Motorola MPC8260 User Manual

MOTOROLA

Chapter 13.  Communications Processor Module Overview  

13-7

The CP has an option to execute microcode from a portion of user RAM located in the dual-
port RAM. In this mode, the CP fetches instructions from both the dual-port RAM and its
own private ROM. This mode allows Motorola to add new protocols or enhancements to
the MPC8260 in the form of RAM microcode packages. If preferred, the user can obtain
binary microcode from Motorola and load it into the dual-port RAM.

The RISC controller conÞguration register (RCCR) conÞgures the CP to run microcode
from ROM or RAM and controls the CPÕs internal timer.

19

SCC2 transmit

20

SCC3 receive 

21

SCC3 transmit

22

SCC4 receive

23

SCC4 transmit

24

IDMA[1Ð4] emulation (option 2)

25

SMC1 receive

26

SMC1 transmit

27

SMC2 receive

28

SMC2 transmit

29

SPI receive

30

SPI transmit

31

I

2

C receive

32

I

2

C transmit

33

RISC timer table

34

IDMA[1Ð4] emulation (option 3)

1

The priority of each IDMA channel is programmed independently. See the 

RCCR[DRxQP] description in Section 13.3.6, ÒRISC Controller ConÞguration 
Register (RCCR).Ó