Difference between revisions of "Instructions"
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The data to be used by the OpCode, this can be data eg #21 (ie the number 21) or it can be an address eg 21 (ie memory location 21) | The data to be used by the OpCode, this can be data eg #21 (ie the number 21) or it can be an address eg 21 (ie memory location 21) | ||
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| + | ==Addressing== | ||
| + | <youtube>https://www.youtube.com/watch?v=yKNrFfVdu3g&list=PLCiOXwirraUDUYF_qDYcZV8Hce8dsE_Ho&index=120</youtube> | ||
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| + | https://www.youtube.com/watch?v=yKNrFfVdu3g&list=PLCiOXwirraUDUYF_qDYcZV8Hce8dsE_Ho&index=120 | ||
===Immediate Addressing=== | ===Immediate Addressing=== | ||
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===Direct Addressing=== | ===Direct Addressing=== | ||
The operand is a location eg 21 | The operand is a location eg 21 | ||
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| + | ===Indirect Addressing - not in AQA Specification=== | ||
| + | The operand is a location which contains the location for the instruction | ||
| + | |||
| + | ===Index Addressing - not in AQA Specification=== | ||
| + | The operand is the number in the Index Regisiter after the location in the instruction | ||
Revision as of 15:15, 10 June 2018
Contents
Overview
https://www.youtube.com/watch?v=2h3hQCV3YcE&index=117&list=PLCiOXwirraUDUYF_qDYcZV8Hce8dsE_Ho
OpCode
The command for the instruction, ie Load, Store, Add
Operand
The data to be used by the OpCode, this can be data eg #21 (ie the number 21) or it can be an address eg 21 (ie memory location 21)
Addressing
https://www.youtube.com/watch?v=yKNrFfVdu3g&list=PLCiOXwirraUDUYF_qDYcZV8Hce8dsE_Ho&index=120
Immediate Addressing
The operand is data eg #21
Direct Addressing
The operand is a location eg 21
Indirect Addressing - not in AQA Specification
The operand is a location which contains the location for the instruction
Index Addressing - not in AQA Specification
The operand is the number in the Index Regisiter after the location in the instruction
