在使用12MHz晶振的条件下，从T1产生50ms定时，计数从“00”开始，每1s加1，到“59”后，再从“00”开始，完成60s定时工功能-In the use of12MHz crystal condition, derived from the T150ms timing, counting from the"00" begin, each1s plus 1, arrived at the"59", from"00" to complete the function,60s timing