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+; --COPYRIGHT--,BSD_EX
+;  Copyright (c) 2012, Texas Instruments Incorporated
+;  All rights reserved.
+; 
+;  Redistribution and use in source and binary forms, with or without
+;  modification, are permitted provided that the following conditions
+;  are met:
+; 
+;  *  Redistributions of source code must retain the above copyright
+;     notice, this list of conditions and the following disclaimer.
+; 
+;  *  Redistributions in binary form must reproduce the above copyright
+;     notice, this list of conditions and the following disclaimer in the
+;     documentation and/or other materials provided with the distribution.
+; 
+;  *  Neither the name of Texas Instruments Incorporated nor the names of
+;     its contributors may be used to endorse or promote products derived
+;     from this software without specific prior written permission.
+; 
+;  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+;  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+;  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+;  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+;  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+;  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+;  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+;  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+;  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+;  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+;  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+; 
+; ******************************************************************************
+;  
+;                        MSP430 CODE EXAMPLE DISCLAIMER
+; 
+;  MSP430 code examples are self-contained low-level programs that typically
+;  demonstrate a single peripheral function or device feature in a highly
+;  concise manner. For this the code may rely on the device's power-on default
+;  register values and settings such as the clock configuration and care must
+;  be taken when combining code from several examples to avoid potential side
+;  effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
+;  for an API functional library-approach to peripheral configuration.
+; 
+; --/COPYRIGHT--
+;*******************************************************************************
+;   MSP430F20xx Demo - Timer_A, Toggle P1.0, Overflow ISR, DCO SMCLK
+;
+;   Description: Toggle P1.0 using software and Timer_A overflow ISR.
+;   In this example an ISR triggers when TA overflows. Inside the TA
+;   overflow ISR P1.0 is toggled.
+;   Proper use of TAIV interrupt vector generator is demonstrated.
+;   ACLK = n/a, MCLK = SMCLK = TACLK = default DCO
+;
+;                MSP430F20xx
+;             -----------------
+;         /|\|              XIN|-
+;          | |                 |
+;          --|RST          XOUT|-
+;            |                 |
+;            |             P1.0|-->LED
+;
+;   P.Thanigai
+;   Texas Instruments Inc.
+;   May 2007
+;   Built with Code Composer Essentials Version: 2.0
+;*******************************************************************************
+ .cdecls C,LIST,  "msp430.h"
+;-------------------------------------------------------------------------------
+            .def    RESET                   ; Export program entry-point to
+                                            ; make it known to linker.
+
+;------------------------------------------------------------------------------
+            .text                           ; Progam Start
+;------------------------------------------------------------------------------
+RESET       mov.w   #0280h,SP               ; Initialize stackpointer
+StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
+SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
+SetupTA     mov.w   #TASSEL_2+MC_2+TAIE,&TACTL  ; SMCLK, contmode interrupt
+                                            ;						
+Mainloop    bis.w   #CPUOFF+GIE,SR          ; CPU off, 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
+;------------------------------------------------------------------------------
+            .sect   ".reset"                ; MSP430 RESET Vector
+            .short  RESET                   ;
+            .sect   ".int08"                ; Timer_AX Vector
+            .short  TAX_ISR                 ;
+            .end