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Article #668Re: My hat is off to Microchip and their CEO!
From: Nik Rim
Date: Fri, 30 Oct 2009 06:47
Date: Fri, 30 Oct 2009 06:47
34 lines
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3184 bytes
"Swanny" <swanny@nospam.org> wrote in message news:G1vGm.50913$ze1.9795@news-server.bigpond.net.au... > Nik Rim wrote: >> "Swanny" <swanny@nospam.org> wrote in message >> news:72uGm.50908$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. thanks Swanny, that makes sense.
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