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CPU210A_020020040200 Rev. 1.00, 05/04, page 13 of 544
Section 2 CPU
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 linear address space, and is ideal for realtime control.
This section describes the H8S/2000 CPU. The usable modes and address spaces differ depending
on the product. For details on each product, refer to section 3, MCU Operating Modes.
2.1 Features
• Upward-compatibility with H8/300 and H8/300H CPUs
Can execute H8/300 CPU and H8/300H CPU 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
• High-speed operation
All frequently-used instructions are executed in one or two states
8/16/32-bit register-register add/subtract: 1 state
8 × 8-bit register-register multiply: 12 states (MULXU.B), 13 states (MULXS.B)
16 ÷ 8-bit register-register divide: 12 states (DIVXU.B)
16 × 16-bit register-register multiply: 20 states (MULXU.W), 21 states (MULXS.W)
32 ÷ 16-bit register-register divide: 20 states (DIVXU.W)