r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 102

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 2 CPU
Table 2.12 Absolute Address Access Ranges
Note:
2.7.6
The instruction code contains 8-bit (#xx:8), 16-bit (#xx:16), or 32-bit (#xx:32) immediate data as
an operand.
The ADDS, SUBS, INC, and DEC instructions contain immediate data implicitly. Some bit
manipulation instructions contain 3-bit immediate data in the instruction code, specifying a bit
number. The TRAPA instruction contains 2-bit immediate data in its instruction code, specifying a
vector address.
2.7.7
This mode is used in the Bcc and BSR instructions. An 8-bit or 16-bit displacement contained in
the instruction code is sign-extended and added to the 24-bit PC contents to generate a branch
address. Only the lower 24 bits of this branch address are valid; the upper 8 bits are all assumed to
be 0 (H'00). The PC value to which the displacement is added is the address of the first byte of the
next instruction, so the possible branching range is −126 to +128 bytes (–63 to +64 words) or
−32766 to +32768 bytes (−16383 to +16384 words) from the branch instruction. The resulting
value should be an even number.
2.7.8
This mode can be used by the JMP and JSR instructions. The instruction code contains an 8-bit
absolute address specifying a memory operand. This memory operand contains a branch address.
The upper bits of the absolute address are all assumed to be 0, so the address range is 0 to 255
(H'0000 to H'00FF in normal mode, H'000000 to H'0000FF in advanced mode).
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Absolute Address
Data address
Program instruction
address
*
Immediate—#xx:8 / #xx:16/ #xx:32
Program-Counter Relative—@(d:8, PC) or @(d:16, PC)
Memory Indirect—@@aa:8
Not available in this LSI.
8 bits (@aa:8)
16 bits (@aa:16)
32 bits (@aa:32)
24 bits (@aa:24)
Normal Mode *
H'FF00 to H'FFFF
H'0000 to H'FFFF
Advanced Mode
H'FFFF00 to H'FFFFFF
H'000000 to H'007FFF,
H'FF8000 to H'FFFFFF
H'000000 to H'FFFFFF