KEAZ128 OSC

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KEAZ128 OSC

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pg31321
Contributor III

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;

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kerryzhou
NXP TechSupport
NXP TechSupport

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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kerryzhou
NXP TechSupport
NXP TechSupport

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
Contributor III

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 .

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kerryzhou
NXP TechSupport
NXP TechSupport

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

 

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