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MSP430G2231: Generation of two PWM signals

Sivakumar Selvam
Prodigy 50 points
Part Number: MSP430G2231

Hello friends,

       I'm new to TI processor. I have started to work in TI MSP430G2231 processor. My intention is to generate two PWM signal with same frequency but dutycycle of PWM signals is independently controllable through a external potentiometer. So far i achieved in generation of one PWM signal. Is is possible? Help me to achieve this.   

       More over, when i gone through the datasheet, the following pins are mentioned with

P1.1 ->TA0.0

P1.2 ->TA0.1

P1.5 ->TA0.0

P1.6 ->TA0.1 What does it mean?

  • 0
    Guru 96305 points

    For your purposes, TA0.1 carries the output generated according to Timer A [0] CCR 1 (TACCTL1/TACCR1). You connect the timer to the pin using P1SEL.

    Similarly for CCR0. Unfortunately, CCR0 has very limited PWM capabilities (ref SLAU144J Sec 12.2.5.1), not PWM in any meaningful form.

    Since the G2231 doesn't have a CCR2 (TA0.2), to get 2x (different) PWM streams you'll probably need to do PWM in software.

    Is use of the G2231 a requirement?

    [Edit: Added "(different)"]

  • 0 in reply to Bruce McKenney
    Prodigy 50 points
    Thanks Bruce. No G2231 is not mandatory to use. Instead can I go for G2553?
  • 0 in reply to Sivakumar Selvam
    Guru 96305 points
    Yes, I think the G2553 would be quite suitable. The G2553 is a 20-pin (vs 16-pin) device, but e.g. the G2 Launchpad has a 20-pin socket. (Last I checked, the G2 Launchpad came with a G2553 in the box.)

    This will actually give you 4x PWM channels (TA0.1/2, TA1.1/2).
  • 0 in reply to Bruce McKenney
    Prodigy 50 points

    Ok Bruce. Once again Thanks :)

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