MSP430F2013 program logic

i am using code composer to execute my msp430f2013 controller program ,i use 16 bit timer logic in the micro controller,
i use CCR0 register to count my timer value, i need to generate a digital pulse with 10ms ON time and 20ms OFF time ,i need to use only CCR0 register
in the program ,i use count value as 10,000 and 20000,so please any help me the program logic by using a single register CCR0 to execute the digital pulse