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enbeded I/O 2

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wstorts

wstorts

Electrical
Joined
May 27, 2002
Messages
4
Location
US
Task: 32 bit input and 8 bit output I/O needed.
Bit to bit isolation not required, common source/sink OK.
TTL logic level OK.
Looking for micro-controler to handle TX/RX for these input and output signals from field equipment to PC using RS-232 or 432 speed not critical.
Does anynbody know a good source, Prehaps 8051 series ??
All of the enbeded Micro-Controlers I have found do no support more than 16 bits of discrete I/O.
Thanks
Wayne
 
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Hi, an expanded 8051 such as 80c537 has enough ports.
 
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If you want built-in flash memory and reasonable price, lots of I/O pins, take a look at the Atmel AVRmega64.
 
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If you want to go with a versatile but finished product rather than individual chips and can spend several hundred dollars on it, then try industrial monitoring devices such as DeviceNet, National Instrument's Field Bus or even one of their DAQ cards ( or DataForth modules. These all run on serial, are generally designed for monitoring multiple sensors in a remote environment, and typically handle sampling rates up to 50 samples/second.
 
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If speed not critical, use the PC parallel port directly.
You can get expansion board to it, too.

<nbucska@pcperipherals.com>
 
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Also you can use an AVR mcu from ATMEL: AT90S2313 (a cheap one) and a PPI from Intel 8255. Set all ports of 8255 as outputs and for 8bit input port use 8bit port of 2313. the mcu has internal circuitry specialized for serial I/O RS232.
 
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