The maximum clock frequency of the MSP430F5436AIPZ is 18 MHz.
To configure the MSP430F5436AIPZ to use an external crystal oscillator, connect the crystal to the XIN and XOUT pins, and set the XT2OFF bit in the SYSCTL2 register to 0.
The maximum current consumption of the MSP430F5436AIPZ is approximately 2.1 mA at 3V and 18 MHz.
To use the built-in temperature sensor, enable the temperature sensor by setting the TSREFP bit in the SYSCTL2 register, and then read the temperature data from the TEMPERATURE register.
No, the MSP430F5436AIPZ is not 5V tolerant and should only be used with a power supply between 1.8V and 3.6V.