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TEST0 TEST1 FUNCTION
0 0 Selects 48-MHz clock input (from an oscillator or other onboard clock source)
0 1 Reserved for testing purposes
1 0 Reserved for testing purposes
1 1 Selects 12-MHz crystal as clock source (default)
TEST2 - Test input2, Schmitt-trigger input, 100 µA active pullup. This pin is reserved for testing purposes and should be left unconnected.
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