Re: My hat is off to Microchip and their CEO!

Article View: sci.electronics.design

Article #667

Back to sci.electronics.design Previous Next

#667

From: Swanny
Date: Fri, 30 Oct 2009 05:43

29 lines
2580 bytes

Nik Rim wrote:
> "Swanny" <swanny@nospam.org> wrote in message 
> news:72uGm.50908$ze1.32966@news-server.bigpond.net.au...
>> a7yvm109gf5d1@netzero.com wrote:
>>> Refurbished LEDs? LOL!
>>> Microchip's always been a cool company, but a shite MCU architecture.
>>> Sorry, Microchip. I'll use your DACs though!
>> Maybe you don't understand the benfits of MH architecture.
> 
> 
> Tell me what they are. (Genuine question)
> thanks
> 
> 

Briefly, the Modified-Harvard architecture used in the PIC devices
separates the program memory from the data memory, in other words
separates the ROM/FLASH program memory from the RAM. In the case of the
PIC, the program memory bus width is larger than the data memory bus
width, allowing transfer of the complete instruction op code in fewer
cycles (many instructions take only 1 cycle).

The PIC peripheral bus (ie that accessible through external pins) uses
the same bus as the data memory and hence is also isolated from the
program memory. From a security perspective this allows sensitive data
(such as encryption keys etc) to be stored in program memory and be
completely inaccessible from the outside (provided the fuses are blown
after programming). The Microchip devices are particularly good in this
respect.

Technical Details

Message-ID: <G1vGm.50913$ze1.9795@news-server.bigpond.net.au>

Path:

arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!news.glorb.com!news.linkpendium.com!news.linkpendium.com!pit-transit.telstra.net!news.telstra.net!news-server.bigpond.net.au!53ab2750!not-for-mail

References:

<a7nGm.354$hJ2.98@newsfe13.iad> <74a52943-f086-451d-bb24-99783529b1bc@d5g2000yqm.googlegroups.com> <72uGm.50908$ze1.32966@news-server.bigpond.net.au> <_NSdndVPsfmd83fXnZ2dnUVZ_sudnZ2d@westnet.com.au>

Show Full Headers

Complete Article Headers

X-Google-Thread: a5a6238865,3efb481b0f84bbd4
X-Google-Attributes: gida5a6238865,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Path: arc1-ca.pugleaf.net!g2news2.google.com!news1.google.com!news.glorb.com!news.linkpendium.com!news.linkpendium.com!pit-transit.telstra.net!news.telstra.net!news-server.bigpond.net.au!53ab2750!not-for-mail
From: Swanny <swanny@nospam.org>
User-Agent: Thunderbird 2.0.0.23 (Windows/20090812)
MIME-Version: 1.0
Newsgroups: sci.electronics.design,aus.electronics
Subject: Re: My hat is off to Microchip and their CEO!
References: <a7nGm.354$hJ2.98@newsfe13.iad> <74a52943-f086-451d-bb24-99783529b1bc@d5g2000yqm.googlegroups.com> <72uGm.50908$ze1.32966@news-server.bigpond.net.au> <_NSdndVPsfmd83fXnZ2dnUVZ_sudnZ2d@westnet.com.au>
In-Reply-To: <_NSdndVPsfmd83fXnZ2dnUVZ_sudnZ2d@westnet.com.au>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Lines: 29
Message-ID: <G1vGm.50913$ze1.9795@news-server.bigpond.net.au>
Date: Fri, 30 Oct 2009 05:43:02 GMT
NNTP-Posting-Host: 144.136.64.36
X-Complaints-To: abuse@bigpond.net.au
X-Trace: news-server.bigpond.net.au 1256881382 144.136.64.36 (Fri, 30 Oct 2009 16:43:02 EST)
NNTP-Posting-Date: Fri, 30 Oct 2009 16:43:02 EST
Organization: BigPond Internet Services

Reply to Parent Message