msp430x24x_mpy_04.s43

来自「步进电机驱动程序msp430f247单片机」· S43 代码 · 共 44 行

;******************************************************************************
;   MSP430x24x Demo - 8x8 Signed Multiply
;
;   Description: Hardware multiplier is used to multiply two numbers.
;   The calculation is automatically initiated after the second operand is
;   loaded. Results are stored in RESLO, RESHI and SUMEXT = FFFF if result is
;   negative, SUMEXT = 0 otherwise. (In this eg: 0x04*0x84 = FFFFFE10)
;
;   ACLK = 32.768kHz, MCLK = SMCLK = default DCO
;
;                 MSP430x24x
;             -----------------
;         /|\|                 |
;          | |                 |
;          --|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.b   #004h,&0132h            ; Load first operand -signed mult
            sxt     &0132h                  ; Extend sign
            mov.b   #084h,&0138h            ; Load second operand
            sxt     &0138h                  ; Extend sign
            bis.w   #LPM4,SR                ; LPM4
            nop                             ; set BREAKPOINT here

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