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23
Chapter 2 Addressing Modes
2.2 Guide to This Chapter
The following shows how to read this chapter using an actual example.
Address register relative
dsp:8[A0]
dsp:8[A1]
dsp:16[A0]
dsp:16[A1]
Memory
A0 / A1
Register
address
dsp
(1) Name
Indicates the name of addressing.
(2) Symbol
Represents the addressing mode.
(3) Explanation
Describes the addressing operation and the effective address range.
(4) Operation diagram
Diagrammatically explains the addressing operation.
(2)
(1)
(3)
(4)
2.2 Guide to This Chapter
The value indicated by displacement
(dsp) plus the content of address
register (A0/A1)added not includ-
ing the sign bitsconstitutes the
effective address to be operated on.
However, if the addition resulted in
exceeding 0FFFF16, the bits above
bit 17 are ignored, and the address
returns to 0000016.
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