dco.s43

IIR filter - iir filtering more effective than FIR filter but not so stable

/******************************************************************************
;   Description: This code sets the MCLK frequency to 8 MHz. It assumes a 32768 Hz 
;                crystal is present at the LFXTL on the MSP430FG439 device
;
;   MSP430 Applications
;   Texas Instruments Inc.
;   August 2006
;   Built with IAR Embedded Workbench Version: 3.41A
;*******************************************************************************/
#include  <msp430x43x.h>
            public DCO
	    RSEG CODE
    
DCO:
SetupFLL2:  bis.b   #FN_4,&SCFI0            ; x2 DCO, 8MHz nominal DCO
            bis.b   #DCOPLUS+XCAP14PF,&FLL_CTL0 ; DCO+, configure load caps
            mov.b   #121,&SCFQCTL           ; (121+1) x 2 x 32768 = 7.99 MHz
            ret                             ; Return from subroutine
            END