Part Number:MSP430F5324
Hello there,
We are currently working with the following code on the MSP430F5324 to set up the MCLK and then change the frequency from 1.5MHz to 2.0MHz and back and fourth.
bis.w #SCG0,SR ; Disable the FLL control loop
clr.w &UCSCTL0 ; Set lowest possible DCOx, MODx
mov.w #DCORSEL_3,&UCSCTL1 ; 4.9 MHz nominal DCO
mov.w #FLLD_1 + 45,&UCSCTL2 ; Set DCO Multiplier for 2.00MHz
; (N + 1) * FLLRef = Fdco
; (45 + 1) * 38K = 2.00MHz
; Set FLL Div = fDCOCLK/2
bic.w #SCG0,SR ; Enable the FLL control loop
nop
nop
nop
nop
nop
mov.w #0x63AF,R15
delay_L3 add.w #0xFFFF,R15
jc delay_L3
; Loop until XT1,XT2 & DCO stabilizes
do_while4
bic.w #XT2OFFG + XT1LFOFFG + DCOFFG,&UCSCTL7
; Clear XT2,XT1,DCO fault flags
bic.w #OFIFG,&SFRIFG1 ; Clear fault flags
bit.w #OFIFG,&SFRIFG1 ; Test oscillator fault flag
jc do_while4
Our question is whether or not we can just change the value '45' in the line bolded or if it is necessary to rerun the whole code loop again in order to accomplish this type of switching? Can you comment?
Thanks so much for your help!
-Amanda
