stm8 TIM2 PWM configuration

First of all, this is my first time writing a blog. I hope to use this platform to record my growth experience in learning.

I have just come into contact with stm8 and am just getting started. If there are any mistakes or things that need to be corrected, I hope you can point them out. Thank you very much! 

This time I will mainly talk about the configuration of stm8s103 output pwm wave. First, the picture of the successfully output pwm wave and the relevant register values ​​is shown. 

First is the clock configuration:

CLK_ICKR &=0X01; //Turn on the internal high-speed clock

CLK_CKDIVR = 0x00; //Set the clock to the internal 16M high-speed clock

Consult the manual for relevant information (the manual is the most important tool and reference): 

Clock start operation: 

Set 16M high speed clock: 

Then we look at the CLK_CKDIVR register: 

So as long as all settings are set to zero, it means 1 division, and you can get a 16M high-speed clock; 

Next, configure TIM2:

    CLK_PCKENR1 = 0x20; //tim2 peripheral clock enable

    TIM2_CR1 = 0X00; //TIM2 counter disabled

The purpose of writing the first register here is to enable the tim2 peripheral clock (actually it is not necessary, it is enabled by default). The explanation of this register is as follows: 

Writing the second register disables the counter from counting at the beginning. The register is as follows: 

TIM2_CCMR3 |= 0X70; //Set timer 2 3-channel PWM mode 2 output mode    

TIM2_CCER2 |= 0x03; //Low level is valid, OC1 signal is output to the corresponding output pin

Here is mainly the configuration of the timer mode and enable 

CCMR3 is the mode register. 

This illustrates the pwm mode: 

CCER2 is the enable register; 

Next is the setting of pwm core, frequency and duty cycle:

/* Set the Autoreload value */

    TIM2_ARRH = 0x00;

    TIM2_ARRL = 0x8a; 

    /*TIM2 Frequency=16M/138=106k*/

    TIM2_CCR3H = 0x00; //Set PWM output duty cycle to 40%

    TIM2_CCR3L = 0X37;

Here is how to calculate it: 

From the clock configuration, we know that the clock is 16M, and the value of automatic reload is 0x008a=138; 

So f=16M/138=106k; 

Duty cycle calculation: 0x0037=55; Duty cycle=55/138=40%;

The final bit of configuration:

    TIM2_PSCR = 0x00; //No frequency division

    TIM2_IER |= 0X00; //Disable interrupt enable

    TIM2_CCMR3 |= 0X08; // Enable preloading

    TIM2_CR1 = 0X01; //TIM2 counter enable

There is still a frequency divider inside TIM2 (TIM3), so it needs to be set 

This is the basic explanation. Since it was my first time, I encountered many problems during the process. I also searched for various information on the Internet. Finally, I completed it. Finally, I hope that we can learn and improve together!