I am trying to use the external reference output of 1.2V on the MSP430FR2311. Even though I enable the external reference, when I run the program, the EXTREFEN remains at 0 and the reference output on P1.7 remains at 0V.
#include "msp430fr2311.h"
;-------------------------------------------------------------------------------
;-------------------------------------------------------------------------------
ORG 0F100h ; Program Reset
;-------------------------------------------------------------------------------
RESET mov #02400h,SP ; Initialize stackpointer
mov #WDTPW+WDTHOLD,&WDTCTL ; Stop watchdog timer
mov #80h,&SYSCFG2 ; Enable A7 for A/D
mov.b #80h,&P1DIR ; Make P1.7 an output
mov.b #80h,&P1SEL0 ; P1SEL0=P1SEL=1 chooses A7/VREF
mov.b #80h,&P1SEL1
bic.w #LOCKLPM5,PM5CTL0
bis #7h,&ADCMCTL0 ; Not sure I need this
mov #EXTREFEN,&PMMCTL2 ; Enable external reference output
Loop
jmp Loop
ret
;-------------------------------------------------------------------------------
ORG 0FFFEh
DW RESET
END
