I believe I am seeing a variation of a timer period of 20% in the temperature range -40 deg C to 80 deg C.
I have an ISR that raises an interrupt every 50ms on timer A1, the timer source is SMCLK which in turn is
sourced from DCOCLK which is set at 16Mhz using the constants:
CALDCO_16MHZ
CALBC1_16MHZ
defined in msp430g2755
Is this possible, I believe the data sheet indicates a variation of only + / -6%.