Datasheet

54
Table 2.8 Addressing Modes and Effective Addresses (cont)
Addressing
Mode
Instruction
Format Effective Addresses Calculation Equation
Indirect indexed
GBR addressing
@(R0, GBR) The effective address is the GBR value plus the R0.
GBR
R0
GBR + R0
+
GBR + R0
PC relative
addressing with
displacement
@(disp:8,
PC)
The effective address is the PC value plus an 8-bit
displacement (disp). The value of disp is zero-
extended, and is doubled for a word operation, and
quadrupled for a longword operation. For a
longword operation, the lowest two bits of the PC
value are masked.
PC
H'FFFFFFFC
PC + disp × 2
or
PC & H'FFFFFFFC

+ disp × 4
+
2/4
×
&
(for longword)
disp
(zero-extended)
Word: PC +
disp × 2
Longword:
PC &
H'FFFFFFFC
+ disp × 4