Msp430 logic problem timer

You mean delay in time, of course.

One way to do it is to make the CPU execute useless and harmless instruction for the desired interval of time. There is an intrinsic function called __delay_cycles(literally a #); The CPU executes instruction at the rate of the CPU clock (called MCLK) which can vary. Thus you need to know the frequency of MCLK you are using. If it is 8 MHz, for example, and then __delay_cycles(8000000); will cause a 1 sec delay, while __delay_cycles(16000); will cause a 2 msec delay. Note that if interrupt and/or DMA are enabled, they may cause additional delays on top of the __delay_cycles(#).

A different way to cause delay is to use a Timer which almost every MSP430 chip has at least one. These Timers do not know time either; they count other kinds of clock cycles (called SMCLK, ACLK, or INCLK). You can program the Timer to count the clock cycles and raise a flag that can also generate an interrupt. In the case of interrupt, the CPU can do other useful things or go to sleep while waiting. In the case of just the flag, the CPU can check the flag periodically. Other interrupts and DMA will not cause additional delays directly in either case, but the time required checking the flag or enter and execute the ISR are always added to the delay.