diff --git a/README.md b/README.md
index 9a47e86..b024bf2 100644
--- a/README.md
+++ b/README.md
@@ -35,40 +35,20 @@ cd linux
 
 ![image-20211227114136603](markdown.assets/README.assets/image-20211227114136603.png)
 
-3.在弹出的终端输入 stm32_pwm_computer.exe 168 33
+3.在弹出的终端输入指令
+
+![image-20220607194112890](markdown.assets/README.assets/image-20220607194112890.png)
 
-```
 Tip:
-	stm32_pwm_computer.exe stm32系统时钟(mhz) 期望的PWM频率(khz)
-```
 
-```powershell
-C:\Users\zhaohe\Desktop\stm32_timer_pwm_computer\release>stm32_pwm_computer.exe 168 33
-******************************************************
-* author: 赵贺                                       *
-* e-mail: zhaohe@163.net                             *
-******************************************************
-*
-* systemclk  : 168.000000 mhz
-* expect freq: 33.000000 khz
-*
-******************************************************
-* APB1: TIM2  TIM3  TIM4  TIM5  TIM6  TIM7
-*       TIM12 TIM13 TIM14
-*
-* timer_module_clk: 84.000000 mhz
-* freq            : 33.005895 khz
-* period          : 0.030298 ms
-* prescaler       : 0
-* autoreload      : 2544
-*
-* APB2: TIM1 TIM8 TIM9 TIM10 TIM11
-*
-* timer_module_clk: 168.000000 mhz
-* freq            : 33.005895 khz
-* period          : 0.030298 ms
-* prescaler       : 0
-* autoreload      : 5089
-******************************************************
+​	1.根据stm32cubeMX中时钟树和定时器序号，确定定时器输入时钟频率
+
+![image-20220607193841283](markdown.assets/README.assets/image-20220607193841283.png)
+
+2.部分频率不能恰好一样，会存在一定的误差
+
+```
+这是因为寄存器不能整除导致的，当频率越来越大，这个误差就会越来越大。
 ```
 
+![image-20220607194308252](markdown.assets/README.assets/image-20220607194308252.png)
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