T/C2工作在异步模式下，由PC6(TOSC1)和PC7(TOSC2)外接的32.768KHz 的时钟驱动。T/C2对其1024分频后作为定时时钟。程序计算中断次数。 -T/C2 work in asynchronous mode, by the PC6 (TOSC1) and PC7 (TOSC2) an external clock driver 32.768KHz. T/C2 its frequency after 1024 as a regular clock. Procedure