Newsgroups: comp.robotics
Path: brunix!cat.cis.Brown.EDU!agate!library.ucla.edu!csulb.edu!csus.edu!netcom.com!mfogarty
From: mfogarty@netcom.com (Michael Fogarty)
Subject: Re: Why won't 68hc11e1 work o
Message-ID: <mfogartyCoz9Fw.IGA@netcom.com>
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Date: Thu, 28 Apr 1994 16:21:32 GMT
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chris.gould@acornbbs.com wrote:
: N> I'm trying to bring up a RUG WARRIOR board which has 32K of external ram
:  > and standard serial I/O (MAX 233 WITHOUT hardware loopback).  Our suppliers
:  > over here are perpetually out of most of what you want so I used the
:  > 68HC11E1 
:  > instead of the 'A1.  If it matters, I'm using a PC for the development
:  > system. Now the fun starts ...

If you are looking for differences between the A1 and E1 they are:
1.  E1 has 512 bytes of RAM instead of 256 on A1.  This will have
    effects on your bootloader process.
2.  E1 has a BPROT register at $1035.  If your application writes to
    EEPROM (or _you_ do during development) you must clear the lower
    four bits at $1035.
3.  E1 doesn't come in a 48 pin DIP
4.  "E" parts have a longer boot ROM, from $BF00-$BFFF

mfogarty
