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

Your correct - the SX52 has 4 more I/O pins than the SX48 and the package size is different. If you're just a experimenter and don't plan on designing a widget that goes into production - then just get the SX52 board. However if you're planning on a commercial product, note the SX48 chip costs $5 a piece, while the SX52 chip costs $7 a piece. $2 difference is a lot of money if you're building 1 million widgets!

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