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robert_from_philips said:Hi,
funny enough, a 32-bit micro might be a low cost solution for you except for your 5V requirement.
The LPC2101/2102/2103 would provide 8/16/32k of Flash with more SRAM than you need 2 UARTs and 2 SPIs (and 2 I2Cs and ADC...) for a very low price.
You can check here:
http://dkc1.digikey.com/de/digihome.html select your country or one close by and put LPC2101 in the Search box.
Robert
Oh by the way, there are compilers like the GNU free of charge or ke*il (16kB limited) or IAR 32k limited versions that are free.