; --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, PWM TA1-2, Up/Down Mode, 32kHz ACLK
;
;   Description: This program generates one PWM output on P1.2 using
;   Timer_A configured for up/down mode. The value in CCR0, 128, defines
;   the PWM period/2 and the value in CCR1 the PWM duty cycle.
;   Using 32kHz ACLK as TACLK, the timer period is 7.8ms with a 75% duty
;   cycle on P1.2. Normal operating mode is LPM3.
;   ACLK = TACLK = LFXT1 = 32768Hz, MCLK = default DCO.
;   //* External watch crystal on XIN XOUT is required for ACLK *//	
;
;                MSP430F20xx
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |         P1.2/TA1|--> CCR1 - 75% PWM
;
;   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   #00Ch,&P1DIR            ; P1.2 and P1.3 output
            bis.b   #00Ch,&P1SEL            ; P1.2 and P1.3 TA1/2 otions
SetupC0     mov.w   #128,&CCR0              ; PWM Period/2
SetupC1     mov.w   #OUTMOD_6,&CCTL1        ; CCR1 toggle/set
            mov.w   #32,&CCR1               ; CCR1 PWM Duty Cycle	
SetupTA     mov.w   #TASSEL_1+MC_3,&TACTL   ; ACLK, updown mode
                                            ;					
Mainloop    bis.w   #LPM3,SR                ; Enter LPM3
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            .sect   ".reset"                ; MSP430 RESET Vector
            .short  RESET                   ;
            .end