MSP430G2352 timer question

abhishek Sabnis

Other Parts Discussed in Thread: MSP430G2352

Hi,

I am using MSP430G2352. In my application i use timer A in up mode to generate PWM output. and i want to use timer for timer interrupt. since this micro has only one timer can use same chip for both purpose.

THanks,

over 11 years ago

0 old_cow_yellow over 11 years ago

Guru 58965 points

Yes, you can use the same Timer to do both. But the interrupt must be in sync with the PWM.

0 abhishek Sabnis over 11 years ago in reply to old_cow_yellow

Expert 1730 points

Thanks. Could you explain me in details what do you mean by "Sync"

0 Andrew Marsh over 11 years ago in reply to abhishek Sabnis

Intellectual 765 points

IE your timer interval should be a multiple of the pwm frequency for simplicity.

0 Jens-Michael Gross over 11 years ago in reply to Andrew Marsh

Guru 227245 points

Andrew Marsh said:
IE your timer interval should be a multiple of the pwm frequency for simplicity.

Well, it must be exactly the PWM frequency. The interrupt may happen at the timer overflow or at the end of the duty cycle. But it will happen once per timer cycle, which is also the PWM frequency.

However, inside the timer ISR, you may chose to skip every 2nd interrupt or 2 of 3 or so, by increasing a counter and only doing some actin when the counter reaches a certain value.

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