Misplaced Pages

Some of this article's listed sources may not be reliable. Please help improve this article by looking for better, more reliable sources. Unreliable citations may be challenged and removed. (October 2020) (Learn how and when to remove this message)

Hitachi H8/323

The Hitachi H8 is a large family of 8-bit, 16-bit and 32-bit microcontrollers made by Renesas Technology, originating in the early 1990s within Hitachi Semiconductor. The original design, the H8/300, was an 8-bit processor that had a 16-bit registers and ALU that allowed some 16-bit operations. Two upgraded versions were introduced, the H8/300L that expanded the instructions to become a full 16-bit machine while being optimized for low cost, and the H8/300H which further expanded the registers to allow 32-bit operations and was optimized for low-power/high-performance roles. Many variations exist.

The entire line was sold to Renesas in 2003. Renesas continues to sell the designs as of 2023, but only to existing customers. An administrator on the Renesas user community boards commented in 2011 that there are no plans for further development of H8 based products. H8 was supported in the Linux kernel starting with version 4.2 but support was removed in version 5.19.

For higher performance needs, Hitachi introduced its SuperH family of 32-bit RISC-like microcontrollers, which have largely replaced the H8.

Variants

Subfamilies include the 8/16-bit H8/300 and H8/500, the 16/32-bit H8/300H and H8S and the 32-bit H8SX series, each with dozens of different variants, varying by speed, selection of built-in peripherals such as timers, interrupts and serial ports, and amounts of ROM, flash memory and RAM. Built-in ROM and flash memory tends to range from 16 KB to 1024 KB, and RAM from 512 B to 512 KB.

The basic architecture of the H8 is patterned after the DEC PDP-11 architecture, with eight 16-bit registers (the H8/300H and H8S have an additional bank of eight 16-bit registers), and a variety of addressing modes. Unlike the PDP-11 however, the H8 architecture employs big-endian byte ordering.

Both H8/300H and H8S have eight 32-bit registers, each of which can be treated as one 32-bit register, two 16-bit registers, or two 8-bit registers, with the H8S having an internal 32-bit configuration. Several companies provide compilers for the H8 family, and there is a complete GCC port, including a simulator. There are also various hardware emulators available.

The family is continued with the H8SX 32-bit controllers.

Applications

H8S may be found in digital cameras, the Cybiko handheld computers, some ThinkPad notebooks, printer controllers, smart cards, chess computers, music synthesizers such as the Yamaha FS1R, Roland SC-55 and Roland JV880 and in various automotive subsystems. The LEGO Mindstorms RCX, an advanced robot toy/educational tool, uses the H8/300. An H8/3002 was used as a sound processor by Namco for various games it made in the late 1990s, notably those using its System 12 architecture and by Yamaha for the DB50XG and DB60XG daughterboards and the SW60XG ISA bus sound card.

H8/500 was being also used on a Nokia 2110 phone.

References

1. "H8はどうなるの". Cafe Rene. Retrieved 24 July 2018.
2. Git pull request for the H8 port on the LKML archives
3. "H8/36024Group, H8/36014Group 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series". p. 53. Retrieved 2023-12-20.
4. "H8S/2116". Renesas Electronics. Retrieved 2018-05-12.
5. Renesas H8S/2161BV on ThinkWiki.org
6. Renesas H8S/2116V on ThinkWiki.org
7. "FS1R Inside". Archived from the original on 2014-06-09. Retrieved 2014-08-19.
8. nukeykt (2024-11-24), nukeykt/Nuked-SC55, retrieved 2024-11-24

External links

• Renesas Electronics
• Online training for Renesas products
• A community support forum

v t e Hitachi
Divisions and subsidiaries	Current GlobalLogic Hitachi Cable Hitachi Cable Manchester Hitachi Canadian Industries Hitachi Capital Hitachi Construction Machinery Bradken Hitachi Construction Machinery (Europe) Hitachi Consulting Hitachi Data Systems (BlueArc) Hitachi Electronics Hitachi Energy Hitachi Medical Systems Hitachi Rail Hitachi Rail STS Hitachi Rail Italy Horizon Nuclear Power JECS Former Clarion Euclid Trucks Fabrik Hitachi Global Storage Technologies Maxell
Joint ventures and shareholdings	Current GE Hitachi Nuclear Energy (40%) Hitachi Astemo (66.6%) Keihin Nissin Showa Tokico Hitachi-LG Data Storage Johnson Controls-Hitachi Air Conditioning (40%) Tata Hitachi Construction Machinery (60%) Former Agility Trains Alaxala Networks Japan Display Casio Hitachi Mobile Communications Nippon Columbia Renesas Electronics
Products, services and standards	Current ALiS EMIEW Adaptable Modular Storage 2000 Hitachi Starboard Locomotives Hitachi Magic Wand Multiple units Hitachi 917 Hitachi SR8000 Hitachi TrueCopy LS-R M8 Stacked Volumetric Optical Disk SuperH Universal Storage Platform Defunct D-VHS H8 Family HD64180 HITAC HITAC S-810 Hitachi 6309 Deskstar Hitachi Flora Prius Hitachi G1000 Hitachi Hatsukaze Hitachi SR2201 Hitachi T.2 Hitachi TR.1 M6 Microdrive Travelstar
People	Namihei Odaira Kenichi Ohmae Hiroaki Nakanishi Takashi Kawamura
Places	Hitachi Kashiwa Soccer Stadium Hitachi, Ibaraki Hitachi Tower Tsūtenkaku
Other	DKB Group HDMI Licensing Hitachi 3Tours Championship Hitachi Data Systems History The Hitachi Foundation Hitachi Sundiva Hitachi SunRockers Hitachi Rivale Kashiwa Reysol
Now integrated into other Hitachi divisions or business groupings Sold to Western Digital Category Commons

• Renesas microcontrollers