Generate a 500KHz clock with an MC9S12DP512 running a bus of 24MHz

[fer]

Hello,

I am trying to create a 500KHz clock, and I want to be able to count each cycle of the frequency so that when the clock reaches 4096 cycles, it resets a counter and triggers some functions.

I want to be able to run the counter while sending 2035 bits of data using SPI.

I have created the 500Khz clock, but I am not able to count each indivudual cycle.

I am trying to generate this so that I can control some TLC5940's LED drivers.

Any help and advise is really appreciated.

Thank You

[RadekS · Accepted solution]

For generating clock you can use simply PWM module, however this module doesn’t have interrupt.

I would like to recommend externally connect PWM output pin and pin with interrupt feature.

This way you can count number of pulses.

In attachment you can find simple example code.