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Section 2 CPU
• High-speed operation
All frequently-used instructions execute in two to four states
Maximum clock frequency:
8/16/32-bit register-register add/subtract: 100 ns
8 × 8-bit register-register multiply:
16 ÷ 8-bit register-register divide:
16 × 16-bit register-register multiply: 1.1 µs
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.
Rev. 4.00 Jan 26, 2006 page 24 of 938
REJ09B0276-0400
20 MHz
700 ns
700 ns
1.1 µs
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