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16位 MSP430FR2353 芯片P1.7引脚配置成VREF+输出2.5V 如何配置?

Other Parts Discussed in Thread: MSP430FR2353

16位  MSP430FR2353 芯片P1.7引脚配置成VREF+输出2.5V 如何配置?

下面是我的配置

  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  PM5CTL0 &= ~LOCKLPM5;                     // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings
  P1SEL0 |= BIT7;
  P1SEL1 |= BIT7;
  // Configure reference module
  PMMCTL0_H = PMMPW_H;                                      // Unlock the PMM registers
  PMMCTL2 = INTREFEN | REFVSEL_2 | EXTREFEN_1;              // Enable internal 2.5V reference
  while(!(PMMCTL2 & REFGENRDY));                            // Poll till internal reference settles
,但是测量时仅仅测量出来1.2V 我想输出2.5V 不知道怎么配置下  能否提供下例程