Newsgroups: comp.robotics
Path: brunix!sgiblab!sdd.hp.com!hp-cv!hp-pcd!hpcvca!hpcvcec.cv.hp.com!abrown
From: abrown@hpcvcec.cv.hp.com (Allen Brown)
Subject: Re: HC11 board design
Message-ID: <1993Sep28.015120.25240@hpcvca.cv.hp.com>
Sender: nobody@hpcvca.cv.hp.com
Nntp-Posting-Host: hpcvcec.cv.hp.com
Organization: Hewlett-Packard Company, Corvallis, Oregon USA
References: <CDLxvr.Etv@news.claremont.edu>
Date: Tue, 28 Sep 1993 01:51:20 GMT
Lines: 16

>>Really? How did he get away without the extra 21 pullup resistors?
>>Even if you had a way to eliminate the ones on port C, you'd have
>>IC1, IC2, IC3, Rxd, MISO, the 10 meg across the xtal, STRA...
>>etc. etc.
>>	-Ken Willmott

> These are just not necessary (except for the 10M on the xtal).  It may be 
> a loose design, but if the input capture, SCI, etc. systems are disabled
> the inputs can do whatever they want.
>	Bill Gribble

Bad idea!  I would guess you never checked the power dissapation.
CMOS inputs which are not at the rail tend to draw about 2mA each from
the power supply.
--
  Allen C. Brown  abrown@cv.hp.com or hplabs!hpcvca!abrown or "Hey you!"
