piclist 2000\05\26\191144a >
Thread: Microcontroller with 4 USARTs and 40 pins
www.piclist.com/techref/io/serials.htm?key=usart
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face BY : Edson Brusque email (remove spam text)



Hello Dan,

> Scenix can easily do this, **BUT** you will have to go to 48 or
> 52-pin PQFP part - with tiny smt pads - to get 24 additional I/O lines.
> No PLCC available. [or possibly do a multiprocessor with 18 & 28
> pin parts - not all that hard to build off a single RS-232 host line].
>
> And I suspect with the scenix, you actually could get the weird
> 31250 rate you indicate here - or any other weird baudrate imaginable.
> But whatcha gonna talk to at that speed?

   31250bps isn't weird: 1,000,000 (instructions for second) / 31250 (bps)
= 32 (instructions for serial bit).

   I'm looking at an Atmel datasheet. It says the AT89C55 can do 33MHz, but
how much clocks does it takes to execute one instruction? Why few
manufacturers put this information on the datasheets??? 33Mhz equals to
33MIPS? Or 8,25MPIS? Or 2,75 MIPS???

   Regards,

   Brusque

<006c01bfc768$396c7a80$41a0f7c8@bigbru> 7bit

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