Toggle rate ; is approximately 30ms based on default DCO/SMCLK clock source ; used in this example for the WDT.. Westlund ; Texas Instruments Inc.
Trang 1; MSP430F20xx Demo - WDT, Toggle P1.0, Interval Overflow ISR, DCO SMCLK
;
; Description: Toggle P1.0 using software timed by the WDT ISR Toggle rate
; is approximately 30ms based on default DCO/SMCLK clock source
; used in this example for the WDT
; ACLK = n/a, MCLK = SMCLK = default DCO
;
;
-; /|\|
XIN|-; | | |
; |RST
XOUT|-; | |
; | P1.0| >LED
;
; M Buccini / L Westlund
; Texas Instruments Inc
; September 2005
; Built with IAR Embedded Workbench Version: 3.40A
;*******************************************************************************
#include "msp430x20x3.h"
ORG 0F800h ; Program Reset
; -RESET mov.w #0280h,SP ; Initialize stackpointer
SetupWDT mov.w #WDT_MDLY_32,&WDTCTL ; WDT ~30ms interval timer
bis.b #WDTIE,&IE1 ; Enable WDT interrupt
SetupP1 bis.b #001h,&P1DIR ; P1.0 output
;
Mainloop bis.w #CPUOFF+GIE,SR ; CPU off, enable interrupts
nop ; Required only for debugger
;
; -WDT_ISR; Toggle P1.0
xor.b #001h,&P1OUT ; Toggle P1.0
reti ;
;
; -; Interrupt Vectors
ORG 0FFFEh ; MSP430 RESET Vector
DW RESET ;
ORG 0FFF4h ; WDT Vector
DW WDT_ISR ;
END