Differences From H8/300 Cpu - Hitachi H8/3032 Series Hardware Manual

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2.1.2 Differences from H8/300 CPU

In comparison to the H8/300 CPU, the H8/300H has the following enhancements.
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High-speed operation
— All frequently-used instructions execute in two to four states
— Maximum clock frequency:
— 8/16/32-bit register-register add/subtract: 125 ns
— 8 × 8-bit register-register multiply:
— 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
More general registers
Eight 16-bit registers have been added.
Expanded address space
— Advanced mode supports a maximum 1-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 1-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.
16 MHz
875 ns
875 ns
1.375 µs
1.375 µs
16