Datasheet

Section 2 CPU

Rev. 4.00 Jun 06, 2006 page 27 of 1004

REJ09B0301-0400

2.1.3 Differences from H8/300 CPU

In comparison to the H8/300 CPU, the H8S/2000 CPU has the following enhancements.

• More general registers and control registers

 Eight 16-bit extended registers, and one 8-bit control register, 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.

 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.

2.1.4 Differences from H8/300H CPU

In comparison to the H8/300H CPU, the H8S/2000 CPU has the following enhancements.

• Additional control register