MPC8280 datasheet(863/1386 Pages) FREESCALE

863 / 1386 page

Serial Management Controllers (SMCs)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

28-9

28.2.4.1

SMC Transmitter Full Sequence

Follow these steps to fully enable or disable the SMC transmitter:

1. If the SMC is sending data, issue a STOP TRANSMIT command to stop transmission smoothly. If the

SMC is not sending, if TBPTR is overwritten, or if an INIT TX PARAMETERS command is executed,

this command is not required.

2. Clear SMCMR[TEN] to disable the SMC transmitter and put it in reset state.

3. Update SMC transmit parameters, including the parameter RAM. To switch protocols or

reinitialize parameters, issue an INIT TX PARAMETERS command.

4. Issue a RESTART TRANSMIT if an INIT TX PARAMETERS was issued in step 3.

5. Set SMCMR[TEN]. Transmission now begins using the TxBD that the TBPTR value pointed to as

soon as the R bit is set in the TxBD.

28.2.4.2

SMC Transmitter Shortcut Sequence

This shorter sequence reinitializes transmit parameters to the state they had after reset.

1. Clear SMCMR[TEN].

2. Issue an INIT TX PARAMETERS command and make any additional changes.

3. Set SMCMR[TEN].

28.2.4.3

SMC Receiver Full Sequence

Follow these steps to fully enable or disable the receiver:

1. Clear SMCMR[REN]. Reception is aborted immediately, which disables the SMC receiver and

puts it in a reset state.

2. Modify SMC receive parameters, including parameter RAM. To switch protocols or reinitialize

SMC receive parameters, issue an INIT RX PARAMETERS command.

3. Issue a CLOSE RXBD command if INIT RX PARAMETERS was not issued in step 2.

4. Set SMCMR[REN]. Reception immediately uses the RxBD that RBPTR pointed to if E is set in

the RxBD.

28.2.4.4

SMC Receiver Shortcut Sequence

This shorter sequence reinitializes receive parameters to their state after reset.

1. Clear SMCMR[REN].

2. Issue an INIT RX PARAMETERS command and make any additional changes.

3. Set SMCMR[REN].

28.2.4.5

Switching Protocols

To switch the protocol that the SMC is executing without resetting the board or affecting any other SMC,

use one command and follow these steps:

1. Clear SMCMR[REN] and SMCMR[TEN].

MPC8280 Datasheet(PDF) 863 Page - Freescale Semiconductor, Inc

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