eTimer Clock selection

[Sathish Sulegai]

Posted on March 22, 2018 at 18:36

Hello Dear Forum members,

This question is regarding SPC560P40L1 controller's eTimer module.

At the moment my eTimer module using 'IP Bus clock' which is of 64M Hz. I am using prescaler value of '32' to get 2M Hz to eTimer module.

I want to have clock frequency of 20M Hz(or 40M Hz or multiples of 20M Hz basically).

I see in the block diagram of technical datasheet that(Please see attachments) there is option to choose from clock sources: 'Clock' or 'IP Bus clock'

The crystal oscillator frequency is 40M Hz. I would like to use this frequency as input to my eTimer module but i don't know how or even it's possible to get this Frequency routed to eTimer ?

I would be happy if someone can share any useful tips or suggestion in this regard.

Best regards

Sathish 

#spc5 #spc5x #clock-selection #etimer

[Erwan YVIN · Accepted solution]

Posted on March 23, 2018 at 10:10

Hello Sathish ,

The RM is not clear in the clock domain

if you want to configure correctly,

It is a good thing to use the clocktree in SPC5Studio Tools Suite.

  Best regards

             Erwan

[Sathish Sulegai]

Posted on March 23, 2018 at 12:12

Dear Erwan,

Thank you for your reply.

In my project clock tree(Please see attachment) i do not see clock selection logic block for ''MC_PLL_CLK''.

Please let me know how could i add this block and how do i route this(MC_PLL_CLK) to eTimer module instead of  SYS_CLK with Prescaler ?

Freundliche Grüßen

Sathish 

[Erwan YVIN]

Posted on March 23, 2018 at 13:46

Hello Sathish,

for P40 Family, you should take SYS_CLK.

the clocktree is well valid (cf below)

The RM is a game of investigation 😉

  best regards

             Erwan