4 fcc receiver shortcut sequence, 5 switching protocols, 13 saving power – Motorola MPC8260 User Manual

Page 779: Fcc receiver shortcut sequence -21, Switching protocols -21, Saving power -21

MOTOROLA

Chapter 28. Fast Communications Controllers (FCCs)

28-21

Part IV. Communications Processor Module

28.12.4 FCC Receiver Shortcut Sequence

A shorter sequence is possible if the user prefers to reinitialize the receive parameters to the
state they had after reset. This sequence is as follows:

1. Clear GFMR[ENR].

2. Issue the

INIT

PARAMETERS

command. Any additional changes can be made now.

3. Set GFMR[ENR].

28.12.5 Switching Protocols

A user can switch the protocol that the FCC is executing (HDLC) without resetting the
board or affecting any other FCC by taking the following steps:

1. Clear GFMR[ENT] and GFMR[ENR].

2. Issue the

INIT

AND

PARAMETERS

command. This command initializes both

transmit and receive parameters. Additional changes can be made in the GFMR to
change the protocol.

3. Set GFMR[ENT] and GFMR[ENR]. The FCC is enabled with the new protocol.

28.13 Saving Power

Clearing an FCCÕs ENT and ENR bits minimizes its power consumption.