38116423
Description
Flashcards by Malachy Moran-Tun, updated more than 1 year ago
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Created by Malachy Moran-Tun
over 1 year ago
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| Question | Answer |
| What are the 4 types of Memory Addressing Modes? | > Immediate > Direct > Indirect > Indexed |
| What is Immediate Addressing? | > Opcode is the actual value to be used (i.e., the CPU does not use RAM at all to get the value) > The CPU does not need to access another memory location as the data has already been given to it |
| What is Direct Addressing? | > Opcode is the address for the memory location where the actual data can be found > The CPU has to retrieve the value from the given memory location > LMC uses direct addressing |
| What is Indirect Addressing? | > Opcode is the location of the value to be used (usually a register) > This allows the CPU to access a higher number of locations, as it is not limited to the maximum value of the opcode, which is usually a small number of bits |
| What is Indexed Addressing? | > Opcode is one value added with another value stored in the index register > This final added value gives the memory location of the data to be used > Index register is a constant value - it represents the first memory location of an array of data |
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