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Free H8 development environment under Linux
Chapter 4 Hardware


4.1 CPU board

To execute H8 program, of course, you must have a H8 CPU board. Nowadays, many H8 CPU evaluation boards are sold. If you are in Japan, AKI-H8 board by akizuki electronics is the best solution for amateur hobbiest, I think.

Making your own CPU board is also good. I think it is the best solution if you plan to make PCB for your application, and you solder CPU pins without bridges. h8board.pdf shows the circuit.


4.2 Flash writing hardware

To write flash memory of H8, adapter hardware to connect PC serial port is needed. h8writer.pdf shows the sample circuit. If you plan to use AKI-H8, DS232(RS-TTL level converter) must be excluded.

Note that CPU can easily destroyed if you connect wrong writer, because it uses relatively high voltage(+12V). Please do it at your own risk. Please use the sample circuit only if you know its behavior thoroughly, because it may have bugs.


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Free H8 development environment under Linux
version 1.0, 24 Nov 1999
Muneyuki IWATA kp9m-iwt@asahi-net.or.jp