In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

I don't think you're going to find another chip similar to the SX48 in all the factors you mentioned.  There are a lot of microcontrollers on the market with the number of I/O pins you want, but there are none really with the high end clock speed of the SX48.  On the other hand, some of the functions handled by the SX48 using interrupt handlers would be handled by dedicated I/O units so the clock speed might not be necessary for most applications.  Some of the Atmel AVR devices have the right number of I/O pins and a similar price, but run about 1/2 the speed of the SX48.

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