— 8/16/32-bit register-register add/subtract: 125 ns
— 8
×
8-bit register-register multiply: 875 ns
— 16 ÷ 8-bit register-register divide: 875 ns
— 16
×
16-bit register-register multiply: 1375 ns
— 32 ÷ 16-bit register-register divide: 1375 ns
•
Two CPU operating modes
— Normal mode
— Advanced mode
•
Low-power mode
— Transition to power-down state by SLEEP instruction
1.1.2 Differences from H8/300 CPU
In comparison to the H8/300 CPU, the H8/300H CPU has the following enhancements.
•
More general registers
Eight 16-bit registers have been added.
•
Expanded address space
Normal mode supports the same 64-kbyte address space as the H8/300 CPU.
Advanced mode supports a maximum 16-Mbyte address space.
•
Enhanced addressing
The addressing modes have been enhanced to make effective use of the 16-Mbyte address
space.
•
Enhanced instructions
Signed multiply/divide instructions and other instructions have been added.
2