msp430x42x0_ta_02.s43

来自「该文件包含TI公司MSP430X42X0系列单片机的示例代码。」· S43 代码 · 共 50 行

;******************************************************************************
;   MSP430x42x0 Demo - Timer_A, Toggle P1.0, CCR0 Up Mode ISR, DCO SMCLK
;
;   Description: Toggle P1.0 using software and TA_0 ISR. Timer_A is
;   configured for up mode, thus the timer overflows when TAR counts
;   to CCR0. In this example, CCR0 is loaded with 20000.
;   ACLK = n/a, MCLK = SMCLK = TACLK = default DCO
;
;                 MSP430F4270
;             -----------------
;         /|\|              XIN|-
;          | |                 |
;          --|RST          XOUT|-
;            |                 |
;            |             P1.0|-->LED
;
;  L. Westlund / S. Karthikeyan
;  Texas Instruments Inc.
;  June 2005
;  Built with IAR Embedded Workbench Version: 3.30A
;******************************************************************************
#include  <msp430x42x0.h>
;------------------------------------------------------------------------------
            ORG     08000h                  ; Program Start
;------------------------------------------------------------------------------
RESET       mov.w   #300h,SP                ; Initialize stackpointer
SetupWDT    mov.w   #WDTPW+WDTHOLD,&WDTCTL  ; Stop WDT
SetupP5     bis.b   #001h,&P1DIR            ; P1.0 output
SetupC0     mov.w   #CCIE,&CCTL0            ; CCR0 interrupt enabled
            mov.w   #20000,&CCR0            ;
SetupTA     mov.w   #TASSEL_2+MC_1,&TACTL   ; SMCLK, up mode
                                            ;						
Mainloop    bis.w   #CPUOFF+GIE,SR          ; CPU off, interrupts enabled
            nop                             ; Required for debugger
                                            ;
;-----------------------------------------------------------------------------
TA0_ISR;    Toggle P5.1
;-----------------------------------------------------------------------------
            xor.b   #001h,&P1OUT            ; Toggle P1.0
            reti                            ;		
                                            ;
;-----------------------------------------------------------------------------
;           Interrupt Vectors
;-----------------------------------------------------------------------------
            ORG     0FFFEh                  ; RESET Vector
            DW      RESET                   ;
            ORG     0FFECh                  ; Timer_A0 Vector
            DW      TA0_ISR                 ;
            END