fet440_tb_11.s43

MSP430 code examples

;******************************************************************************
;   MSP-FET430P440 Demo - Timer_B, PWM TB1-6 Up Mode, 32kHz ACLK
;
;   Description: This program outputs six PWM signals on P2.2,3 and P3.4-7
;   using Timer_B configured for up mode. The value in CCR0 defines the PWM
;   period and the values in CCR1-6 the PWM duty cycles. Using 32kHz ACLK as
;   TBCLK, the timer period is 15.6ms. Normal operating mode is LPM3.
;   ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
;   //* An external watch crystal between XIN & XOUT is required for ACLK *//	
;
;                MSP430F449
;             -----------------
;         /|\|              XIN|-
;          | |                 | 32kHz
;          --|RST          XOUT|-
;            |                 |
;            |         P2.2/TB1|--> CCR1 - 75% PWM
;            |         P2.3/TB2|--> CCR2 - 25% PWM
;            |         P3.4/TB3|--> CCR3 - 12.5% PWM
;            |         P3.5/TB4|--> CCR4 - 6.25% PWM
;            |         P3.6/TB5|--> CCR5 - 3.125% PWM
;            |         P3.7/TB6|--> CCR6 - 1.5625% PWM
;
;   M. Buccini
;   Texas Instruments Inc.
;   Feb 2005
;   Built with IAR Embedded Workbench Version: 3.21A
;******************************************************************************
#include  <msp430x44x.h>
;------------------------------------------------------------------------------
            ORG     01100h                  ; Program Start
;------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupPx     bis.b   #0ch,&P2DIR             ; P2.2-P2.3 output
            bis.b   #0ch,&P2SEL             ; P2.2-P2.3 TB1-6 options
            bis.b   #0F0h,&P3DIR            ; P3.4-P3.7 output
            bis.b   #0F0h,&P3SEL            ; P3.4-P3.7 TB1-6 options
SetupC0     mov.w   #512-1,&TBCCR0          ; PWM Period
SetupC1     mov.w   #OUTMOD_7,&TBCCTL1      ; CCR1 reset/set
            mov.w   #384,&TBCCR1            ; CCR1 PWM Duty Cycle	
SetupC2     mov.w   #OUTMOD_7,&TBCCTL2      ; CCR2 reset/set
            mov.w   #192,&TBCCR2            ; CCR2 PWM duty cycle	
SetupC3     mov.w   #OUTMOD_7,&TBCCTL3      ; CCR3 reset/set
            mov.w   #96,&TBCCR3             ; CCR3 PWM duty cycle	
SetupC4     mov.w   #OUTMOD_7,&TBCCTL4      ; CCR4 reset/set
            mov.w   #48,&TBCCR4             ; CCR4 PWM duty cycle	
SetupC5     mov.w   #OUTMOD_7,&TBCCTL5      ; CCR5 reset/set
            mov.w   #24,&TBCCR5             ; CCR5 PWM duty cycle	
SetupC6     mov.w   #OUTMOD_7,&TBCCTL6      ; CCR6 reset/set
            mov.w   #12,&TBCCR6             ; CCR6 PWM duty cycle	
SetupTB     mov.w   #TBSSEL_1+MC_1,&TBCTL   ; ACLK, upmode
                                            ;					
Mainloop    bis.w   #CPUOFF,SR              ; CPU off
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            END