fet440_tb_01.s43

MSP430 code examples

;******************************************************************************
;   MSP-FET430P440 Demo - Timer_B, Toggle P5.1, CCR0 Cont. Mode ISR, DCO SMCLK
;
;   Description: Toggle P5.1 using software and TB_0 ISR. Toggle rate is set
;   at 50000 SMCLK cycles. SMCLK provides clock source for TBCLK. During the
;   TB_0 ISR, P5.1 is toggled and 50000 additional cycles are added to CCR0.
;   CPU is used only during TB_ISR.
;   ACLK = n/a, MCLK = SMCLK = TBCLK = default DCO
;
;                 MSP430F449
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P5.1|-->LED
;
;   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
SetupP5     bis.b   #002h,&P5DIR            ; P5.1 output
SetupC0     mov.w   #CCIE,&TBCCTL0          ; CCR0 interrupt enabled
            mov.w   #50000,&TBCCR0          ;
SetupTB     mov.w   #TBSSEL_2+MC_2,&TBCTL   ; SMCLK, contmode
                                            ;						
Mainloop    bis.w   #CPUOFF+GIE,SR          ; CPU off, interrupts enabled
            nop                             ; Required only for debugger
                                            ;
;------------------------------------------------------------------------------
TB0_ISR;    Toggle P5.1
;------------------------------------------------------------------------------
            xor.b   #002h,&P5OUT            ; Toggle P5.1
            add.w   #50000,&TBCCR0          ; Add Offset to CCR0
            reti                            ;		
                                            ;
;-----------------------------------------------------------------------------
;           Interrupt Vectors
;-----------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            ORG     0FFFAh                  ; Timer_B0 Vector
            DW      TB0_ISR                 ;
            END