At 11:18 AM 1/9/97 CET, you wrote:
>Hi Antti (Antti Lukats), in <199708310905.MAA17686@peak.edu.ee> on Aug 30
you wrote:
>
>> with 16MIPS it possible as example to have timer ints at let say 4 microsecs,
>> or better at baudrate/16 making possible things like
>>
>> * 19200 full-duplex software UART   http://avrbasic.com/appnotes
>> * 250KBAud background UART (half-duplex)
>
>I don't think so.  The AT90S1200 has only 512 code words.  I have bought
>several of them but until today I am not that satisfied with it.  I once
>tried to interlock two lengthy but not too complex simultanous io
>operations into a 12C508 and found that 512 code words are not enough.  It
>actually was possible on 12C509 (1024 words).
>
>Assuming an AT90S1200 has only 512 words, most apps I can imagine that can
>benefit from its speed, don't fit into the part - even more so when a
>third/half of that space is used for virtual hardware like UART.

You have looked at our application Notes? have you??

Complete mini application using full-duplex background software UART at
9600/19200 Baud occupies 69 Words.

The amount of Virtual UART code is ~ 60 words. As some of the code is
co-shared (ie initialization that would have been used anyway) then the
actual code amount of the virtual full duplex UART is ~58 Words, still
a bit more than 1/10th, but but not 1/3 rd.
and there is still plenty of time in ISR to add more virtual hardware:

First 8 bit PWM channel: 6 Words additional
next PWM channel         4 Words additional code.

>It's nice to have the option, of course.  But for my project I have to wait
>for the AT90S2313 (1024 code words + UART + 20 MIPS).

Oh, yes we all are waiting for it.

Still at 1.80USD price I think AT90S1200 is pretty much OK with the
price/performance ratio. And there are lotsa applications possible.

antti




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