The maximum clock frequency for the MSP430FG4250IDL is 16 MHz, but it can be overclocked to 20 MHz with reduced voltage and temperature range.
To use an external crystal oscillator, connect the crystal to the XIN and XOUT pins, and configure the UCSCTL6 register to select the external clock source. Also, ensure that the crystal frequency is within the recommended range of 3.2 kHz to 16 MHz.
The minimum voltage required for the MSP430FG4250IDL to operate is 1.8V, but it is recommended to operate at a minimum of 2.2V for optimal performance.
The built-in temperature sensor on the MSP430FG4250IDL is a 10-bit analog-to-digital converter (ADC) that can be accessed through the ADC10 module. Configure the ADC10 module to read the temperature sensor, and use the temperature sensor calibration data provided in the datasheet to convert the ADC reading to a temperature value.
No, the MSP430FG4250IDL is not 5V tolerant and should not be used with a 5V power supply. The recommended operating voltage range is 1.8V to 3.6V.