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From: jwt@atari.UUCP (Jim Tittsler)
Newsgroups: comp.sys.atari.st
Subject: Re: MFP problems
Message-ID: <772@atari.UUCP>
Date: Thu, 25-Jun-87 21:54:17 EDT
Article-I.D.: atari.772
Posted: Thu Jun 25 21:54:17 1987
Date-Received: Sat, 27-Jun-87 09:14:02 EDT
References: <8706240140.AA17054@ucbvax.Berkeley.EDU>
Organization: Atari Corp., Sunnyvale, CA
Lines: 11
Summary: MFP Clock is 2.4576 MHz

In article <8706240140.AA17054@ucbvax.Berkeley.EDU>, HAHN_K@DMRHRZ11.BITNET writes:
> ... As far as I can see it's installing procedure uses a
> division factor of 64 (decimal, I suppose), and a counter that's
> set to 192 (C0 hex). IF I believe my documentation which says that
> the MFP 68901 uses a 4Mhz - clock cycle, then what?

The MFP in the ST series is clocked at 2.4576 MHz (a number that generates
"correct" baud rates).  Therefore 2.4576 MHz prescaled by the divide by 64
(decimal) and then divided by 192 (decimal) produces a 200 Hz clock.

Jim Tittsler, sort of a hardware guy, Atari Corp.  {ames, sun}!atari!jwt