The maximum clock frequency for the MSP430F2011IN is 16 MHz, but it can be operated at frequencies up to 20 MHz with reduced voltage and temperature ranges.
To use an external crystal oscillator, connect the crystal to the XIN and XOUT pins, and set the FLLUNLOCK bit in the FLL_CTL0 register to 0. Then, configure the FLL_CTL1 register to select the crystal oscillator as the clock source.
The minimum voltage required to program the MSP430F2011IN is 2.2V, but it is recommended to use a voltage of at least 2.5V to ensure reliable programming.
To put the MSP430F2011IN into low-power mode, set the SCG0 and SCG1 bits in the STATUS register to 1, and then set the LPMx bits in the STATUS register to the desired low-power mode (e.g. LPM0 for low-power mode 0).
Yes, the MSP430F2011IN can be used with a 3.3V power supply, but the maximum clock frequency may be limited to 12 MHz at this voltage.
MSP430F2011IN datasheet
by Texas Instruments
