fet140_dac12_03.s43

基于IAR Workbench for MSP430 的汇编语言例程

;******************************************************************************
;   MSP-FET430P140 Demo - DAC12.0 Output Voltage Ramp on P6.6  
;
;   Description; Using DAC12.0 and 2.5V ADC12REF reference with a gain of 1, 
;   ouput positive ramp on P6.6. Normal mode is LPM0 with CPU off.  WDT used
;   to provide ~0.5ms interrupt used to wake up the CPU and update the DAC 
;   with software. Use internal 2.5V Vref.
;   ACLK = n/a, SMCLK = MCLK = WDTCLK = default DCO ~ 800kHz. 
;   //* MSP430F169 Device Required*//
;
;                MSP430F169
;             -----------------
;         /|\|              XIN|-  
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |        DAC0/P6.6|--> Ramp_positive
;            |                 |
;
;   M.Buccini
;   Texas Instruments, Inc
;   January 2004
;******************************************************************************
#include  "msp430x16x.h"
;------------------------------------------------------------------------------ 
            ORG     01100h                  ; Progam Start 
;------------------------------------------------------------------------------ 
RESET       mov.w   #0A00h,SP               ; Initialize 'x1x9 stackpointer
SetupWDT    mov.w   #WDT_MDLY_0_064,&WDTCTL   ; WDT ~0.064ms interval timer 
            bis.b   #WDTIE,&IE1             ; Enable WDT interrupt 
SetupADC12  mov.w   #REF2_5V+REFON,&ADC12CTL0       ; Internal 2.5V ref on 
SetupDAC120 mov.w   #DAC12IR+DAC12AMP_5+DAC12ENC,&DAC12_0CTL ; Int ref gain 1
                                            ;						  
Mainloop    bis.w   #CPUOFF+GIE,SR          ; Enter LPM0, interrupts enabled
            inc.w   &DAC12_0DAT             ; Positive ramp
            and.w   #0FFFh,&DAC12_0DAT      ;   
            jmp     Mainloop                ;
                                            ;
;------------------------------------------------------------------------------
WDT_ISR  ;  Exit LPM0 on reti
;------------------------------------------------------------------------------
            bic.w   #CPUOFF,0(SP)           ; TOS = clear LPM0
            reti                            ;        
                                            ;
;----------------------------------------------------------------------------- 
;           Interrupt Vectors Used MSP430x15x/16x        
;----------------------------------------------------------------------------- 
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ; 
            ORG     0FFF4h                  ; WDT Vector
            DW      WDT_ISR                 ; 
            END