Motorola MPC8260 - Manual (Page 506)

15-16 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
8 GR2 Grant support of SCC2
0 SCC2 transmitter does not support the grant mechanism. The grant is always asserted
internally.
1 SCC2 transmitter supports the grant mechanism as determined by the GMx bit of a serial
device channel.
9 SC2 SCC2 connection
0 SCC2 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 SCC2 is connected to TSA of the SIs. The NMSIx pins are available for other purposes.
10Ð12 RS2CS Receive SCC2 clock source (NMSI mode). Ignored if SCC2 is connected to the TSA (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 CLK11.
101 SCC2 receive clock is CLK12.
110 SCC2 receive clock is CLK3.
111 SCC2 receive clock is CLK4.
13Ð15 TS2CS Transmit SCC2 clock source (NMSI mode). Ignored if SCC2 is connected to the TSA (SC2 = 1).
000 SCC2 transmit clock is BRG1.
001 SCC2 transmit clock is BRG2.
010 SCC2 transmit clock is BRG3.
011 SCC2 transmit clock is BRG4.
100 SCC2 transmit clock is CLK11.
101 SCC2 transmit clock is CLK12.
110 SCC2 transmit clock is CLK3.
111 SCC2 transmit clock is CLK4.
16 GR3 Grant support of SCC3
0 SCC3 transmitter does not support the grant mechanism. The grant is always asserted
internally.
1 SCC3 transmitter supports the grant mechanism as determined by the GMx bit of a serial
device channel.
17 SC3 SCC3 connection
0 SCC3 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 SCC3 is connected to TSA of the SIs. The NMSIx pins are available for other purposes.
18Ð20 RS3CS Receive SCC3 clock source (NMSI mode). Ignored if SCC3 is connected to the TSA (SC3 = 1).
000 SCC3 receive clock is BRG1.
001 SCC3 receive clock is BRG2.
010 SCC3 receive clock is BRG3.
011 SCC3 receive clock is BRG4.
100 SCC3 receive clock is CLK5.
101 SCC3 receive clock is CLK6.
110 SCC3 receive clock is CLK7.
111 SCC3 receive clock is CLK8.
Table 15-6. CMXSCR Field Descriptions (Continued)
Bits Name Description