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Instruction Register: Difference between revisions
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The '''Instruction Register''' (IR) exists on the [[65c816]]. It is 8 bits wide and contains the opcode just fetched from memory. It is not accessible to the programmer. | The '''Instruction Register''' (IR) exists on the [[65c816]]. It is 8 bits wide and contains the opcode just fetched from memory. It is not accessible to the programmer. | ||
It is connected to the data latch/predecoder and instruction decode minterms. | |||
=== References === | === References === | ||
Revision as of 00:04, 23 July 2024
The Instruction Register (IR) exists on the 65c816. It is 8 bits wide and contains the opcode just fetched from memory. It is not accessible to the programmer.
It is connected to the data latch/predecoder and instruction decode minterms.
References
- Labiak page 39, https://archive.org/details/Programming_the_65816/page/n49
- section 2.1 on page 6 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf