fet410_ta_04.asm

来自「MSP430FX41x Assembler Examples Code,Comp」· 汇编 代码 · 共 56 行

;******************************************************************************
;   MSP-FET430P410 Demo - Timer_A, Toggle P5.1, Overflow ISR, 32kHz ACLK
;
;   Description: Toggle P5.1 using software and the Timer_A overflow ISR.
;   In this example an ISR triggers when TA overflows. Inside the ISR P5.1
;   is toggled. Toggle rate is exactly 0.5Hz.
;   ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
;   ;* An external watch crystal between XIN & XOUT is required for ACLK *//	
;
;                MSP430F413
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;
;   M. Buccini / S. Karthikeyan
;   Texas Instruments Inc.
;   May 2005
;   Built with Code Composer Essentials Version 1.0
;******************************************************************************
 .cdecls C,LIST,  "msp430x41x.h"
;------------------------------------------------------------------------------
            .text                  ; Program Start
;------------------------------------------------------------------------------
RESET       mov.w   #300h,SP                ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupFLL    bis.b   #XCAP14PF,&FLL_CTL0     ; Configure load caps
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output
SetupTA     mov.w   #TASSEL_1+MC_2+TAIE,&TACTL  ; ACLK, cont. mode, interrupt
                                            ;													
Mainloop    bis.w   #LPM3+GIE,SR            ; Enter LPM3, interrupts enabled
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
TAX_ISR;    Common ISR for CCR1-4 and overflow
;------------------------------------------------------------------------------
            add.w   &TAIV,PC                ; Add Timer_A offset vector
            reti                            ; CCR0 - no source
            reti                            ; CCR1
            reti                            ; CCR2
            reti                            ; CCR3
            reti                            ; CCR4
TA_over     xor.b   #002h,&P5OUT            ; Toggle P5.1
            reti                            ; Return from overflow ISR		
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            .sect     ".reset"                  ; RESET Vector
            .short  RESET                   ;
            .sect   ".int05"                  ; Timer_AX Vector
            .short  TAX_ISR                 ;
            .end