Editing H8 Family (section)

==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 [[peripheral]]s such as timers, [[interrupt]]s<ref>{{Cite web |url=https://www.renesas.com/us/en/document/mah/h836024-group-h836014-group-hardware-manual?r=1052256 |title=H8/36024Group, H8/36014Group 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series |page=53 |accessdate=2023-12-20}}</ref> and [[serial port]]s, and amounts of [[read-only memory|ROM]], [[flash memory]] and [[random-access memory|RAM]]. Built-in ROM and flash memory tends to range from 16&nbsp;[[kilobyte|KB]] to 1024&nbsp;KB, and RAM from 512&nbsp;[[byte|B]] to 512&nbsp;KB.

The basic architecture of the H8 is patterned after the [[Digital Equipment Corporation|DEC]] [[PDP-11 architecture]], with eight 16-bit [[processor register|register]]s (the H8/300H and H8S have an additional bank of eight 16-bit registers), and a variety of [[addressing mode]]s. 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.<ref>{{cite web |title=H8S/2116 |publisher=[[Renesas Electronics]] |url=https://www.renesas.com/en-us/products/microcontrollers-microprocessors/h8s/h8s2100/h8s2116.html |access-date=2018-05-12}}</ref> Several companies provide [[compiler]]s for the H8 family, and there is a complete [[GNU Compiler Collection|GCC]] port, including a [[instruction set simulator|simulator]]. There are also various hardware [[in-circuit emulator|emulator]]s available.

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