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7 Cards in this Set
- Front
- Back
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Data Accessing Methods |
Immediate Mode Register Addressing Mode Direct Addressing Mode Indexed Addressing Mode Indirect Addressing Mode Base Pointer Addressing Mode |
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Components of the CPU |
Program Counter Instruction Decoder Data Bus General-Purpose Register Arithmetic and Logic Unit |
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What does the program counter do? |
Tells the computer where to fetch the next instruction from it contains the 'memory address' of the next instruction. The CPU begins by looking at the program counter and fetching whatever number is stored in the location specified. |
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What is the Data Bus?
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The connection between CPU and memory |
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What does the Instruction Decoder do?
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Decodes instructions returned from memory located at address specified by the program counter. Instructions usually include the process that needs to take place and the memory addresses of the "operands" (paraphrased). |
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Address and Byte |
Computer memory is a numbered sequence of fixed-size storage locations. The number attached to each location is called its address. The size of a single location is called a byte. |
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Word Size
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The size of a typical register.
x86 processors have 4 byte words. 4 bytes = 1 word. It is most natural for these computers to do calculations 4 bytes at a time. (They used to use 2 byte words, so 4 byte words were called "double words." |
