Re: C2N232 CPU choice question

From: Jim Brain (brain_at_jbrain.com)
Date: 2004-03-31 08:26:59

Marko Mäkelä wrote:

>On Tue, Mar 30, 2004 at 09:42:51AM -0600, Jim Brain wrote:
>  
>
>>Looking over the C2N232 interface over the past few days, I am curious as
>>to why the Atmel controller was chosen over a PIC or Scenix controller? 
>>    
>>
>
>I didn't have any previous experience in programming microcontrollers, and
>a friend of mine happened to have a few AT90S2313 lying around.  I built the
>prototype with it, and it seemed to work okay.
>
>  
>
>>The AT part is no doubt qualified to run the interface, but it seems the
>>Scenix and PIC stuff has more mindshare.  Was it simply a sourcing issue,
>>or the desire to have the hardware UART, or just personal preference?
>>    
>>
>
>I don't think that the fast bit-banging protocol I designed would have been
>possible with the Microchip PIC.  The timing is already very tight on the
>AT90S2313, which has a hardware UART.  The Scenix parts, with clock rates
>of at least 50 MHz, would probably have required some expertise in circuit
>board design.
>
>	Marko
>
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>  
>
Fair enough.  I'm leaning in that direction, as the ATMega128 has a lot 
more pins than the SX (Yes, the PIC is out).  I see on the cmd2 version, 
an IEC port is mapped out.  Any work on that progressing?

Jim


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