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16 ÷ 8-bit register-register divide:
16 × 16-bit register-register multiply:
32 ÷ 16-bit register-register divide:
• Two CPU operating modes
Normal mode
Advanced mode
• Low-power mode
Transition to power-down state by SLEEP instruction
2.1.2
Differences from H8/300 CPU
In comparison to the H8/300 CPU, the H8/300H has the following enhancements.
• More general registers
Eight 16-bit registers have been added.
• Expanded address space
Advanced mode supports a maximum 16-Mbyte address space.
Normal mode supports the same 64-kbyte address space as the H8/300 CPU.
• Enhanced addressing
The addressing modes have been enhanced to make effective use of the 16-Mbyte address
space.
• Enhanced instructions
Data transfer, arithmetic, and logic instructions can operate on 32-bit data.
Signed multiply/divide instructions and other instructions have been added.
2.2
CPU Operating Modes
The H8/300H CPU has two operating modes: normal and advanced. Normal mode supports a
maximum 64-kbyte address space. Advanced mode supports up to 16 Mbytes.
CPU operating modes
28
700 ns@20 MHz (560 ns@25 MHz)
1.1 µs@20 MHz (0.88 µs@25 MHz)
1.1 µs@20 MHz (0.88 µs@25 MHz)
Normal mode
Advanced mode
Figure 2.1 CPU Operating Modes
Maximum 64 kbytes, program
and data areas combined
Maximum 16 Mbytes, program
and data areas combined
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