NJC was designing a home automation system, to control lights at preset intervals. He wanted to use the MSP430 Launchpad but found the high frequency clock source of the valueline MCU to be insufficiently accurate. He wrote this post on the MSP430 Launchpad Blog detailing how to install the 32.768kHz crystal and run an ACLK test to determine the accuracy of your time base. Code for the test is included highlighting the importance of including adjustments therein depending upon the value of the loading capacitors associated with the crystal.