Section 1 CPU
1.1 Overview
The H8/300H CPU is a high-speed central processing unit with an internal 32-bit architecture that
is upward-compatible with the H8/300 CPU. The H8/300H CPU has sixteen 16-bit general
registers, can address a 16-Mbyte linear address space, and is ideal for realtime control.
1.1.1 Features
The H8/300H CPU has the following features.
•
Upward-compatible with H8/300 CPU
— Can execute H8/300 object programs
•
General-register architecture
— Sixteen 16-bit general registers (also usable as sixteen 8-bit registers or eight 32-bit
registers)
•
Sixty-two 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:24,ERn)]
— Register indirect with post-increment or pre-decrement [@ERn+ or @–ERn]
— Absolute address [@aa:8, @aa:16, or @aa:24]
— 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
•
High-speed operation
— All frequently-used instructions execute in two to four states
— Maximum clock frequency: 16 MHz
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