Path: utzoo!utgpu!attcan!uunet!lll-winken!csd4.milw.wisc.edu!dogie.macc.wisc.edu!uwvax!rutgers!att!homxb!opus!ki4pv!macs!mdg
From: mdg@macs.UUCP (Mark Griffith)
Newsgroups: comp.sys.m6809
Subject: Re: fast clock for 6809
Message-ID: <21187626@macs.UUCP>
Date: 20 Apr 89 13:22:52 GMT
References: <1605@ccnysci.UUCP>
Organization: Stetson University, DeLand FL
Lines: 21

In article <1605@ccnysci.UUCP>, jhuang@ccnysci.UUCP (Jian Huang) writes:
> 
>  I was very glad to find this group because I play m6809
> almost every day. We use it in our complicated step motor
> contoller. This group will give me a lots help.
>  Recently we try to improve the system performance without
> hardware modification. One way is using higher system
> clock. MC68b09 can only run at 2 mhz. Is there any fast
> version available? We ran that chip at 3 mhz wihtout any
> problem. But I don't know the long-term effect to the
> system. Does anyone have such experience on this?

Hitachi makes a 3Mhz version of the 6809, but for the life of me, I
can't remember their part number for it.  Call you local Hitachi office
and ask them.  I understand it is a CMOS version certified for 3Mhz, but
has been run at 4Mhz without problems.

Mark

UUCP: mdg@macs
BITNET: GRIFFITH@STETSON