The maximum operating frequency of the MSP430F5358IZQWT is 20 MHz, but it can be overclocked to 25 MHz with reduced voltage and temperature range.
To configure the MSP430F5358IZQWT for low-power operation, use the Power Management Module (PMM) to select the desired power mode (e.g., LPM3 or LPM4), and adjust the clock frequency and voltage using the Digital Clock Module (DCM) and the Voltage Level Translator (VLT) respectively.
Yes, the MSP430F5358IZQWT can be used with an external crystal oscillator. The device has an internal oscillator that can be bypassed to use an external crystal oscillator. The external crystal oscillator can be connected to the XIN and XOUT pins.
The MSP430F5358IZQWT can be programmed using the Texas Instruments Code Composer Studio (CCS) integrated development environment (IDE) or the IAR Embedded Workbench. The device can be programmed using the JTAG or Spy-Bi-Wire interfaces.
The MSP430F5358IZQWT has 512 KB of flash memory, and the maximum amount of flash memory that can be programmed is 524,288 bytes (512 KB).