MSP430F6779A: Need help with Timers

Hi Harsh,

Maybe you can refer to this code example:

http://dev.ti.com/tirex/explore/node?node=ABDjsXjkDdnRm9lTo.36kg__IOGqZri__LATEST

Best Regards

Johnson

Hi Johnson,

That's what I was saying. In the code example you sent, the TA2CCR0 (PWM cycle period) is loaded with 128 and TA2CCR1 (duty cycle on/off period) is set with 32. The TA2CCR1 is used and not other register (for example - TA2CCR2) because the pin 1.1 is mapped to TA2.1. So we load the value 32 in TA2CCR1. What I am concerned with here is the pin where I want to generate PWM (Pin 4.7) is mapped to TA3.0. So if I set TA3CCR0 with PWM cycle period, I am not left with any register where I could load duty cycle ON/OFF value. This was the code you sent.

#include <msp430.h>

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

    // Setup P1.1 TA2.1
    P1DIR |= BIT1;                          // P1.1/TA2.1
    P1SEL0 |= BIT1;                          // Output TA1

    // Setup TA2
    TA2CCR0 = 128;                          // PWM Period/2
    TA2CCTL1 = OUTMOD_6;                    // CCR1 toggle/set
    TA2CCR1 = 32;                           // CCR1 PWM duty cycle
    TA2CTL = TASSEL_2 | MC_3 | TACLR;       // SMCLK, up-down mode, clear TAR

    __bis_SR_register(LPM0_bits);           // Enter LPM0
    __no_operation();                       // For debugger
}

For my application, I would change it little bit. 

#include <msp430.h>

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

    // Setup P4.7 TA3.0
    P4DIR |= BIT7;                          // P4.17TA3.0
    P4SEL0 |= BIT7;                          // Output TA3

    // Setup TA3
    TA3CCR0 = 128;                          // PWM Period/2
    TA3CCTL0 = OUTMOD_6;                    // CCR0 toggle/set. 
    TA2CCR1 = 32;                           // what register do I use here? I can't use TA3CCR0. This will just change the PWM cycle period and not give me a PWM. I can't use TA3CCR1 or TA3CCR2 (don't know even it exist because there are only two CCR register in TA3 - CCR0 and CCR1) because they are not mapped to the P4.7 pin. 
   TA3CTL = TASSEL_2 | MC_3 | TACLR;       // SMCLK, up-down mode, clear TAR

    __bis_SR_register(LPM0_bits);           // Enter LPM0
    __no_operation();                       // For debugger
}

I am unable to understand what register I use at the point where I marked the background Red. Is there any way around to generate PWM at that Pin? Please let me know. Thanks

Please check the comment at the line where I used the background color. Thanks