Hi...actually I am working in a project entitled "ecg wireless node".  I am using msp430fg4618 target board. So My question is may I solder  a 16 MHz crystal instead of 32.768 KHz crystal physically  on this target board as a ACLK (by the way soldering option is there  on Xin-Xout)   ....i.e.    ACLK is low freq source ...so If I use 16MHz in place of 32.768 KHz is there any issues arise.. (except low power mode issues...).