;*******************************************************************************
;   MSP430F20xx Demo - Software Toggle P1.0, MCLK = VLO/8
;
;   Description; Pulse P1.0 with a 1/100 active duty cycle using software.
;   Ultra-low frequency ~ 1.5kHz, ultra-low power active mode demonstrated.
;   ACLK = VL0, MCLK = VLO/8 ~1.5kHz, SMCLK = n/a
;
;                MSP430F20xx
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;   M. Buccini / L. Westlund
;   Texas Instruments Inc.
;   October 2005
;   Built with IAR Embedded Workbench Version: 3.40A
;*******************************************************************************
#include  "msp430x20x3.h"
;-------------------------------------------------------------------------------
            ORG     0F800h                  ; Program Reset
;-------------------------------------------------------------------------------
RESET       mov.w   #0280h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupBC     bis.b   #LFXT1S_2,&BCSCTL3      ; LFXT1 = VLO
SetupOsc    bic.b   #OFIFG,&IFG1            ; Clear OSC fault flag
            bis.w   #SCG1+SCG0,SR           ; Stop DCO
            bis.b   #SELM_3+DIVM_3,&BCSCTL2 ; MCLK = LFXT1/8
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
                                            ;					
Mainloop    bis.b   #001h,&P1OUT            ; Set P1.0
Delay1      mov.w   #020,R15                ; Delay to R15
L1          dec.w   R15                     ;
            jnz     L1                      ;
            bic.b   #001h,&P1OUT            ; Reset P1.0
Delay2      mov.w   #02000,R15              ; Delay to R15
L2          dec.w   R15                     ;
            jnz     L2                      ;
            jmp     Mainloop                ; Again
                                            ;
;-------------------------------------------------------------------------------
;           Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            END