16
•
High-speed operation
All frequently-used instructions execute in two to four states
Maximum clock frequency:
18 MHz
8/16/32-bit register-register add/subtract:
111 ns
8
×
8-bit register-register multiply:
778 ns
16
÷
8-bit register-register divide:
778 ns
16
×
16-bit register-register multiply:
1222 ns
32
÷
16-bit register-register divide:
1222 ns
•
Two CPU operating modes
Normal mode (cannot be used with this LSI)
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.