MSP430F6733 RTC_C 寄存器不能赋值？？

只看该作者 · 2015-8-27 17:39

1. 在使用 TI MSP430F6733 单片机时 RTC_C 寄存器不能赋值！
下面是TI 提供官方RTC 例程：
#include <msp430.h>

void main(void)
{
WDTCTL = WDTPW | WDTHOLD;             // Stop WTD

// Initialize LFXT1
UCSCTL6 &= ~(XT1OFF);                // Enable XT1
UCSCTL6 |= XCAP_3;                   // Internal load cap

// Loop until XT1, XT2 & DCO fault flag is cleared
do
{
      UCSCTL7 &= ~(XT2OFFG | XT1LFOFFG | DCOFFG);
      // Clear XT2,XT1,DCO fault flags
      SFRIFG1 &= ~OFIFG;                // Clear fault flags
} while (SFRIFG1 & OFIFG);             // Test oscillator fault flag

P1OUT &= ~BIT0;                      // Clear P1.0 output
P1DIR |= BIT0;                         // Set P1.0 as output

// Configure RTC_C
RTCCTL0_H = RTCKEY_H;                // Unlock RTC_C module  问题1: RTCCTL0_H 寄存器写入0xA5不能写入
RTCCTL0_L |= RTCTEVIE | RTCAIE | RTCRDYIE; // Enable RTC time event, alarm event,
                                          // read ready interrupt
RTCCTL1 |= RTCBCD | RTCHOLD;          // RTC enable BCD mode, RTC hold

RTCYEAR = 0x2011;                      // Year = 0x2011 = 2011   问题2: 寄存器写入0x2011不能写入
RTCMON = 0x12;                         // Month = 0x12 = December 问题3:    寄存器写入0x12不能写入
RTCDAY = 0x05;                         // Day = 0x05 = 5th 问题4: 寄存器写入0x05不能写入
RTCDOW = 0x03;                         // Day of week = 0x03 = Wednesday 问题5:   寄存器写入0x03不能写入
RTCHOUR = 0x24;                      // Hour = 0x12  问题6:   寄存器写入0x24不能写入
RTCMIN = 0x59;                         // Minute = 0x57 问题7: 寄存器写入0x59不能写入
RTCSEC = 0x55;                         // Seconds = 0x36 问题8: 寄存器写入0x55不能写入

RTCADOWDAY = 0x3;                      // RTC Day of week alarm = 0x2 问题1:
RTCADAY = 0x22;                      // RTC Day Alarm = 0x22 问题1:
RTCAHOUR = 0x23;                      // RTC Hour Alarm
RTCAMIN = 0x45;                      // RTC Minute Alarm

RTCCTL1 &= ~(RTCHOLD);                // Start RTC calendar mode
RTCCTL0_H = 0;                         // Lock RTC_C module

__bis_SR_register(LPM3_bits | GIE);    // Enter LPM3 w/ interrupts
                                          // enabled
__no_operation();
}