Hello All,
I have a custom board, running an MSP430F47183. When I measure the MCLK pin with a scope, it shows the frequency to fluctuate anywhere between 33 MHz and 37 MHz. Is this reasonable? And is there a way I can make this slightly more accurate? I'm still in the process of understanding FLL, so I may have some more questions on that later. But what can I expect for clock jitter? I have an external 32 kHz clock sourcing MCLK.
This is my clock setup:
SCFI0 = FN_4 | FLLD1 | FLLD_8; // FN_2 (1.3 to 12.1 MHz); D = 2
//SCFI0 = FN_2 | FLLD1 | FLLD_1;
FLL_CTL0 = DCOPLUS | XCAP0PF; // DCO+ set, fDCOCLK = D x (N + 1) x fACLK, 0pF
FLL_CTL1 &= ~SELS;
SCFQCTL = 127;
SCFQCTL |= 0x80;
Thanks,
Ehsun