;******************************************************************************
;   MSP-FET430P140 Demo - LPM3 Using WDT ISR, 32kHz ACLK
;
;   Description; This program operates MSP430 normally in LPM3, pulsing P1.0 
;   at 4 second intervals. WDT ISR used to wake-up system. All I/O configured 
;   as low outputs to eliminate floating inputs. Current consumption does 
;   increase when LED is powered on P1.0. Demo for measuring LPM3 current. 
;   ACLK= LFXT1/4= 32768/4, MCLK= SMCLK= default DCO
;   //*External watch crystal on XIN XOUT is required for ACLK*//	  
;
;                 MSP430F149
;             -----------------
;         /|\|              XIN|-  
;          | |                 | 32kHz  
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;   M.Buccini
;   Texas Instruments, Inc
;   January 2004
;******************************************************************************
#include  "msp430x14x.h"
;----------------------------------------------------------------------------- 
            ORG     01100h                  ; Program Start
;----------------------------------------------------------------------------- 
RESET       mov.w   #0A00h,SP               ; Initialize 'F149 stackpointer
SetupBC     bis.b   #DIVA_1,&BCSCTL1        ; ACLK/4 
SetupWDT    mov.w   #WDT_ADLY_1000,&WDTCTL  ; WDT 1s*4 Interval Timer 
            bis.b   #WDTIE,&IE1             ; Enable WDT Interrupt 
SetupP1     mov.b   #0FFh,&P1DIR            ; All P1.x Outputs
            clr.b   &P1OUT                  ; All P1.x Reset
SetupP2     mov.b   #0FFh,&P2DIR            ; All P2.x Outputs
            clr.b   &P2OUT                  ; All P2.x Reset
SetupP3     mov.b   #0FFh,&P3DIR            ; All P3.x Outputs
            clr.b   &P3OUT                  ; All P3.x Reset
SetupP4     mov.b   #0FFh,&P4DIR            ; All P4.x Outputs
            clr.b   &P4OUT                  ; All P4.x Reset
SetupP5     mov.b   #0FFh,&P5DIR            ; All P5.x Outputs
            clr.b   &P5OUT                  ; All P5.x Reset
SetupP6     mov.b   #0FFh,&P6DIR            ; All P6.x Outputs
            clr.b   &P6OUT                  ; All P6.x Reset
                                            ;                                                     
Mainloop    bis.w   #LPM3+GIE,SR            ; Enter LPM3, interrupts enabled
            bis.b   #001h,&P1OUT            ; Set P1.0
            push.w  #5000                   ; Delay to TOS
Pulse       dec.w   0(SP)                   ; Decrement TOS
            jnz     Pulse                   ; Delay done?
            bic.b   #001h,&P1OUT            ; Reset P1.0
            jmp     Mainloop                ; Again
                                            ;
;------------------------------------------------------------------------------
WDT_ISR  ;  Exit LPM3 on reti
;------------------------------------------------------------------------------
            bic.w   #LPM3,0(SP)             ; Clear LPM3 from TOS
            reti                            ;        
                                            ;
;----------------------------------------------------------------------------- 
;           Interrupt Vectors Used MSP430x13x/14x/15x/16x         
;----------------------------------------------------------------------------- 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            ORG     0FFF4h                  ; WDT Vector
            DW      WDT_ISR                 ; 
            END