There's an internal oscillator on the uC. "32kHz crystal increases MSP430 MCUs’ integrated digitally controlled oscillator to real-time accuracy for various pe

There's an internal oscillator on the uC. "32kHz crystal increases MSP430 MCUs’ integrated digitally controlled oscillator to real-time accuracy for various peripherals and timers" But even running at 32kHz you can do real work, probably even run a MUMPS deployment.