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❍ Direct addressing
Direct addressing instructions are used for access between an I/O and a general-purpose register
or between an I/O and the memory. High-speed and high-efficiency access can be achieved
since an I/O address is directly specified in an instruction instead of using register indirect
addressing. Indirect memory addressing via registers with register incrementing or decrementing
are provided for some instructions.
❍ Other types of instructions
Other types of instructions include instructions that provide flag setting, stack manipulation, sign/
zero extension, and other functions in the PS register. Also, function entry and exit instructions
that support high-level languages and register multi-load/store instructions are provided.
CHAPTER 3 CPU AND CONTROL UNITS
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