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Chapter 2 CPU Basics
Overview
Table 2-1-4 Addressing Modes
Addressing mode Effective address Explanation
Register direct
Immediate
Register indirect
Register relative
indirect
(d7, PC)
(d8, An)
(An)
imm4/imm8
imm16
Dn/DWn
An/SP
PSW
0
0
0
0 H
(d16, An)
(branch instructions only)
An
An+d8
An+d16
PC+d7
Directly specifies the register. Only internal
registers can be specified.
Directly specifies the operand or mask
value appended to the instruction code.
Specifies the address using an address
register.
Specifies the address using an address
register with 8-bit displacement.
Specifies the address using an address
register with 16-bit displacement.
Specifies the address using the program
counter with 7-bit displacement and H bit.
17
15
15
15
(d4, PC)
(branch instructions only)
(d16, PC)
(branch instructions only)
Stack relative
indirect
(d4, SP)
(d8, SP)
Specifies the address using the program
counter with 4-bit displacement and H bit.
Specifies the address using the program
counter with 16-bit displacement and H bit.
0 H
PC+d4
17
0 H
PC+d16
17
0
SP+d4
15
0
SP+d8
15
Specifies the address using the stack
pointer with 4-bit displacement.
Specifies the address using the stack
pointer with 8-bit displacement.
Absolute
Handy
(abs16)
0
abs16
Specifies the address using the operand
value appended to the instruction code.
Optimum operand length can be used to
specify the address.
15
Reuses the last memory address accessed
and is only available with the MOV and
MOVW instructions. Combined use with
absolute addressing reduces code size.
0
abs12
11
0
abs8
7
(abs12)
(abs8)
I/O short
Specifies an 8-bit offset from the top address
(x'03F00') of the special function register area.
0
IOTOP+io8
15
(io8)
(HA)
(d16, SP)
0
SP+d16
15
Specifies the address using the stack
pointer with 16-bit displacement.
(abs18)
0 H
abs18
17
(branch instructions only)
(d11, PC)
0 H
(branch instructions only)
PC+d11
Specifies the address using the program
counter with 11-bit displacement and H bit.
17
(d12, PC)
0 H
(branch instructions only)
PC+d12
Specifies the address using the program
counter with 12-bit displacement and H bit.
17
RAM short
(abs8)
0
abs8
7
Specifies an 8-bit offset from the address
x'00000'.
* 1
* 1
* 1
* 1
* 1
* 1
* 1
H: half-byte bit
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