msp430x42x0_ta_04.s43

MSP430F42x0.zip c语言 例程打包

;******************************************************************************
;   MSP430x42x0 Demo - Timer_A, Toggle P1.0, Overflow ISR, 32kHz ACLK
;
;  Description: Toggle P1.0 using software and the Timer_A overflow ISR.
;  In this example an ISR triggers when TA overflows. Inside the ISR P1.0
;  is toggled. Toggle rate is exactly 0.5Hz. Proper handling the TAIV
;  interrupt vector is demonstrated.
;  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
;  //* An external watch crystal between XIN & XOUT is required for ACLK *//	
;
;           MSP430F4270
;         ---------------
;     /|\|            XIN|-
;      | |               | 32kHz
;      --|RST        XOUT|-
;        |               |
;        |           P1.0|-->LED
;
;  L. Westlund / S. Karthikeyan
;  Texas Instruments Inc.
;  June 2005
;  Built with IAR Embedded Workbench Version: 3.30A
;*****************************************************************************
#include  <msp430x42x0.h>
;------------------------------------------------------------------------------
            ORG     08000h                  ; 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   #001h,&P1DIR            ; P1.0 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   #001h,&P1OUT            ; Toggle P1.0
            reti                            ; Return from overflow ISR		
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            ORG     0FFEAh                  ; Timer_AX Vector
            DW      TAX_ISR                 ;
            END