Datasheet

Section 2 CPU

Rev. 3.00 Sep. 28, 2009 Page 15 of 710

REJ09B0384-0300

2.1.2 Differences from H8/300 CPU

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

• More general registers and control registers

⎯ Eight 16-bit extended registers, and one 8-bit and two 32-bit control 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

⎯ Addressing modes of bit-manipulation instructions have been enhanced.

⎯ Signed multiply and divide instructions have been added.

⎯ 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.

2.1.3 Differences from H8/300H CPU

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

• More control registers

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