STM32F437 timer sizes

[John Hite]

Posted on March 30, 2017 at 18:47

I see varying information about whether the timers in my STM32F437 are 16 bit or 32. Maybe I missed a table in RM0090 or the data sheet. Could someone please point me to a place where this info might be consolidated?

So far by hit or miss it seems TIM2 is 32 bits and TIM4 is 16?

Thanks,

JH

[waclawek.jan]

Posted on March 30, 2017 at 18:49

RM0090 deals with this, although not in a single place, you have to read the introduction of all 4 timer chapters.

But, if you believe me, only TIM2 and TIM5 are 32-bit, the rest is 16 bit.

JW

[waclawek.jan · Accepted solution]

Posted on March 30, 2017 at 18:55

Oh yes, and Table 6 in the DS, DocID024244 Rev 10, might provide some insight, too...

JW

[John Hite]

Posted on March 30, 2017 at 19:08

Thanks, JW. I will take your word for it.

[Tesla DeLorean]

Posted on March 30, 2017 at 21:57

http://www.st.com/content/ccc/resource/technical/document/datasheet/fd/8c/0a/19/13/8f/41/99/DM00077036.pdf/files/DM00077036.pdf/jcr:content/translations/en.DM00077036.pdf

 

TIM2 and TIM5, pretty sad for a 32-bit micro, a small part of me weeps that someone in the design meeting didn't say *NO* much louder!! 

'Up to 17 timers: up to twelve 16-bit and two 32- bit timers up to 180 MHz, each with up to 4 IC/OC/PWM or pulse counter and quadrature (incremental) encoder input'

12+2 is 14, even for extremely large values of 2, and you can't count the 32-bit ones twice. And I'm pretty sure both the 32-bit timers on APB1 at 45 MHz (TIMCLK 90 MHz)

Who needs 17 timers anyway? Kind of indicative you've got some sub-par ideas about how a singular timer needs to function. How about ONE timer with 17x 32-bit comparators, or THREE with 8x?

[waclawek.jan]

Posted on March 30, 2017 at 22:44

12+2 is 14, even for extremely large values of 2

They count up the RTC, and the two watchdog *timers* - said Table 6 does not show this anymore, but you can see it in other STM32 DS. Funnily, SysTick is not counted.

How about ONE timer with 17x 32-bit comparators, or THREE with 8x?

Fancy to start  ''2017 Easter WishList''? 😉

Jan