Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A device control register (DCR) is a register that resides in an element of a System-on-a-chip (e.g. a memory unit, a DMA controller, other bus controller, a timer etc.) and allows to configure, control and probe this element. Typically, a microprocessor or a processor core is the entity that initiates these tasks, thus a master-slave configuration is created. Communications between the master (the processor) and the slaves (other on-chip elements or peripheral devices) are carried out using a specialized bus with its own address space and means of access.

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