The maximum clock frequency of the MSP430F5310IPTR is 25 MHz.
To configure the MSP430F5310IPTR for low power consumption, use the low-power modes (LPM3, LPM4) and adjust the clock frequency, disable unused peripherals, and use the Power Management Module (PMM) to control power consumption.
Yes, the MSP430F5310IPTR can be used with an external crystal oscillator. The device has an internal oscillator, but an external crystal oscillator can be used for more accurate clocking.
The MSP430F5310IPTR can be programmed using the Texas Instruments Code Composer Studio (CCS) integrated development environment (IDE) or other third-party development tools.