Differences From H8/300 Cpu; Cpu Operating Modes - Hitachi H8/3035 Series Hardware Manual

• Two CPU operating modes
 Normal mode (cannot be used with the H8/3035 Series)
 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. (Normal
mode cannot be used with the H8/3035 Series).
• 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. See figure 2-1.
Only advanced mode can be used with the H8/3035 Series. Unless specified otherwise, all
descriptions in this manual refer to advanced mode.
CPU operating modes
18
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