HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 72

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Table 2.12 CPU Instruction Addressing Modes and Effective Addresses (cont)
Addressing
Mode
Indirect
indexed GBR
addressing
PC relative
addressing
with
displacement
54
Instruction
Format
@(R0,
GBR)
@(disp:8,
PC)
Effective Addresses Calculation
The effective address is the GBR value plus the R0
The effective address is the PC value plus an
8-bit displacement (disp). The value of disp is zero-
extended, is doubled for a word operation, and is
quadrupled for a longword operation. For a
longword operation, the lowest two bits of the PC
value are masked
(zero-extended)
H'FFFFFFFC
GBR
R0
disp
PC
2/4
&
(for longword)
+
+
PC&H'FFFFFFFC
GBR + R0
PC + disp
+ disp
or
4
2
Equation
GBR + R0
Word: PC + disp
Longword: PC &
H'FFFFFFFC +
disp
2
4