The fifth program of STM8S208R8 --- clock CCO output verification

/************************************
Verify the clock output function of PE0 pin, and use an oscilloscope to view the output 24M clock

After connecting to ST-LINK, in DEBUG mode,
select crystal clock source in Option Bytes EXTCLK
Confirm Flash_Wait_States is set to 1
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void GPIO_INIT() //PE0 pin CCO output enable, according to the manual, it can be set to pull-up input or push-pull output
{
  PE_DDR_DDR0=1;
  PE_CR1_C10=1; //PE push-pull output
}
void CLK_INIT()
{
  CLK_ECKR_HSEEN=1; //Open external
  while(!CLK_ECKR_HSERDY); //Wait for external clock to be ready
  CLK_SWCR_SWEN=1; //Enable clock switching
  CLK_SWR=0XB4; //HSE is the main clock source
  while(!CLK_SWCR_SWIF); //Wait for switching to succeed
  CLK_SWCR_SWEN=0; //Clear switching flag
  CLK_CKDIVR=0; //No frequency division
}
void CCO_INIT()
{
  CLK_CCOR_CCOSEL=2; //Modify it according to the manual and you can see the external clock we want, 24M or 16M 128K, etc.
  CLK_CCOR_CCOEN=1; //Enable clock output
}
void main()
{
  GPIO_INIT();
  CLK_INIT();
  CCO_INIT();
  while(1);
}

/****************************************************************
I have to mention here that in the iostm8s208r8.h file that comes with IAR for STM8S, the O in OPQ is written as zero in CCOBSY.
If you use it, you must pay attention to it. At least the software I installed has such a problem, although it is not important
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