Setting up MCLK/SMCLK on MSP430F532x without external crystall/oscillator

MSP430F532x_UCS_02.c (http://www.ti.com/lit/zip/slac503) shows how to setup the DCO using the 32 kHz REFO for 8 MHz. You only have to change the multiplier in UCSCTL2.

Take a look at Figure 5.1 in SLAU208 F5xx User's Guide.

Set the FLL clock source to REFOCLK, program the FLL for appropriate frequency, then select DCOCLK or DCOCLKDIV as the source for MCLK and SMCLK.