Generate a 4Mhz clock

[jorge2399]

Posted on January 09, 2007 at 09:38

Generate a 4Mhz clock

[jorge2399]

Posted on January 09, 2007 at 05:38

Hi all,

Should it be possible to generate a clock of 4Mhz with a STR71x ? Indeed, i need to generate a clock in order to drive a ic. so, i'm wondering if a timer (with ti_ocmpa output) is able to do such a frequency ? My system is running at 60MHz (APB of TIM1 (with internal pll) ) Thanks in advance, Regards,

[kleshov]

Posted on January 09, 2007 at 09:31

The datasheet says that maximum allowed APB clock frequency is 33 MHz.

Using a timer, you can generate 1/2, 1/3, 1/4, 1/5 and so on fraction of APB clock frequency. See if one of those frequencies suits you. Regards, - mike

[jorge2399]

Posted on January 09, 2007 at 09:38

Quote:

On 09-01-2007 at 14:01, Anonymous wrote: The datasheet says that maximum allowed APB clock frequency is 33 MHz. Using a timer, you can generate 1/2, 1/3, 1/4, 1/5 and so on fraction of APB clock frequency. See if one of those frequencies suits you. Regards, - mike My APB clok is set to 24MHz. So, a 24Mhz/6 giving 4MHz should interest me. I didn't manage to have a higher frequency than around 1MHz (with prescaler =0) Have you a code example? Note: i tried this using tim1 as Output compare. Thanks Mike regards