Freescale Semiconductor MPC8260 - Manual (Page 920)

Fast Communications Controllers (FCCs)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
29-22 Freescale Semiconductor
2. Issue the INIT RX PARAMETERS command. Any additional changes can be made now.
3. Set GFMR[ENR].
29.12.5 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 TX AND RX 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.
29.13 Saving Power
Clearing an FCC’s ENT and ENR bits minimizes its power consumption.