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PICList Thread
'[OT] Hitachi H8'
1999\03\24@192959 by Bob Drzyzgula

On Wed, Mar 24, 1999 at 06:40:11PM -0500, Bob Drzyzgula wrote:
> What I finally settled on is a commercial product called
> emWare; URL is

One other thing about the emWare stuff that I just got
is that it comes with an eval board based on the Hitachi
H8S/2134, which is one of the higher-end parts in the H8
line. So I've been studying the H8 stuff a fair bit for
the past couple of weeks, and it seems to be quite an
impressive part. The H8S/2134, for example, comes in an
80-pin PQFP (FP-80A or TFP-80C), has 128KB of flash ROM
for program storage, 4KB of RAM and runs at up to 20MHz. It
has quite an array of peripherals, can address up to 16MB
of external memory, and costs less than about $20 each. The
H8S/2138 even has a built-in 8-bit ISA interface supporting
three PC-style IRQs. There are less capable versions
that go down in price to well under $10, including OTP,
ROM and ROMless versions. As with many of these things,
one of the more difficult aspects is that the available
packages aren't particularly friendly to protoboard work,
and there isn't much in the way of a small-quantity retail
distribution. It is very much a CISC architecture, with
over 65 instruction *types*, bunches of different addressing
modes and three different run modes. It is supported by
the Hitachi's C compiler (not free) as well as the GNU
C compiler (free), although it seems as if the GNU C
port doesn't support all of the features of the part.

So I was wondering -- I never hear much about the H8,
there appear to be no H8 mailing lists (other than one for
the H8 port of GNU C that's seen two messages over the past
week), and just a little H8-related traffic in the general
Usenet newsgroups such as comp.arch.embedded; one hears
quite a bit more about the SuperH RISC parts. Nonetheless,
Hitachi claims that they sell a great number of the 8 and
16-bit H8 parts.

Has anyone on this list had much experience with them?
emWare sells the H8-based eval board for $79, and it
seems like a fairly decent starting point for a high-end
microcontroller project; there are some parts of my
project that would be pushing the limits of the PIC 16
parts, and I was thinking about using these in those
areas. Thoughts?


Bob Drzyzgula                             It's not a problem                until something bad happens

1999\03\25@015930 by Peter Tiang

Yup, Hitachi does make some pretty impressive microcontrollers.
Particularly they have massive RAMs & ROMs, e.g. their "low end"
8-bit uC H8/3644 4k RAM, 32k ROM sells for less than US$2.
The memory usage efficiency though is not as good as the PIC.

I do not want to generalise, but like most Japanese Semiconductor
companies their documentation and technical info flow sucks!
I know as I was working in Hitachi Semiconductor as a Sr Design
Engineer the last 3 years.

Hope this will change with the proliferation of Internet.
Check out for technical infos on
the H8 and SH.

Peter Tiang

{Original Message removed}

1999\03\26@133023 by gwaiche

picon face

>From my personal experience, Hitachi 5C are nice, but
the GNU C provided is really crap, at least I can say it
for SH1.


Peter Tiang wrote:
{Quote hidden}

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