Binary counter

Piergiuseppe Tundo

Hi all.

Using an MSP430, I am not able to figure out a way to make a binary counter with all the outputs available at external pins (3 would be enough) that works at some fixed frequency without the intervention of the software (LPMx) and not using more than two timers.

Of course I know that in software I could just increase the value of an output port, I'm asking for a fully peripheral solution.

Any hints?

Regards.

over 14 years ago

0 Jens-Michael Gross over 14 years ago

Guru 227245 points

i can imagine a solution which involves the timer and teh DMA controller.

The external clock signal is routed to the DMA request pin and the timer external clock input. The timer counts the incoming pulses, and on every clock puls, a DMA is triggered that copies the current timer coutner to the port output register.

However, it requires MCLK (used for the DMA) to be a at least by a factor of 4 higher than the highest pulse frequency.

0 Piergiuseppe Tundo over 14 years ago in reply to Jens-Michael Gross

Genius 3155 points

Your idea of putting out a timer counter by DMA is very interesting.

Thank you.

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Binary counter