I have a very simple assembly program which sets up aclk output on 
one of the ports and port2 interrupts and no matter what I have 
tried, I can't get C-Spy to show me the aclk pin toggling.  Aclk is 
working because I have TimerA hooked up to it and it is running fine. 
Also, I set up port2 to have interrupts and the only way I can get 
the interrupt to fire is to manually change the P2IFG flags which 
then causes the correct action.  If I use pin I/O files to change 
port2 pins or change the pins manually, the P2IFG flags never get 
set. Are these 2 limitations of the TI simulator within C-Spy?   Have 
people gotten C programs using interrupts to work?

hi , 
    we are working on msp430f149 and had the same problem. as the 
ports and the clk out pins have the same external pin number, 
configuring as port makes the "pin" out function inaccessable. for 
example in 149, the pin 49 is used as one of the port 5 pins and as 
the output pin for smclk. we had configured the pin as port and hence 
were unable to get the toggling of the smclk at that pin. use the 
PSEL register to configure the pin as port(defult) or special 
function pin. the other problems with port 2 is also most probably to 
do with psel. so just check psel every time u use its corresponding 
port,
      bye