The control unit provides several functions:- it fetches, ____ and executes ____ - it issues ____ signals that control ____ - it moves ____ around the system The arithmetic logic unit has two main functions:- It performs ____ and ____ operations (decisions). The ____ is where calculations are done and where ____ are made.- It acts as a gateway between primary memory and secondary storage . Data transferred between them passes through the ALU. ____ are small amounts of ____ memory contained within the ____. They are used by the ____ to store small amounts of ____ that are needed during processing, such as:- the ____ of the next instruction to be executed- the current instruction being decoded - the results of calculations Different ____ have different numbers of ____ for different purposes, but most have some, or all, of the following:- ____ counter - memory address register ____ - memory data register ____ - current instruction register ____ - accumulator ____ ____ is a small amount of ____ random access memory ____ built directly within the ____. It is used to temporarily hold ____ and ____ that the processor is likely to reuse. This allows for ____ processing as the processor does not have to wait for the data and instructions to be fetched from the RAM. The ____ contains a ____ which is used to ____ all of the computer's components. The clock sends out a regular ____ pulse which ____ (keeps in time) all the components.The ____ of the pulses is known as the clock ____. Clock speed is measured in ____. The ____ the frequency, the more ____ can be performed in any given moment of time. In the 1980s, processors commonly ran at a rate of between 3 megahertz (MHz) to 5 MHz, which is 3 million to 5 million pulses or cycles per second. Today, ____ commonly run at a rate of 3 gigahertz (GHz) to 5 GHz, which is ____ billion to 5 ____ pulses or cycles per second. A ____ is a ____ internal ____. Buses are used to send ____ signals and ____ between the processor and other components.____ types of bus are used: 1) ____ bus - carries ____ addresses from the processor to other components such as ____ memory and ____ devices. 2) Data bus - carries the actual data between the ____ and other components. 3) Control bus - carries control ____ from the processor to other components. The control bus also carries the ____ pulses.

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