fet430_ta01.asm

application programme for fet430 in assembly language

;*******************************************************************************
;   MSP-FET430P430 Demo - Timer_A Toggle P5.1, CCR0 Contmode ISR, DCO SMCLK
;
;   Description; Toggle P5.1 using using software and TA_0 ISR. Toggle rate is
;   set at 50000 DCO/SMCLK cycles. Default DCO frequency used for TACLK.
;   During the TA_0 ISR P5.1 is toggled and 50000 clock cycles are added to
;   CCR0.  TA_0 ISR is triggered exactly 50000 cycles. CPU is normally off and
;   used only during TA_ISR.
;   ACLK = n/a, MCLK = SMCLK = TACLK = default DCO
;
;                MSP430FG439
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;
;   M.Buccini
;   Texas Instruments, Inc
;   September 2004
;   Built with CCE for MSP430 Version: 1.00
;*******************************************************************************
            .cdecls C,LIST,"msp430xG43x.h"  ; Include device header file

;-------------------------------------------------------------------------------
            .text                           ; Progam Start
;-------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stack pointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output
SetupC0     mov.w   #CCIE,&CCTL0            ; CCR0 interrupt enabled
            mov.w   #50000,&CCR0            ;
SetupTA     mov.w   #TASSEL_2+MC_2,&TACTL   ; SMCLK, contmode
                                            ;
Mainloop    bis.w   #CPUOFF+GIE,SR          ; CPU off, interrupts enabled
            nop                             ; Required for debugger
                                            ;
;-------------------------------------------------------------------------------
TA0_ISR;    Toggle P5.1
;-------------------------------------------------------------------------------
            xor.b   #002h,&P5OUT            ; Toggle P5.1
            add.w   #50000,&CCR0            ; Add Offset to CCR0
            reti                            ;
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .sect   ".int06"                ; Timer_A0 Vector
            .short  TA0_ISR                 ;

            .end