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

Hello,

   The regulator's ability to provide a certain amount of current depends on several factors, the most important of which are input voltage and thermal relief.  The SX Proto Boards has a heat sink on the regulator, so it will provide more current than our boards without a heat sink at the same input voltage.  With an input voltage of 7.5V you can probably expect to get at least 400mA if not 500mA from that regulator before heat starts to become an issue.  As for the original question, you do have to add the combined current drawn from the I/O pins for max current draw, however the faster the clock on the SX the more current (power) it will draw.  That said, if you draw max current from the I/O pins with the SX running @ 50 MHz, you would still have plenty of available current left from the regulator.  Take care.

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