; MSP430F20F3 Demo - SD16, Using the Integrated Temperature Sensor ; ; Description: Use SD16 and it's integrated temperature sensor to detect ; temperature delta.. The temperature sensor
Trang 1; 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
;
;
-; /|\|
XIN|-; | | |
; |RST
XOUT|-; | |
; |A6+ |
; |A6- P1.0| >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 ;
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 ;
;
Trang 2; -; Interrupt Vectors
ORG 0FFFEh ; MSP430 RESET Vector
DW RESET ;
ORG 0FFF4h ; WDT Vector
DW WDT_ISR ;
ORG 0FFEAh ; SD16 Vector
DW SD16_ISR ;
END