msp430x24x_1.s43

来自「步进电机驱动程序msp430f247单片机」· S43 代码 · 共 42 行

;*******************************************************************************
;  MSP430x24x Demo - Software Toggle P1.0
;
;  Description: Toggle P1.0 by xor'ing P1.0 inside of a software loop.
;  ACLK= n/a, MCLK= SMCLK= default DCO ~1.045MHz
;
;                MSP430x24x
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;  B. Nisarga
;  Texas Instruments Inc.
;  September 2007
;  Built with IAR Embedded Workbench Version: 3.42A
;******************************************************************************
#include "msp430x24x.h"
;-------------------------------------------------------------------------------
            RSEG    CSTACK                  ; Define stack segment
;-------------------------------------------------------------------------------
            RSEG    CODE                    ; Assemble to Flash memory
;-------------------------------------------------------------------------------
RESET       mov.w   #SFE(CSTACK),SP         ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
                                            ;
Mainloop    xor.b   #001h,&P1OUT            ; Toggle P1.0
Wait        mov.w   #050000,R15             ; Delay to R15
L1          dec.w   R15                     ; Decrement R15
            jnz     L1                      ; Delay over?
            jmp     Mainloop                ; Again
                                            ;
;-------------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;-------------------------------------------------------------------------------
            ORG     RESET_VECTOR            ; POR, ext. Reset
            DW      RESET
            END