MSP430G2553定时器timer0求解释下面的程序

#include  <msp430g2553.h>

void main(void) {   WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT 

 P1SEL|= 0x06;                            // P1.1 - P1.2 option select  

 P1DIR|= 0x07;                            // P1.0 - P1.2 outputs  

 CCTL0=OUTMOD_4+CCIE;                  // CCR0 toggle, interrupt enabled  

CCTL1=OUTMOD_4+CCIE;                  // CCR1 toggle, interrupt enabled  

TACTL=TASSEL_2+MC_2+TAIE;          // SMCLK, Contmode, int enabled

  _BIS_SR(LPM0_bits + GIE);                 // Enter LPM0 w/ interrupt }

// Timer A0 interrupt service routine

#pragma vector=TIMER0_A0_VECTOR

 __interrupt void Timer_A0 (void)

{   CCR0+=200;                              // Add Offset to CCR0 }

// Timer_A2 Interrupt Vector (TA0IV) handler

 #pragma vector=TIMER0_A1_VECTOR

__interrupt void Timer_A1(void)

{   switch( TA0IV )

   {   case  2: CCR1+=1000;                    // Add Offset to CCR1            break;  

case 10: P1OUT^=0x01;                   // Timer_A3 overflow            break;  

}

 }

求解释p1.1、p1.2口分别输出什么 波形是什么 频率是多少 如何计算的