Datasheet

299
XMEGA B [DATASHEET]
8291B–AVR–01/2013
performed not only on communication data, but also on data in SRAM or I/O memory by passing these data through a
DMA channel. If the latter is done, the destination register for the DMA data can be the data input (DATAIN) register in
the CRC module.
24.6 CRC using the I/O Interface
CRC can be performed on any data by loading them into the CRC module using the CPU and writing the data to the
DATAIN register. Using this method, an arbitrary number of bytes can be written to the register by the CPU, and CRC is
done continuously for each byte. New data can be written for each cycle. The CRC complete is signaled by writing the
BUSY bit in the STATUS register.