In Tutorial 26 the core was the only thing on the bus. Every byte that moved, the core moved, one load and one store at a time. A DMA engine (direct memory access) is a second master: the core writes ...

A CPU keeps the values it is working on in a small set of fast registers. An instruction such as ADD R1, R2 reads two of them and writes one back, all in a single clock. The hardware that does this is ...