[beagleboard] Re: PWM Subsystem Time Base input clock frequency?

2014-01-31 Thread robjsstewart
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.

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[beagleboard] Re: PWM Subsystem Time Base input clock frequency?

2014-01-31 Thread robjsstewart
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.

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