;******************************************************************************* ; MSP320G2xx1 Demo - WDT, Toggle P1.0, Interval Overflow ISR, 32kHz ACLK ; ; Description: Toggle P1.0 using software timed by WDT ISR Toggle rate is ; exactly 250ms based on 32kHz ACLK WDT clock source In this example the ; WDT is configured to divide 32768 watch-crystal(2^15) by 2^13 with an ISR ; triggered @ 4Hz ; ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = DCO ; //* External watch crystal installed on XIN XOUT is required for ACLK *// ; ; MSP430G2xx1 ; ; /|\| XIN|; | | | 32kHz ; |RST XOUT|; | | ; | P1.0| >LED ; ; D Dang ; Texas Instruments Inc ; October 2010 ; Built with Code Composer Essentials Version: 4.2.0 ;******************************************************************************* cdecls C,LIST, "msp430g2231.h" ; -.text ; Program Start ; -RESET mov.w #0280h,SP ; Initialize stackpointer Setup mov.w #WDT_ADLY_250,&WDTCTL ; WDT 250ms, ACLK, interval timer bis.b #WDTIE,&IE1 ; Enable WDT interrupt SetupP1 bis.b #001h,&P1DIR ; P1.0 output ; Mainloop bis.w #LPM3+GIE,SR ; Enter LPM3, interrupts enabled nop ; Required only for debugger ; ; WDT_ISR; Toggle P1.0 ; xor.b #001h,&P1OUT ; Toggle P1.0 reti ; ; ; -; Interrupt Vectors ; -.sect ".reset" ; MSP430 RESET Vector short RESET ; sect ".int10" ; WDT Vector short WDT_ISR ; end