Hi Kavitha! For the MSP430G2553 SMCLK is available as a special function at P1.4 and ACLK on P1.0: To make these clocks available, you have to configure the pins accordingly. For SMCLK this requires to set P1.4 to output direction by writing P1DIR |= 0x10; and set the selection 1 bit for P1.4 by writing P1SEL |= 0x10; Now SMCLK is available at P1.4 of the device. The datasheet has a table that shows what to do in order to use a specific function of a pin: Dennis
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