;******************************************************************************* ; MSP430F20F3 Demo - SD16, Using the Integrated Temperature Sensor ; ; Description: Use SD16 and it's integrated temperature sensor to detect ; temperature delta The temperature sensor output voltage is sampled ; ~ every 240ms and compared with the last value and if more than ~0.5C ; delta, P1.0 is set, else reset ; SD16 Internal VRef, Bipolar offset binary output format used ; Watchdog used as interval time and ISR used to start next SD16 conversion ; ACLK = n/a, MCLK = default DCO, SMCLK = SD16CLK = default DCO/8 ; ; MSP430F20xx ; ; /|\| XIN|; | | | ; |RST XOUT|; | | ; |A6+ | ; |A6P1.0| >LED ; ; ; M Buccini / L Westlund ; Texas Instruments Inc ; October 2005 ; Built with IAR Embedded Workbench Version: 3.40A ;******************************************************************************* ADCDeltaOn EQU 31 ; ~ 0.5 Deg C delta for LED on ; CPU Registers Used #define LastADCVal R4 #include "msp430x20x3.h" ; ORG 0F800h ; Program Reset ; RESET mov.w #0280h,SP ; Initialize stackpointer bis.b #DIVS_3,&BCSCTL2 ; SMCLK/8 SetupWDT mov.w #WDT_MDLY_32,&WDTCTL ; WDT Timer interval bis.b #WDTIE,&IE1 ; Enable WDT interrupt SetupP1 bis.b #001h,&P1DIR ; P1.0 output SetupSD16 mov.w #SD16REFON+SD16SSEL_1,&SD16CTL ; 1.2V ref, SMCLK mov.b #SD16INCH_6,&SD16INCTL0 ; A6+/mov.w #SD16SNGL+SD16IE,&SD16CCTL0 ; Single conv, interrupt ; Mainloop bis.w #CPUOFF+GIE,SR ; CPU off, enable interrupts nop ; Required only for debugger ; ; SD16_ISR; ; add.w #ADCDeltaOn,LastADCVal ; bic.b #01h,&P1OUT ; LED off cmp.w LastADCVal,&SD16MEM0 ; Clears IFG jlo SD16_ISR_1 ; bis.b #01h,&P1OUT ; LED on SD16_ISR_1 mov.w &SD16MEM0,LastADCVal ; Store value reti ; ; ; WDT_ISR; ; bis.w #SD16SC,&SD16CCTL0 ; Start conversion reti ; ; ; ; Interrupt Vectors ; ORG 0FFFEh ; MSP430 RESET Vector DW RESET ; ORG 0FFF4h ; WDT Vector DW WDT_ISR ; ORG 0FFEAh ; SD16 Vector DW SD16_ISR ; END