Hi,

I'm currently using an F449 with one 32kHz crystal on XT1 and one 8Mhz
crystal on XT2. I used a snipset of Code from TI to use both crystals.

My problem: MCLK is only 1.034 Mhz (probably DCO?) but SMCLK is 8MHz!
I did have selected the SELM switch but it does not appear to work..

Somebody has any suggestions?

Thanks
Martin
 
---------------------------------
  WDTCTL = WDTPW + WDTHOLD;       // stop watchdog timer
  FLL_CTL0 = XCAP18PF;            // set load capacitance for 32k xtal
  FLL_CTL1 = FLL_CTL1 & ~XT2OFF;  // clear bit = high freq xtal on

  do                              // loop until flag is clear
  {
    FLL_CTL0 = FLL_CTL0 & ~XT2OF; // clear high freq oscillator fault flag
    for (i = 50000; i; i--);      // delay for crystal to start and
FLL to lock
  }
  while (FLL_CTL0 & XT2OF);       // test high freq oscillator fault flag
  
                                  // if flag remained clear then -  
  FLL_CTL1 = SELS;                // switch SMCLK = HF xtal          
      
  FLL_CTL1 |= SELM_XT2;
  P1DIR = 0x32;                   // P1.1, P1.4 & P1.5 to outputs
  P1SEL = 0x32;                   // P1.1, P1.4 & P1.5 functions to
--------------------------output

Hi Martin,
there is a cool feature implemented! The crastal oscillator is 
checked if it is stable working. If not the controller uses 
automatically the integrated DCO clock for the CPU. 
So crystal failure doesn't stop the application.

What you have to do is to clear the OFIFG bit in the Controll 
register IFG1. After a wait loop you have to check if the
OFIFG Flag was set again. If so there is a problem with 
the oscillator. If it is still reset it means the oscillator
is working. 

Best regards,
            Chris


--- In msp430@y..., "expresso22003" <mfischer@h...> wrote:
> Hi,
> 
> I'm currently using an F449 with one 32kHz crystal on XT1 and one 
8Mhz
> crystal on XT2. I used a snipset of Code from TI
to use both 
crystals.
> 
> My problem: MCLK is only 1.034 Mhz (probably DCO?) but SMCLK is 
8MHz!
> I did have selected the SELM switch but it does
not appear to work..
> 
> Somebody has any suggestions?
> 
> Thanks
> Martin
>  
> --------------------------------
-
>   WDTCTL = WDTPW + WDTHOLD;       // stop watchdog
timer
>   FLL_CTL0 = XCAP18PF;            // set load capacitance for 32k 
xtal
>   FLL_CTL1 = FLL_CTL1 & ~XT2OFF;  // clear bit
= high freq xtal on
> 
>   do                              // loop until flag is clear
>   {
>     FLL_CTL0 = FLL_CTL0 & ~XT2OF; // clear high freq oscillator 
fault flag
>     for (i = 50000; i; i--);      // delay for
crystal to start and
> FLL to lock
>   }
>   while (FLL_CTL0 & XT2OF);       // test high freq oscillator 
fault flag
>   
>                                   // if flag remained clear then -  
>   FLL_CTL1 = SELS;                // switch SMCLK = HF 
xtal          
>       
>   FLL_CTL1 |= SELM_XT2;
>   P1DIR = 0x32;                   // P1.1, P1.4 & P1.5 to outputs
>   P1SEL = 0x32;                   // P1.1, P1.4 & P1.5 functions to
> --------------------------output

The thing is that the oscillator is working (i measure the 8Mhz Clock on
SMCLK) but I can't switch it to the MCLK. Doesnt't matter what I do
with the SELM register, I still have the 1Mhz Clock from the DCO. 

The oscialltor flag is already checked with the code snipset i provided.

Anyway I use now a workaround with the 32kHz crystal and the FLL
"upclocking" to 8Mhz, that seems to work.

Martin

--- In msp430@msp4..., "hchris8000" <hchris8000@y...> wrote:
> Hi Martin,
> there is a cool feature implemented! The crastal oscillator is 
> checked if it is stable working. If not the controller uses 
> automatically the integrated DCO clock for the CPU. 
> So crystal failure doesn't stop the application.
> 
> What you have to do is to clear the OFIFG bit in the Controll 
> register IFG1. After a wait loop you have to check if the
> OFIFG Flag was set again. If so there is a problem with 
> the oscillator. If it is still reset it means the oscillator
> is working. 
> 
> Best regards,
>             Chris
> 
> 
> --- In msp430@y..., "expresso22003" <mfischer@h...> wrote:
> > Hi,
> > 
> > I'm currently using an F449 with one 32kHz crystal on XT1 and one

> 8Mhz
> > crystal on XT2. I used a snipset of Code from TI to use both 
> crystals.
> > 
> > My problem: MCLK is only 1.034 Mhz (probably DCO?) but SMCLK is 
> 8MHz!
> > I did have selected the SELM switch but it does not appear to work..
> > 
> > Somebody has any suggestions?
> > 
> > Thanks
> > Martin
> >  
> > --------------------------------
> -
> >   WDTCTL = WDTPW + WDTHOLD;       // stop watchdog timer
> >   FLL_CTL0 = XCAP18PF;            // set load capacitance for 32k 
> xtal
> >   FLL_CTL1 = FLL_CTL1 & ~XT2OFF;  // clear bit = high freq xtal on
> > 
> >   do                              // loop until flag is clear
> >   {
> >     FLL_CTL0 = FLL_CTL0 & ~XT2OF; // clear high freq oscillator 
> fault flag
> >     for (i = 50000; i; i--);      // delay for crystal to start and
> > FLL to lock
> >   }
> >   while (FLL_CTL0 & XT2OF);       // test high freq oscillator 
> fault flag
> >   
> >                                   // if flag remained clear then -  
> >   FLL_CTL1 = SELS;                // switch SMCLK = HF 
> xtal          
> >       
> >   FLL_CTL1 |= SELM_XT2;
> >   P1DIR = 0x32;                   // P1.1, P1.4 & P1.5 to outputs
> >   P1SEL = 0x32;                   // P1.1, P1.4 & P1.5 functions
to
> > --------------------------output