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CHAPTER 3 CPU AND CONTROL UNITS
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Direct addressing
The direct addressing instructions are used for access between an I/O and either a general-purpose register
or memory. This group of instructions enables fast and efficient access by directly addressing the address of
the I/O in the instruction instead of indirect addressing using a register. Some of these instructions support
register-indirect memory addressing with register increment/decrement as well.
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Other
This group of instructions includes those for PS register flag setting, stack manipulation, sign/zero
extension. It also includes the function entrance/exit applicable to high-level languages and register multi-
load/store instructions.
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