Renesas R8C/Tiny Series Software Manual page 43

Chapter 2 Addressing Modes
Address register relative
The value indicated by the displace-
dsp:8[A0]
ment (dsp) plus the content of the
dsp:8[A1]
address register (A0/A1)—added
dsp:16[A0]
without the sign bits—is the effective
address for the operation.
dsp:16[A1]
However, if the addition results in a
value exceeding 0FFFF
above are ignored, and the address
returns to 00000
SB relative
The address indicated by the content
dsp:8[SB]
of the static base register (SB) plus
dsp:16[SB]
the value indicated by the displace-
ment (dsp)—added without the sign
bits—is the effective address for the
operation.
However, if the addition results in a
value exceeding 0FFFF
above are ignored, and the address
returns to 00000
FB relative
The address indicated by the content
dsp:8[FB]
of the frame base register (FB) plus
the value indicated by the displace-
ment (dsp)—added including the sign
bits—is the effective address for the
operation.
However, if the addition results in a
value outside the range 00000
0FFFF
ignored, and the address returns to
00000
Rev.2.00 Oct 17, 2005
REJ09B0001-0200
, bits 17 and
16
.
16
, bits 17 and
16
.
16
, bits 17 and above are
16
or 0FFFF .
16 16
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2.3 General Instruction Addressing
Register
A0 / A1
address
Register
SB
address
If the dsp value is negative
Register
FB
address
to
16
If the dsp value is positive
Memory
dsp
Memory
address
dsp
Memory
dsp
address
dsp