Motorola PowerQUICC II MPC8280 Series Reference Manual page 1378

Handling Interrupts in the SPI
39.10 Handling Interrupts in the SPI
The following sequence should be followed to handle interrupts in the SPI:
1. Once an interrupt occurs, read SPIE to determine the interrupt source. Normally,
SPIE bits should be cleared at this time.
2. Process the TxBD to reuse it and the RxBD to extract the data from it. To transmit
another buffer, simply set TxBD[R], RxBD[E], and SPCOM[STR].
3. Execute an rfi instruction.
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