Good afternoon.
I am unable to get the above external 32kHz crystal (Abracon part) to work with the XT1 on the 5328. I have configured P2.2 as the SMCLK for verification and am monitoring with a scope. I have hung 24pF off of each side of the crystal to ground on the board layout. Using eqn 3 in SLAA322B and recognizing that clearing the XCAP bits gives me an extra 2pF I believe my effective load capacitance is around 13pF (datasheets says 12.5pF). My code settings are (see below): If I change UCS4 to 0x0444, I get my smclk out on pin 28 (~8mhz). Can someone give me an indication as to what I might be doing wrong.
UCSCTL3 = 0x0020;
UCSCTL4 = 0x0404;
__bis_SR_register(SCG0);
UCSCTL0 = 0x0000;
UCSCTL1 = DCORSEL_5;
UCSCTL2 = FLLD_1 + 244;
UCSCTL6 = 0xC1C1;
__bic_SR_register(SCG0);
__delay_cycles(375000);
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
SFRIFG1 &= ~OFIFG;
} while (SFRIFG1&OFIFG);