CCS/MSP430F247: MSP430F247 as a signal generator

Hi,

it is of course possible to generate multiple PWMs with one or more Timers of the MSP430F247. When using just one timer, of course you can vary only the duty cycle, but the frequency will be of course the same for all three signals, as the Timer base will be the same.

If it should be three different frequencies, then you'd need three PWMs from three different Timers.

The other question would be, whether you just need some digital clock signals, or would like to generate analog signals. In the second case you'll need to apply some filtering at the PWM output, to cut off the edges.

The PWM generation can operate without interrupts/CPU involvement. In CCS and the TI Resource Explorer within CCS you can find multiple code examples for PWM generation.

Best regards

Peter

Thank you for your reply Peter,

no... I need 3 different square waves working at 3 different frequencies...using TA and TB I'm able to generate 2 programmable frequencies...but I need the third signal...

Can you let the MCU generate the lowest frequency brute force?

Hi Luigi,

understood. That's of course a problem with the MSP430F247, as you have only 2 16-bit Timers. Have you considered moving to another MSP430 derivative? Especially in our MSP430 FRAM portfolio, we have devices with more Timers on chip. What features and modules do you need?

Best regards

Peter

I can't because I have already the PCB...moving to FRAM I should redesign the PCBs (different pinouts..)...too expensive.

Regards

Hi Luigi,

understood. What about the three frequencies. Is there any fixed relation between them, e.g. like integer multiple, or is it completely volatile?

Best regards

Peter