fet140_nmi.s43

来自「基于IAR Workbench for MSP430 的汇编语言例程」· S43 代码 · 共 56 行

;******************************************************************************
;   MSP-FET430P140 Demo - BasicClock Configure RST/NMI as NMI
;
;   Deccription: Configure RST/NMI as NMI, hi/lo edge. Flash P1.0  inside of
;   NMI_ISR if NMI occurs. General enable interrupt in status register does
;   not need to be set for NMI. NMIIE does need to be reset, as NMI_ISR 
;   automatically clears NMI enable to prevent unintentional stack overflow
;   that could result from, bounch or uncontroller NMI's.
;   ACLK = n/a, MCLK = SMCLK = DCO ~ 800k
; 
;                MSP430F149
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;
;   M.Buccini
;   Texas Instruments, Inc
;   February 2004
;******************************************************************************
#include  "msp430x14x.h"
;----------------------------------------------------------------------------- 
            ORG     01100h                  ; Program Start
;----------------------------------------------------------------------------- 
RESET       mov.w   #0A00h,SP               ; Initialize 'x1x9 stackpointer
SetupWDT    mov.w   #WDTPW+WDTHOLD+WDTNMI+WDTNMIES,&WDTCTL  ; WDT off NMI hi/lo
            bis.b   #01h,&P1DIR             ; P1.0 = output
            bic.b   #01h,&P1OUT             ; P1.0 = reset
            bis.b   #NMIIE,&IE1             ; Enable NMI
                                            ;
Mainloop    jmp     Mainloop                ; Endless Loop
                                            ;
;----------------------------------------------------------------------------- 
NMI_ISR   ; Flash P1.0
;----------------------------------------------------------------------------- 
            bis.b   #01h,&P1OUT             ; P1.0 = set
Wait        push.w  #020000                 ; Delay value --> TOS
Wait1       dec.w   0(SP)                   ; Decrement TOS
            jnz	    Wait1                   ; Delay over?
            incd.w  SP                      ; Clean up stack
            bic.b   #01h,&P1OUT             ; P1.0 = reset
            bic.b   #NMIIFG,&IFG1           ; reclear NMI flag in case bounce
            bis.b   #NMIIE,&IE1             ; Re-enable NMI interrupt
            reti                            ; Done  
                                            ;
;----------------------------------------------------------------------------- 
;           Interrupt Vectors Used MSP430x1xx         
;----------------------------------------------------------------------------- 
            ORG     0FFFCh                  ; NMI vector
            DW      NMI_ISR                 ; 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            END