Datasheet

Rev.6.00 Oct.28.2004 page 21 of 1016
REJ09B0138-0600H
Section 2 CPU
2.1 Overview
The H8S/2000 CPU is a high-speed central processing unit with an internal 32-bit architecture that is upward-compatible
with the H8/300 and H8/300H CPUs. The H8S/2000 CPU has sixteen 16-bit general registers, can address a 16-Mbyte
(architecturally 4-Gbyte) linear address space, and is ideal for realtime control.
2.1.1 Features
The H8S/2000 CPU has the following features.
• Upward-compatible with H8/300 and H8/300H CPUs
 Can execute H8/300 and H8/300H object programs
• General-register architecture
 Sixteen 16-bit general registers (also usable as sixteen 8-bit registers or eight 32-bit registers)
• Sixty-five basic instructions
 8/16/32-bit arithmetic and logic instructions
 Multiply and divide instructions
 Powerful bit-manipulation instructions
• Eight addressing modes
 Register direct [Rn]
 Register indirect [@ERn]
 Register indirect with displacement [@(d:16,ERn) or @(d:32,ERn)]
 Register indirect with post-increment or pre-decrement [@ERn+ or @–ERn]
 Absolute address [@aa:8, @aa:16, @aa:24, or @aa:32]
 Immediate [#xx:8, #xx:16, or #xx:32]
 Program-counter relative [@(d:8,PC) or @(d:16,PC)]
 Memory indirect [@@aa:8]
• 16-Mbyte address space
 Program: 16 Mbytes
 Data: 16 Mbytes (architecturally 4-Gbyte)
• High-speed operation
 All frequently-used instructions execute in one or two states
 Maximum clock rate : 20 MHz
 8/16/32-bit register-register add/subtract : 50 ns
 8 × 8-bit register-register multiply : 600 ns
 16 ÷ 8-bit register-register divide : 600 ns
 16 × 16-bit register-register multiply : 1000 ns
 32 ÷ 16-bit register-register divide : 1000 ns
• CPU operating mode
 Advanced mode