Differences From H8/300H Cpu; Cpu Operating Modes - Renesas H8S/2633 Series Hardware Manual

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Differences from H8/300H CPU

In comparison to the H8/300H CPU, the H8S/2600 CPU has the following enhancements.

• Additional control register

 One 8-bit and two 32-bit control registers have been added

• Enhanced instructions

 Addressing modes of bit-manipulation instructions have been enhanced

 A multiply-and-accumulate instruction has been added

 Two-bit shift instructions have been added

 Instructions for saving and restoring multiple registers have been added

 A test and set instruction has been added

• Higher speed

 Basic instructions execute twice as fast

The H8S/2600 CPU has two operating modes: normal and advanced. Normal mode* supports a

maximum 64-kbyte address space. Advanced mode supports a maximum 16-Mbyte total address

space (architecturally a maximum 16-Mbyte program area and a maximum of 4 Gbytes for

program and data areas combined). The mode is selected by the mode pins of the microcontroller.

Note: * Not available in the H8S/2633 Series.

CPU operating modes

Note: * Not available in the H8S/2633 Series.

Normal mode*

Advanced mode

Figure 2-1 CPU Operating Modes

Maximum 64 kbytes, program

and data areas combined

Maximum 16-Mbytes for

program and data areas