msp430x11x1_p2_poll.asm

MSP430X11x1 Assembler Examples Code,Composer Essentials Code Examples

;*******************************************************************************
;   MSP430x11x1 Demo - Software Poll P2.0, .set P1.0 if P2.0 = 1
;
;   Description: Poll P2.0 in a loop, if hi P1.0 is set, if low, P1.0 reset.
;   ACLK = n/a, MCLK = SMCLK = default DCO ~800k
;
;                 MSP430F1121
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;      /|\   |                 |
;       --o--| P2.0        P1.0|-->LED
;      \|/
;
;   M. Buccini / Z. Albus
;   Texas Instruments Inc.
;   May 2005
;   Built with Code Composer Essentials Version: 1.0
;*******************************************************************************
 .cdecls C,LIST,  "msp430x11x1.h"
;-------------------------------------------------------------------------------
            .text                           ;
;-------------------------------------------------------------------------------
RESET       mov.w   #300h,SP                ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
                                            ;				          			
Mainloop    bit.b   #001h,&P2IN             ; P2.0 hi/low?
            jc      ON                      ; jmp--> P2.0 is set
                                            ;
OFF         bic.b   #001h,&P1OUT            ; P1.0 = 0 / LED OFF
            jmp     Mainloop                ;
ON          bis.b   #001h,&P1OUT            ; P1.0 = 1 / LED ON
            jmp     Mainloop                ;
                                            ;
;-------------------------------------------------------------------------------
;           Interrupt Vectors
;-------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .end