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H83887 bảng dữ liệu(PDF) 39 Page - Renesas Technology Corp

tên linh kiện H83887
Giải thích chi tiết về linh kiện  Single-Chip Microcomputer
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H83887 bảng dữ liệu(HTML) 39 Page - Renesas Technology Corp

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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
@Rn+
Register indirect with pre-decrement
@–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.



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