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Chapter 2 CPU Basics
II - 10
Overview
2-1-8 Addressing Modes
The MN101C77G series supports the nine addressing modes.
Each instruction uses a combination of the following addressing modes.
1) Register direct
2) Immediate
3) Register indirect
4) Register relative indirect
5) Stack relative indirect
6) Absolute
7) RAM short
8) I/O short
9) Handy
These addressing modes are well-suited for C language compilers. All of the addressing modes can be
used for data transfer instructions. In modes that allow half-byte addressing, the relative value can be
specified in half-byte (4-bit) increments, so that instruction length can be shorter. Handy addressing
reuses the last memory address accessed and is only available with the MOV and MOVW instructions.
Combining handy addresssing with absolute addressing reduces code size. For transfer data between
memory, 7 addressing modes ; register indirect, register relative indirect, stack relative indirect, abso-
lute, RAM short, I/O short, handy can be used. For operation instruction, register direct and immediate
can be used. Refer to instruction's manual for the MN101C series.
This LSI is designed for 8-bit data access. It is possible to tranfer data in 16-bit increments
with odd or all even addresses.