[beagleboard] Re: PWM Subsystem Time Base input clock frequency?
On Friday, January 31, 2014 1:38:32 PM UTC-5, robjss...@gmail.com wrote: According to the TRM, the Time Base module on each of the PWM subsystems is clocked directly from the cpu clock. That is, its being clocked at a period of 1 nsec. It can be prescaled down to 1/128,for a period of 128 nsecs. The period and the counter compare registers are only 16 bits wide so the minimum PWM frequency is about 120 MHz. Is that correct? Bob Stewart sigh...thanks, you are correct. But, it is fast than I would have expected. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
[beagleboard] Re: PWM Subsystem Time Base input clock frequency?
On Friday, January 31, 2014 1:48:09 PM UTC-5, Peter Baltus wrote: I guess I would argue that with 16 bits the counter can count up to 65535 and wrap around after 65536 counts of 128ns max. That gives a max period of the PWM of 8.39ms and a min frequency of 119Hz - I think. But it has been a long day, so I might very well be very wrong ;-) Peter Sigh...you are correct! But it's still a higher frequency than I expected for the slowest PWM signal. I thought that the input clock might not be at the cpu frequency. Thanks. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups BeagleBoard group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
