MTIM and MPRSR confused me

rk_web04 · ‎2006-01-31

Posted on February 01, 2006 at 04:20

rk_web04 · ‎2006-01-31

Posted on January 31, 2006 at 11:32

Hi.

I have a little problem in understanding. I try to drive a BLDC motor with the ST7FMC. But the working flow of MTIM timer is a little confusing.

For example:

F_Periph = 4 MHz and the MPRSR Reg is loaded by 8 and the uC works in switched mode.

So, that means the MTIM works at a clock of 7,8125kHz. Now it takes 19.2ms for next C event then MCOMP comprised 150.

Is this right?

Now comes the confusing part for me. What means the associated step frequenzy in table 40/page 175 at the datasheet? Is this the real clock for MTIM or what does that mean? :-?

Unfortunatly the describtion in the datasheet is not clear enough for me. Thats why I ask for some additional informations.

Thanks a lot,

RoB.

luter · ‎2006-01-31

Posted on February 01, 2006 at 04:20

Hi.

I would recommend u to post your messages on motor control forum.

There u can find answers on most of your questions.

About you current problem take a look on

http://mcu.st.com/mcu/modules.php?mop=modload&name=Splatt_Forums&file=viewtopic&topic=2696&forum=13

Good luck.