Introduction - If you have any usage issues, please Google them yourself
8051 use an internal timer overlap. In some cases, the two timers in the proceedings are put into use, as from time to time a long time (for example, more than 1min or longer), so that the two overlapping time timer timing, that is, from time to time t0 has not yet been completed, t1 also entered from time to time. If the software can not be handled properly the relationship between the two timer, the program can not continue normal execution.