fet140_tb_01.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, CCR0 Cont. Mode ISR, DCO SMCLK
;
;   Description: Toggle P1.0 using software and TB_0 ISR. Toggles every
;   50000 SMCLK cycles. SMCLK provides clock source for TBCLK.
;   During the TB_0 ISR, P1.0 is toggled and 50000 clock cycles are added to
;   CCR0. TB_0 ISR is triggered every 50000 cycles. CPU is normally off and
;   used only during TB_ISR.
;   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
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 P1.0
;------------------------------------------------------------------------------
            xor.b   #001h,&P1OUT            ; Toggle P1.0
            add.w   #50000,&TBCCR0          ; Add Offset to CCR0
            reti                            ;		
                                            ;
;------------------------------------------------------------------------------
;           Interrupt Vectors
;------------------------------------------------------------------------------
            ORG     0FFFEh                  ; MSP430 RESET Vector
            DW      RESET                   ;
            ORG     0FFFAh                  ; Timer_B0 Vector
            DW      TB0_ISR                 ;
            END