Overview
The H8S/2646 Group is a series of microcomputers (MCUs: microcomputer units), built around the H8S/2600 CPU, employing Renesas Technology’s proprietary architecture, and equipped with peripheral functions on-chip.

The H8S/2600 CPU has an internal 32-bit architecture, is provided with sixteen 16-bit general registers and a concise, optimized instruction set designed for high-speed operation, and can address a 16-Mbyte linear address space. The instruction set is upward-compatible with H8/300 and H8/300H CPU instructions at the object-code level, facilitating migration from the H8/300, H8/300L, or H8/300H Series.

On-chip peripheral functions required for system configuration include data transfer controller (DTC) bus masters, ROM and RAM memory, a 16-bit timer pulse unit (TPU), programmable pulse generator (PPG), watchdog timer (WDT), serial communication interface (SCI), controller area network (HCAN), A/D converter, motor control PWM timer (PWM), LCD controller/driver (LCDC), and I/O ports.

On-chip ROM is available as 128-kbyte flash memory (F-ZTAT™ version)* or 128/64-kbyte mask ROM. ROM is connected to the CPU via a 16-bit data bus, enabling both byte and word data to be accessed in one state. Instruction fetching has been speeded up, and processing speed increased.
Four operating modes, modes 4 to 7, are provided, and there is a choice of single-chip mode or external expansion mode.