Destination Count Reload

A DMA message is considered to be complete when the Destination Count register is decremented from 1 and then reloaded (i.e., once the last byte from either the source read or destination write has occurred). When the DSTP bit is set and the Destination Count register is reloaded then further message transfer is stopped.

Important: Reading the DMAnSCNT or DMAnDCNT registers will never return zero. When either register is decremented from ‘1’, it is immediately reloaded from the corresponding size register.