一种基于MSP430系列单片机SCM的软件源码实时时钟(RTC)代码码，使用定时器B为中断源，时间变量使用字符型变量储存，便于直接输出数字 -Based on MSP430 MCU SCM software source code for real-time clock (RTC) code, the use of the timer B interrupt source, the time variable character variable to store, easy to dire