how to get 50 % duty cycle with complementry pulse

[Ranjeet Singh]

i want to generate 50 % duty cycle at freuency (100khz-200 KHz), but i am not getting 50% , i am getting 33-34% duty cycle.this duty cycle change when the frequency change.

[Tesla DeLorean]

Show the functions initializing the timer.

Is the frequency as expected?

ARR = N - 1

CCR1 = N / 2

F​rom the scope screen it's hard to see the cycles, or if they are complementary.

Show all registers in TIM1

[Ranjeet Singh]

YES ,Frequency is same as expected

[Ranjeet Singh]

[Ranjeet Singh]

ARR = N - 1

CCR1 = N / 2

for this parameter

ARR = 150-1

CCR1 = 150/ 2

[Ranjeet Singh]

[Ranjeet Singh]

i am using the stm32 g0b1re Microcontroller Board

[Ranjeet Singh]

if i will use the same parametere at 1KHz frequency then i will got the 50% duty cycle.

time clock -64Mhz

prescale-64-1.

so i will get frequency 64/64= 1 Mhz.

and using ARR value = 100

frequency =1M/100= 10 KHz

CRR=50

duty cycle= (50*100)/100= 50 % duty

but when

prescale-1.

and using ARR value = 100

frequency = 317KHz

CRR=50

duty cycle= 25 % duty

using crr =50 and arr 100 why not duty cycle become 50n%?

[Ranjeet Singh]

what i m doing wrong ?

[AScha.3]

not wrong, but maybe there is some deadtime active.

timer -> complementary outputs = usually need deadtime .

try setting it very short.

+ set timerclk 64M , no prescaler.

for 10khz out -> arr 6400 , 300khz out -> 210 .