fet440_fll01.s43

msp430f440的头程序

#include    "msp430x44x.h";  MSP430x44x Standard Definitions
;*******************************************************************************
;   MSP-FET430P440 Demo - FLL+ clock, Runs internal DCO at 2.4576Mhz 
;
;   Description This program demostrates setting the internal DCO to run at
;   2.4576Mhz with auto-calibration by the FLL+.
;   ACLK = LFXT1 = 32768, MCLK = SMCLK = DCO = (n+1) x ACLK 
;   //*An external watch crystal is required on XIN/XOUT for ACLK*//	  
;
;                MSP430F449
;             -----------------
;         /|\|              XIN|-  
;          | |                 | 32khz xtal
;          --|RST          XOUT|-
;            |                 |
;            |             P1.1|--> MCLK = 2.4576Mhz
;            |                 |
;            |             P1.5|--> ACLK = 32khz
;            |                 |
;
;   Brian Merritt - meb
;   Texas Instruments Inc.
;   February 2002
;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize '449 stackpointer
SetupWDT    mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; stop WDT
SetupFLL2   bis.b   #FN_2,&SCFI0            ; x2 DCO, 4MHz nominal DCO  
            bis.b   #XCAP18PF,&FLL_CTL0     ; set load capacitance for xtal
            mov.b   #74,&SCFQCTL            ; (74+1) x 32768 = 2.4576Mhz
                                            ;
SetupPorts  bis.b   #022h,&P1DIR            ; P1.1 & P1.5 to output direction
            bis.b   #022h,&P1SEL            ; P1.1 & P1.5 to output MCLK & ACLK
                                            ;
Mainloop    jmp     Mainloop                ; loop with CPU running
                                            ;
;----------------------------------------------------------------------------- 
;           MSP430F43x/44x interrupt vectors used         
;----------------------------------------------------------------------------- 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            END