is connected to the TSA (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 CLK5.
101 SCC3 transmit clock is CLK6.
110 SCC3 transmit clock is CLK7.
111 SCC3 transmit clock is CLK8.

24

GR4

Grant support of SCC4
0 SCC4 transmitter does not support the grant mechanism. The grant is always asserted 

internally.

1 SCC4 transmitter supports the grant mechanism as determined by the GMx bit of a serial 

device channel.

25

SC4

SCC4 connection
0 SCC4 is not connected to the TSA and is either connected directly to the NMSIx pins or is not 

used. The choice of general-purpose I/O port pins versus SCCn pins is made in the parallel I/O 
control register.

1 SCC4 is connected to TSA of the SIs. The NMSIx pins are available for other purposes.

26Ð28 RS4CS

Receive SCC4 clock source (NMSI mode). Ignored if SCC4 is connected to the TSA (SC4 = 1).
000 SCC4 receive clock is BRG1.
001 SCC4 receive clock is BRG2.
010 SCC4 receive clock is BRG3.
011 SCC4 receive clock is BRG4.
100 SCC4 receive clock is CLK5.
101 SCC4 receive clock is CLK6.
110 SCC4 receive clock is CLK7.
111 SCC4 receive clock is CLK8

29Ð31 TS4CS

Transmit SCC4 clock source (NMSI mode). Ignored if SCC4 is connected to the TSA (SC4 = 1).
000 SCC4 transmit clock is BRG1.
001 SCC4 transmit clock is BRG2.
010 SCC4 transmit clock is BRG3.
011 SCC4 transmit clock is BRG4.
100 SCC4 transmit clock is CLK5.
101 SCC4 transmit clock is CLK6.
110 SCC4 transmit clock is CLK7.
111 SCC4 transmit clock is CLK8