The maximum operating frequency of the MSP430F6436IPZR is 20 MHz, but it can be overclocked to 24 MHz with reduced voltage and temperature range.
To configure the MSP430F6436IPZR for low-power operation, use the Power Management Module (PMM) to select the desired power mode (e.g., LPM3, LPM4), and adjust the clock frequency and voltage using the Digital Clock Manager (DCM) and the Voltage Regulator (VR).
Yes, the MSP430F6436IPZR 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 MSP430F6436IPZR 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 MSP430F6436IPZR has 256 KB of flash memory, and the maximum amount of flash memory that can be programmed is 248 KB, leaving 8 KB for the boot loader and other system functions.