msp430x24x_mpy_08.s43

步进电机驱动程序msp430f247单片机

;******************************************************************************
;   MSP430x24x Demo - 8x8 Signed Multiply Accumulate
;
;   Description: Hardware multiplier is used to multiply two numbers.
;   The calculation is automatically initiated after the second operand is
;   loaded.  A second multiply accumulate operation is performed after that.
;   Results are stored in RESLO and RESHI.  SUMEXT contains the extended sign of
;   result.
;
;   ACLK = 32.768kHz, MCLK = SMCLK = default DCO
;
;                 MSP430x249
;             -----------------
;         /|\|                 |
;          | |                 |
;          --|RST              |
;            |                 |
;            |                 |
;
;   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
            mov.w   #1234h,&MPY             ; Load first operand - unsigned mult
            mov.w   #5678h,&OP2             ; Load second operand

            mov.w   #12h,&MACS              ; Load first operand - signed MAC
            sxt     &MACS                   ; Extend sign
            mov.w   #96h,R15                ; Move to register
            sxt     R15                     ; Extend sign
            mov.w   R15,&OP2                ; Load second operand

            bis.w   #LPM4,SR                ; LPM4
            nop                             ; Set breakpoint here

;------------------------------------------------------------------------------
            COMMON  INTVEC                  ; Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     RESET_VECTOR            ; MSP430 RESET Vector
            DW      RESET                   ;
            END