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how to set the ACLK clock

ASHISH PATEL
Prodigy 230 points
Other Parts Discussed in Thread: MSP430F2616

my problem is that i want to run ACLK and SMCLK both on controller MSP430F2616  but i am not able to run it

i give all setting for that

WDTCTL = WDTPW | WDTHOLD;
 
  _BIS_SR(OSCOFF);
   BCSCTL1 |= 0x00;
   BCSCTL1 |= LFXT1S_0 + XTS ;
  BCSCTL1 &= ~(XT2OFF);
 
 // BCSCTL2 |= SELM_2 + SELS + DIVS_0;
  BCSCTL3 |= XT2S_2 + XCAP_1  + LFXT1OF ;
  do
  {
  IFG1 &= ~OFIFG;                           // Clear OSCFault flag
  for (i = 0x0FF; i > 0; i--);             // Time for flag to set
  }
  while ((IFG1 & OFIFG));                   // OSCFault flag still set?
 
  BCSCTL2 |= SELM_2 + SELS + DIVS_2 + DIVM_0  ;

using this i got the MCLK and SMCLK but using crystal 5Mhz i want to generate the ACLK
but its not coming properly  its varying not coming constant

also i set the all PORT direction and all those thing plz help me 

  • Guru 92251 points

    ASHISH PATEL said:
    also i set the all PORT direction and all those thing plz help me

    To use the XT2 crystal oscillator the P8SEL.6 and P8SEL.7 bits need to be set (see the Port P8 (P8.6), Input/Output With Schmitt Trigger and Port P8 (P8.7), Input/Output With Schmitt Trigger diagrams in the MSP430F2616 datasheet SLAS541J)

    i.e.the following code is required attempting to start the oscillator: 

    P8SEL |= BIT7 + BIT6; 

  • in reply to Chester Gillon
    Prodigy 230 points

    Whatever ur ans is right but y controller is 60 Pins and also i got yhe XT2 output but i m not able to switch on the XT1 in any mode not in low frequency  mode or high 

    frequency mode

    i set the pin of ACLK both that P2.0 and also P5.6 using this P2SEL |= 0x01; P2DIR |= 0x01; P5SEL |= BIT6; P5DIR |= BIT6 then also i didn't get it .

  • Guru 92251 points

    ASHISH PATEL said:
    using this i got the MCLK and SMCLK but using crystal 5Mhz i want to generate the ACLK but its not coming properly  its varying not coming constant

    Can you clarify if a 5MHz crystal is connected to the XT1 and/or XT2 crystal oscillator?

  • Guru 58965 points

    (1) There is no 60-pin MSP430F2616. You must meant 64-pin.

    (2) Your statement:  _BIS_SR(OSCOFF); is wrong. You must delete that line.

    (3) Your statement: BCSCTL1 |= 0x00; is useless. You should delete that line.

    (4) The LFXT1S_0 part of your statement:  BCSCTL1 |= LFXT1S_0 + XTS ;  is inappropriate. You should edit that part out.
      
    (5) Your statement: BCSCTL3 |= XT2S_2 + XCAP_1  + LFXT1OF ; is wrong. You must change it to: BCSCTL3 = XT2S_2 + LFXT1S_2;

    (6) XT2 cannot be used to source ACLK and is enabled but not used in the above code. XT1 could and is selected as ACLK in the above code.

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