KEAZ128 OSC

[pg31321]

I want to using external clock.

When I set up all related parameter.

I burning program in KEAZ128 without external oscillator.

It seems to be working properly.

So,I thank that it still using internal oscillator.

What problem with my program?

My program like it:

#define ICS_C2_BDIV(x) (((uint8_t)(((uint8_t)(x))<<ICS_C2_BDIV_SHIFT))&ICS_C2_BDIV_MASK)
ICS_C1 = 0x80;
ICS_C2|=ICS_C2_BDIV(1); 
ICS_C3= 0x90; 
ICS_S &= 0xEF;
ICS_S |= 0x08;
while(!(ICS_S & 0x40)); 
   ICS_S |= 0x40; 
OSC_CR=0xA7;

[kerryzhou · Accepted solution]

Hi Customer,

    Your code is wrong, you didn't check ICS_S[IREFST] bit, please refer to the following code:

  /* ICS->C2: BDIV|=1 */
  ICS->C2 |= ICS_C2_BDIV(0x01);         /* Update system prescalers */
  /* SIM->BUSDIV: ??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,BUSDIV=0 */
  SIM->BUSDIV = 0x01U;                  /* Update system prescalers */
  /* Switch to FEE Mode */
  /* ICS->C2: BDIV=0,LP=0 */
  ICS->C2 = (uint8_t)((ICS->C2 & (uint8_t)~(uint8_t)(
            ICS_C2_BDIV(0x07) |
            ICS_C2_LP_MASK
           )) | (uint8_t)(
            ICS_C2_BDIV(0x00)
           ));
  /* OSC->CR: OSCEN=1,??=0,OSCSTEN=0,OSCOS=1,??=0,RANGE=1,HGO=0,OSCINIT=0 */
  OSC->CR = (OSC_CR_OSCEN_MASK | OSC_CR_OSCOS_MASK | OSC_CR_RANGE_MASK);
  /* ICS->C1: CLKS=0,RDIV=3,IREFS=0,IRCLKEN=1,IREFSTEN=0 */ //256 divider
  ICS->C1 = (ICS_C1_CLKS(0x00) | ICS_C1_RDIV(0x03) | ICS_C1_IRCLKEN_MASK);
  while((ICS->S & ICS_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
  }
  while((ICS->S & 0x0CU) != 0x00U) {    /* Wait until output of the FLL is selected */
  }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Wish it helps you!

Have a great day,
Kerry

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[pg31321]

I have write the " ICS_S[IREFST] bit" to '0' where using "ICS_S &= 0xEF"

Thank to your answers .
I will try your example code to check my program .

[kerryzhou]

You are welcome.

 Even you write it, you still need to wait it finished, as you know, switch to the external clock need time.

You can try it.

If you have any further question, just let us know.

Have a great day,
Kerry

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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