The H8/330 is a single-chip microcomputer with an H8/300 CPU core and a complement of on-chip supporting modules. Avariety of system functions are integrated onto the H8/330 chip.

The H8/300 CPU is a high-speed Hitachi-original processor with an architecture featuring powerful bit-manipulation instructions, ideally suited for realtime control applications. The on-chip supporting modules include 16K bytes of ROM, 512 bytes of RAM, a 16-bit free-runnung timer, two 8-bit timers, two PWM timers, a serial communication interface, an A/D converter, dual-port RAM, and I/O ports.

The H8/330 can operate in single-chip mode or in two expanded modes, depending on the memory requirements of the application. The operating mode is referrd to in this manual as the MCU mode (MCU: MicroComputer Unit).

The H8/330 is available in a masked ROM version, in an electrically programmable ROM version that can be programmed at the user site, or in a version with no ROM. The no-ROM version can be used only in mode 1.