fet140_tb_03.s43

MSP430F135的TB操作代码,绝对的真实可行.放心下载

;******************************************************************************
;   MSP-FET430P140 Demo - Timer_B, Toggle P1.0, Overflow ISR, DCO SMCLK
;
;   Description: Toggle P1.0 using software and Timer_B overflow ISR.
;   In this example an ISR triggers when TB overflows. Inside the TB
;   overflow ISR P1.0 is toggled. Toggle rate is approximatlely 12Hz.
;   ACLK = n/a, MCLK = SMCLK = TBCLK = default DCO ~800kHz
;
;                MSP430F149
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;   M. Buccini
;   Texas Instruments Inc.
;   Feb 2005
;   Built with IAR Embedded Workbench Version: 3.21A
;******************************************************************************
#include  <msp430x14x.h>
;------------------------------------------------------------------------------
            ORG     01100h                  ; Progam Start
;------------------------------------------------------------------------------
RESET       mov.w   #0A00h,SP               ; Initialize stackpointer
StopWDT     mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP1     bis.b   #001h,&P1DIR            ; P1.0 output
SetupTB     mov.w   #TBSSEL_2+MC_2+TBIE,&TBCTL  ; SMCLK, contmode, interrupt
                                            ;						
Mainloop    bis.w   #CPUOFF+GIE,SR          ; CPU off, interrupts enabled
            nop                             ; Required for debugger
                                            ;
;------------------------------------------------------------------------------
TBX_ISR;    Common ISR for TBCCR1-6 and overflow
;------------------------------------------------------------------------------
            add.w   &TBIV,PC                ; Add Timer_B offset vector
            reti                            ; TBCCR0 - no source
            reti                            ; TBCCR1
            reti                            ; TBCCR2
            reti                            ; TBCCR3
            reti                            ; TBCCR4
            reti                            ; TBCCR5
            reti                            ; TBCCR6
TB_over     xor.b   #001h,&P1OUT            ; Toggle P1.0
            reti                            ; Return from overflow ISR		
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     0FFF8h                  ; Timer_BX Vector
            DW      TBX_ISR                 ;
            END