HD64F3039F18 Datasheet, PDF (67/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 2 CPU
4. Register Indirect with Post-Increment or Pre-Decrement—@ERn+ or @–ERn
• Register indirect with post-increment—@ERn+
The register field of the instruction code specifies an address register (ERn) the lower 24 bits
of which contain the address of a memory operand. After the operand is accessed, 1, 2, or 4 is
added to the address register contents (32 bits) and the sum is stored in the address register.
The value added is 1 for byte access, 2 for word access, or 4 for longword access. For word or
longword access, the register value should be even.
• Register indirect with pre-decrement—@–ERn
The value 1, 2, or 4 is subtracted from an address register (ERn) specified by the register field
in the instruction code, and the lower 24 bits of the result become the address of a memory
operand. The result is also stored in the address register. The value subtracted is 1 for byte
access, 2 for word access, or 4 for longword access. For word or longword access, the resulting
register value should be even.
5. Absolute Address—@aa:8, @aa:16, or @aa:24
The instruction code contains the absolute address of a memory operand. The absolute address
may be 8 bits long (@aa:8), 16 bits long (@aa:16), or 24 bits long (@aa:24). For an 8-bit absolute
address, the upper 16 bits are all assumed to be 1 (H'FFFF). For a 16-bit absolute address the
upper 8 bits are a sign extension. A 24-bit absolute address can access the entire address space.
Table 2.12 indicates the accessible address ranges.
Table 2.12 Absolute Address Access Ranges
Absolute
Address
1-Mbyte Modes
16-Mbyte Modes
8 bits (@aa:8)
H'FFF00 to H'FFFFF
(1,048,320 to 1,048,575)
H'FFFF00 to H'FFFFFF
(16,776,960 to 16,777,215)
16 bits (@aa:16) H'00000 to H'07FFF,
H'000000 to H'007FFF,
H'F8000 to H'FFFFF
H'FF8000 to H'FFFFFF
(0 to 32,767, 1,015,808 to 1,048,575) (0 to 32,767, 16,744,448 to 16,777,215)
24 bits (@aa:24) H'00000 to H'FFFFF
(0 to 1,048,575)
H'000000 to H'FFFFFF
(0 to 16,777,215)
Rev.3.00 Mar. 26, 2007 Page 43 of 682
REJ09B0353-0300