Is it possible to get a stable frequency from the 
internal high speed digitally controlled oscillator (DCO) 
on MSP430x1xx devices that have the Basic Clock module 
without the frequency locked loop (FLL)?

The DCO frequency can be calibrated and set to a specific 
frequency with compensation for changes in voltage, temperature, 
and differences between parts. Generally a low speed crystal or 
external signal is used for this purpose by comparing the number
of high speed DCO clock cycles that occur during one cycle of the
low speed reference frequency. Using software, Basic Clock control 
registers are adjusted to set the DCO to the desired frequency 
multiple of the slower crystal or signal. The device datasheet 
details the operating range of the DCO. The MSP430x1xx User`s Guide 
provides details of the Basic Clock. 

Example code and application reports that demonstrates the setting 
of the DCO are available from the MSP430 website.