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Section 2 CPU
Rev. 6.00 Sep 12, 2006 page 23 of 526
REJ09B0326-0600
2.4 Addressing
Modes
2.4.1 Addressing
Modes
The H8/300L CPU supports the eight addressing modes listed in table 2.1. Each instruction uses a
subset of these addressing modes.
Table 2.1
Addressing Modes
No. Address
Modes
Symbol
1 Register
direct
Rn
2 Register
indirect
@Rn
3
Register indirect with displacement
@(d:16, Rn)
4
Register indirect with post-increment
Register indirect with pre-decrement
@Rn+
@–Rn
5
Absolute address
@aa:8 or @aa:16
6
Immediate
#xx:8 or #xx:16
7
Program-counter relative
@(d:8, PC)
8 Memory
indirect
@@aa:8
1. Register Direct
Rn:
The register field of the instruction specifies an 8- or 16-bit general
register containing the operand.
Only the MOV.W, ADD.W, SUB.W, CMP.W, ADDS, SUBS, MULXU (8 bits
×
8 bits), and
DIVXU (16 bits ÷ 8 bits) instructions have 16-bit operands.
2. Register Indirect
@Rn:
The register field of the instruction specifies a 16-bit general
register containing the address of the operand in memory.
3. Register Indirect with Displacement
@(d:16, Rn):
The instruction has a second word
(bytes 3 and 4) containing a displacement which is added to the contents of the specified
general register to obtain the operand address in memory.
This mode is used only in MOV instructions. For the MOV.W instruction, the resulting
address must be even.
4. Register Indirect with Post-Increment or Pre-Decrement
@Rn+ or @–Rn:
Register indirect with post-increment
@Rn+
The @Rn+ mode is used with MOV instructions that load registers from memory.
The register field of the instruction specifies a 16-bit general register containing the address
of the operand. After the operand is accessed, the register is incremented by 1 for MOV.B
or 2 for MOV.W, and the result of the addition is stored in the register. For MOV.W, the
original contents of the 16-bit general register must be even.
Summary of Contents for F-ZTAT H8/3642A Series
Page 6: ...Rev 6 00 Sep 12 2006 page iv of xx ...
Page 8: ...Rev 6 00 Sep 12 2006 page vi of xx ...
Page 22: ...Rev 6 00 Sep 12 2006 page xx of xx ...
Page 124: ...Section 5 Power Down Modes Rev 6 00 Sep 12 2006 page 102 of 526 REJ09B0326 0600 ...
Page 188: ...Section 6 ROM Rev 6 00 Sep 12 2006 page 166 of 526 REJ09B0326 0600 ...
Page 190: ...Section 7 RAM Rev 6 00 Sep 12 2006 page 168 of 526 REJ09B0326 0600 ...
Page 298: ...Section 9 Timers Rev 6 00 Sep 12 2006 page 276 of 526 REJ09B0326 0600 ...
Page 378: ...Section 12 A D Converter Rev 6 00 Sep 12 2006 page 356 of 526 REJ09B0326 0600 ...
Page 446: ...Section 13 Electrical Characteristics Rev 6 00 Sep 12 2006 page 424 of 526 REJ09B0326 0600 ...