Stm32f407vgtx Timer Funtionality

[Ash1]

Hi 

I am facing one issue I am trying to run Timer2 and as soon I have enable the by setting CR1 register bit CEN, My all flags in SR is getting set even I have enabled only(UIE) so my UIF flag bit in SR register must set but it is setting all (CC4IF CC3IF CC2IF CC1IF) .

Can you help me to understand is it normal or why it was happened?

B.R

Ashish

[TDK]

The flags get set regardless of whether or not the interrupt for that flag is enabled.

CCxIF flags will be set if CCRx = 0 and the counter is started with the channel in output mode (default). If the interrupt is not enabled, it will not fire as a result of these flags. This is the expected behavior and no action is required.

[Ash1]

Hi 

Thansks for your reply .

I have another doubt which I am facing I am running timer1 at 1MHZ clock frequency so When I loaded value in ARR with (999) which represents me 1ms delay(Which is fine I am able to generate 1ms delay).

But when I am loading 999 value in CCR1 register instead of in ARR register (Note : I am getting delay of 500 microseconds and total wave is 1ms so I want to know Why  is it working like this can you help me with understanding.)

NOTE: I am working with downcounter and in my ARR register value is 0xFFFF.

I have attached screenshots of registers for better understanding.

B.R

Ashish

[TDK]

The Reference Manual goes into detail into how to timer operates.

Why are you loading 500 in CCR1? What is your goal here?

The screenshots show CCR1 is not 500.