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; ******************************************************************************
;  
;                        MSP430 CODE EXAMPLE DISCLAIMER
; 
;  MSP430 code examples are self-contained low-level programs that typically
;  demonstrate a single peripheral function or device feature in a highly
;  concise manner. For this the code may rely on the device's power-on default
;  register values and settings such as the clock configuration and care must
;  be taken when combining code from several examples to avoid potential side
;  effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
;  for an API functional library-approach to peripheral configuration.
; 
; --/COPYRIGHT--
;*******************************************************************************
;   MSP430F20xx Demo - Basic Clock, Configure RST/NMI as NMI
;
;   Description: 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, bounce or uncontrolled NMI's.
;   ACLK = n/a, MCLK = SMCLK = Default DCO
;
;                MSP430F20xx
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;
;   P.Thanigai
;   Texas Instruments Inc.
;   May 2007
;   Built with Code Composer Essentials Version: 2.0
;*******************************************************************************
 .cdecls C,LIST,  "msp430.h"
;-------------------------------------------------------------------------------
            .def    RESET                   ; Export program entry-point to
                                            ; make it known to linker.

;------------------------------------------------------------------------------
            .text                           ; Progam Start
;------------------------------------------------------------------------------
RESET       mov.w   #0280h,SP               ; Initialize 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
;-----------------------------------------------------------------------------
            .sect   ".int14"                ; NMI vector
            .short  NMI_ISR                 ;
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .end