fet440_fll_02.s43

来自「MSP430的汇编开发例子」· S43 代码 · 共 52 行

;*******************************************************************************
;   MSP-FET430P440 Demo - FLL+, Runs Internal DCO at 8MHz
;
;   Description: This program demonstrates setting the internal
;   DCO to run at 8MHz with auto-calibration by the FLL+.
;   ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
;   //* An external watch crystal between XIN & XOUT is required for ACLK *//	
;
;                MSP430F449
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |        P1.1/MCLK|--> MCLK = 8Mhz
;            |                 |
;            |        P1.5/ACLK|--> ACLK = 32khz
;            |                 |
;
;   M. Buccini
;   Texas Instruments Inc.
;   Feb 2005
;   Built with IAR Embedded Workbench Version: 3.21A
;******************************************************************************
#include  <msp430x44x.h>
;-------------------------------------------------------------------------------
            ORG     01100h                  ; Program Start
;-------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stackpointer
SetupWDT    mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
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
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
                                            ;
;-------------------------------------------------------------------------------
;           Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            END