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Section 1 Overview
1.1 Overview
The H8/3022 Series comprises microcomputers (MCUs) that integrate system supporting
functions together with an H8/300H CPU core featuring an original Hitachi architecture.
The H8/300H CPU has a 32-bit internal architecture with sixteen 16-bit general registers, and a
concise, optimized instruction set designed for speed. It can address a 16-Mbyte linear address
space. Its instruction set is upward-compatible at the object-code level with the H8/300 CPU,
enabling easy porting of software from the H8/300 Series.
The on-chip system supporting functions include ROM, RAM, a 16-bit integrated timer unit
(ITU), a programmable timing pattern controller (TPC), a watchdog timer (WDT), a serial
communication interface (SCI), an A/D converter, I/O ports, and other facilities.
The H8/3022 Series consists of four models: the H8/3022 with 256 kbytes of ROM and 8 kbytes
of RAM, the H8/3021 with 192 kbytes of ROM and 8 kbytes of RAM, and the H8/3020 with 128
kbytes of ROM and 4 kbytes of RAM.
The five MCU operating modes offer a choice of expanded mode, single-chip mode and address
space size.
TM
In addition to the masked-ROM version of the H8/3022 Series, an F-ZTAT
* version with an on-
chip flash memory that can be freely programmed and reprogrammed by the user after the board is
installed is also available. This version enables users to respond quickly and flexibly to changing
application specifications, growing production volumes, and other conditions.
Table 1-1 summarizes the features of the H8/3022 Series.
Note: * F-ZTAT (Flexible ZTAT) is a trademark of Hitachi, Ltd.
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