Hi,
i'ts important to have a supply voltage which is not too low.
For 8 MHz you need a little more than 3 V; for overclocking to 16 MHz more than
4 V.
Rolf
mspgcc-users@lists.sourceforge.net schrieb am 23.06.04 16:49:36:
>
> Hi
>
> I've got a 7.372MHz Crystal on XT1 with the attached code...
>
> void startXTAL(void) {
>
> unsigned int j;
> BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL
>
> do {
> IFG1 &= ~OFIFG; // Clear OSCFault flag
> for (j = 0xFF; j > 0; j--); // Time for flag to set
> } while ((IFG1 & OFIFG) == OFIFG);
>
> BCSCTL2 |= SELM1+SELM0; // MCLK = LFXT1 (safe)
> }
>
> Kind regards
> Riaan
>
> -----Original Message-----
> From: mspgcc-users-ad...@lists.sourceforge.net
> [mailto:mspgcc-users-ad...@lists.sourceforge.net] On Behalf Of Jens Prüfer
> Sent: 23 June 2004 15:58
> To: mspgcc-users@lists.sourceforge.net
> Subject: [Mspgcc-users] slightly off topic: msp430f149 FLL question
>
>
> Hello,
>
> I got TI's msp430f149 development board that comes with the JTAG interface, a
> ZIF socket for the QFP64 chips and a lose 32.768 kHz crystal. Has anyone ever
> gotten the system up to 8 MHz using that kit? All examples I can find are
> utilizing a seperate 8 MHz crystal on the XT2 input.
>
> However, the documentation states, it is possible to use the LF crystal
> instead and set up some registers with correct multipliers etc. to generate
> the 8 MHz MCLK. Unfortunately the documentation is incomprehensible to me and
> there is no sample code whatsoever how to set everything up.
>
> Has anyone here ever used the FLL got it up and running? I'd appreciate some
> documented code snippet how and which registers to set up. I already see the
> difficulty getting the right load capacitors set up because the shipped
> crystal requires 12.5 pF.
>
> I wish TI had better documentation on that clock FLL with all registered and
> possible settings listed in a well documented table.
>
> Cheers
>
> Jens
>
>
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