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

Jason,

   2.7V is the minimum.But even so, using the internal OSC will not give you enough accuracy for serial input so you really wouldn't be able to read the GPS unit reliably without a TTL OSC, resonator or crystal connected anyway.  Out of curiosity, what powers the GPS module?

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